Social Vulnerability Index Recalculation

The Social Vulnerability Index Recalculation is based on the important work of the federal Centers for Disease Control. With the future of that index in doubt, the same federal datasets and methodologies were used to carry the index forward.

The most recent SVI uses the 2022 American Communities Survey as its base. This recalculation matches the 2022 baseline 100 percent. The 2022 methodologies form the basis of the updated calculations for subsequent ACS vintages. This platform will run updates on all new ACS releases.

Should the SVI be updated with changed methodologies, this platform will update to match, while preserving the 2022 methodologies for comparison purposes.

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Mercer County — Social Vulnerability Index

Unofficial CDC-method recomputation, 2020–2024 ACS 5-year
Mercer County — Social Vulnerability Index by census tract
Tract 1.00 — 98 (Higher)Tract 2.00 — 96 (Higher)Tract 3.00 — 67 (Middle)Tract 4.00 — 88 (Higher)Tract 5.00 — 86 (Higher)Tract 6.00 — 68 (Middle)Tract 7.00 — 93 (Higher)Tract 8.00 — 82 (Higher)Tract 9.00 — 97 (Higher)Tract 10.00 — 99 (Higher)Tract 11.01 — 89 (Higher)Tract 11.02 — 99 (Higher)Tract 12.00 — 75 (Upper-middle)Tract 13.00 — 81 (Upper-middle)Tract 14.01 — 96 (Higher)Tract 14.02 — 76 (Upper-middle)Tract 15.00 — 68 (Upper-middle)Tract 16.00 — 86 (Higher)Tract 17.00 — 90 (Higher)Tract 18.00 — 89 (Higher)Tract 19.00 — 80 (Upper-middle)Tract 20.00 — 95 (Higher)Tract 21.00 — 99 (Higher)Tract 22.00 — 90 (Higher)Tract 25.00 — 76 (Upper-middle)Tract 26.01 — 63 (Middle)Tract 26.02 — 71 (Upper-middle)Tract 27.01 — 82 (Upper-middle)Tract 27.02 — 80 (Upper-middle)Tract 28.00 — 60 (Middle)Tract 29.02 — 73 (Upper-middle)Tract 29.03 — 28 (Lower-middle)Tract 29.04 — 10 (Lower)Tract 30.01 — 16 (Lower-middle)Tract 30.02 — 28 (Lower-middle)Tract 30.03 — 59 (Middle)Tract 30.04 — 22 (Lower-middle)Tract 30.06 — 5 (Lower)Tract 30.07 — 5 (Lower)Tract 30.08 — 26 (Lower-middle)Tract 30.09 — 68 (Upper-middle)Tract 31.00 — 72 (Upper-middle)Tract 32.01 — 61 (Middle)Tract 32.02 — 32 (Lower-middle)Tract 33.01 — 22 (Lower-middle)Tract 33.03 — 21 (Lower-middle)Tract 33.04 — 12 (Lower)Tract 34.00 — 57 (Middle)Tract 35.00 — 78 (Upper-middle)Tract 36.01 — 68 (Middle)Tract 36.02 — 70 (Upper-middle)Tract 37.03 — 33 (Lower-middle)Tract 37.04 — 11 (Lower)Tract 37.06 — 12 (Lower)Tract 37.07 — 77 (Upper-middle)Tract 37.08 — 51 (Middle)Tract 38.00 — 16 (Lower-middle)Tract 39.02 — 2 (Lower)Tract 39.03 — 19 (Lower-middle)Tract 39.04 — 14 (Lower)Tract 39.05 — 2 (Lower)Tract 40.00 — 34 (Lower-middle)Tract 42.03 — 51 (Middle)Tract 42.04 — 15 (Lower)Tract 42.05 — 30 (Lower-middle)Tract 42.06 — 23 (Lower-middle)Tract 43.06 — 5 (Lower)Tract 43.07 — 14 (Lower)Tract 43.09 — 13 (Lower)Tract 43.11 — 48 (Middle)Tract 43.12 — 13 (Lower)Tract 43.13 — 58 (Middle)Tract 43.14 — 38 (Lower-middle)Tract 43.15 — 2 (Lower)Tract 43.16 — 14 (Lower)Tract 44.03 — 49 (Middle)Tract 44.04 — 48 (Middle)Tract 44.06 — 58 (Middle)Tract 44.07 — 69 (Upper-middle)Tract 44.08 — 54 (Middle)Tract 44.09 — 71 (Upper-middle)Tract 45.01 — 19 (Lower-middle)Tract 45.02 — 34 (Lower-middle)Tract 9800.00 — no data (unmeasured)
Where this is
Shading: Overall SVI Percentile
Lower (2 to 15)Lower-middle (16 to 38)Middle (48 to 68)Upper-middle (68 to 82)Higher (82 to 99)No data
Each unit is shaded by its Overall SVI Percentile value and grouped into equal-count bands (quantiles) against the other units shown — lighter = lower, darker = higher. It ranks position among the units in view; it does not grade places, and the ranges shift with which units are shown.

The map is bounded to this parent geography — it shows the selected unit among its own siblings only, the same depth rule the drill-down uses. Shading ranks position on the measure among the units shown; it does not grade places.

Click a tract to see its overall percentile and theme scores.

Median tract: 58th percentile (among all U.S. tracts).
These tracts span the 2nd percentile to the 99th percentile. The width of that range is the internal disparity.
Well above the median20 (24%) · 75,975 people
Above the median19 (23%) · 92,753 people
Near the median11 (13%) · 61,011 people
Below the median13 (16%) · 66,162 people
Well below the median20 (24%) · 89,166 people
Widest spread across these tracts: Housing Type & Transportation — this theme most separates the higher- and lower-ranked tracts here.

The SVI ranks each tract's position relative to a comparison set; it is not averaged into one number for the area, because percentiles do not average meaningfully. The distribution — median, range, and shape below — is the summary.
Well above the median — 20 tracts (80th–100th percentile)
Tract 10.00 (pop. 3,238) — 99th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (well above).
Tract 11.02 (pop. 3,809) — 99th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (well above).
Tract 21.00 (pop. 6,310) — 99th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (well above).
Tract 1.00 (pop. 3,543) — 98th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (well above); near the median on Housing Type & Transportation.
Tract 9.00 (pop. 4,428) — 97th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (well above).
Tract 14.01 (pop. 3,612) — 96th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (above).
Tract 2.00 (pop. 3,584) — 96th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above).
Tract 20.00 (pop. 1,356) — 95th percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (well above).
Tract 7.00 (pop. 3,976) — 93rd percentile — Well above the median CDC-based flag ≥ 90th percentile
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (above).
Tract 17.00 (pop. 3,910) — 90th percentile — Well above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (well above); near the median on Housing Type & Transportation.
Tract 22.00 (pop. 6,278) — 90th percentile — Well above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (well above); near the median on Housing Type & Transportation.
Tract 18.00 (pop. 4,178) — 89th percentile — Well above the median
Driven by Socioeconomic Status (well above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); near the median on Household Characteristics.
Tract 11.01 (pop. 2,163) — 89th percentile — Well above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (above).
Tract 4.00 (pop. 6,392) — 88th percentile — Well above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (well above); near the median on Housing Type & Transportation.
Tract 5.00 (pop. 6,052) — 86th percentile — Well above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (well above); below the median on Housing Type & Transportation.
Tract 16.00 (pop. 1,333) — 86th percentile — Well above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (well above); near the median on Housing Type & Transportation.
Tract 8.00 (pop. 2,399) — 82nd percentile — Well above the median
Driven by Socioeconomic Status (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (well above); below the median on Household Characteristics.
Tract 27.01 (pop. 4,565) — 82nd percentile — Well above the median
Driven by Socioeconomic Status (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (above); below the median on Household Characteristics.
Tract 13.00 (pop. 3,538) — 81st percentile — Well above the median
Driven by Socioeconomic Status (above), Household Characteristics (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (above).
Tract 19.00 (pop. 1,311) — 80th percentile — Well above the median
Driven by Socioeconomic Status (well above) and Racial & Ethnic Minority Status (well above); below the median on Household Characteristics and Housing Type & Transportation.
Above the median — 19 tracts (60th–80th percentile)
Tract 27.02 (pop. 7,022) — 80th percentile — Above the median
Driven by Socioeconomic Status (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); near the median on Household Characteristics.
Tract 35.00 (pop. 6,494) — 78th percentile — Above the median
Driven by Household Characteristics (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); near the median on Socioeconomic Status.
Tract 37.07 (pop. 1,842) — 77th percentile — Above the median
Driven by Household Characteristics (above) and Housing Type & Transportation (well above); near the median on Socioeconomic Status and Racial & Ethnic Minority Status.
Tract 25.00 (pop. 8,747) — 76th percentile — Above the median
Driven by Socioeconomic Status (above), Household Characteristics (well above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (above).
Tract 14.02 (pop. 1,567) — 76th percentile — Above the median
Driven by Socioeconomic Status (well above), Household Characteristics (well above) and Racial & Ethnic Minority Status (well above); below the median on Housing Type & Transportation.
Tract 12.00 (pop. 3,830) — 75th percentile — Above the median
Driven by Socioeconomic Status (above), Household Characteristics (above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (above).
Tract 29.02 (pop. 5,404) — 73rd percentile — Above the median
Driven by Socioeconomic Status (above), Household Characteristics (well above) and Racial & Ethnic Minority Status (above); below the median on Housing Type & Transportation.
Tract 31.00 (pop. 4,276) — 72nd percentile — Above the median
Driven by Socioeconomic Status (above), Household Characteristics (well above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (above).
Tract 44.09 (pop. 3,686) — 71st percentile — Above the median
Driven by Socioeconomic Status (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (above); near the median on Household Characteristics.
Tract 26.02 (pop. 4,744) — 71st percentile — Above the median
Driven by Socioeconomic Status (above), Household Characteristics (well above) and Racial & Ethnic Minority Status (above); near the median on Housing Type & Transportation.
Tract 36.02 (pop. 2,380) — 70th percentile — Above the median
Driven by Socioeconomic Status (above) and Racial & Ethnic Minority Status (above); near the median on Household Characteristics and Housing Type & Transportation.
Tract 44.07 (pop. 7,505) — 69th percentile — Above the median
Driven by Household Characteristics (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (above); near the median on Socioeconomic Status.
Tract 15.00 (pop. 2,727) — 68th percentile — Above the median
Driven by Household Characteristics (well above), Racial & Ethnic Minority Status (well above) and Housing Type & Transportation (above); below the median on Socioeconomic Status.
Tract 30.09 (pop. 5,670) — 68th percentile — Above the median
Driven by Socioeconomic Status (above), Household Characteristics (above) and Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status.
Tract 6.00 (pop. 5,288) — 68th percentile — Above the median
Driven by Socioeconomic Status (well above), Household Characteristics (above) and Racial & Ethnic Minority Status (well above); below the median on Housing Type & Transportation.
Tract 36.01 (pop. 3,761) — 68th percentile — Above the median
Driven by Socioeconomic Status (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (above); near the median on Household Characteristics.
Tract 3.00 (pop. 4,719) — 67th percentile — Above the median
Driven by Socioeconomic Status (well above), Household Characteristics (above) and Racial & Ethnic Minority Status (well above); below the median on Housing Type & Transportation.
Tract 26.01 (pop. 4,936) — 63rd percentile — Above the median
Driven by Socioeconomic Status (above), Household Characteristics (above) and Racial & Ethnic Minority Status (well above); below the median on Housing Type & Transportation.
Tract 32.01 (pop. 8,155) — 61st percentile — Above the median
Driven by Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); near the median on Socioeconomic Status; below the median on Household Characteristics.
Near the median — 11 tracts (40th–60th percentile)
Tract 28.00 (pop. 6,655) — 60th percentile — Near the median
Driven by Socioeconomic Status (above), Household Characteristics (above) and Racial & Ethnic Minority Status (well above); below the median on Housing Type & Transportation.
Tract 30.03 (pop. 5,665) — 59th percentile — Near the median
Driven by Household Characteristics (above); near the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 43.13 (pop. 5,327) — 58th percentile — Near the median
Driven by Household Characteristics (above) and Racial & Ethnic Minority Status (well above); near the median on Socioeconomic Status; below the median on Housing Type & Transportation.
Tract 44.06 (pop. 5,182) — 58th percentile — Near the median
Driven by Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); near the median on Household Characteristics; below the median on Socioeconomic Status.
Tract 34.00 (pop. 2,903) — 57th percentile — Near the median
Driven by Socioeconomic Status (well above) and Racial & Ethnic Minority Status (well above); near the median on Household Characteristics; below the median on Housing Type & Transportation.
Tract 44.08 (pop. 5,307) — 54th percentile — Near the median
Driven by Racial & Ethnic Minority Status (above) and Housing Type & Transportation (above); near the median on Household Characteristics; below the median on Socioeconomic Status.
Tract 42.03 (pop. 3,532) — 51st percentile — Near the median
Driven by Household Characteristics (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); below the median on Socioeconomic Status.
Tract 37.08 (pop. 4,567) — 51st percentile — Near the median
Driven by Housing Type & Transportation (well above); near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Household Characteristics.
Tract 44.03 (pop. 5,920) — 49th percentile — Near the median
Driven by Housing Type & Transportation (above); near the median on Socioeconomic Status and Racial & Ethnic Minority Status; below the median on Household Characteristics.
Tract 44.04 (pop. 8,382) — 48th percentile — Near the median
Driven by Racial & Ethnic Minority Status (above); near the median on Socioeconomic Status and Housing Type & Transportation; below the median on Household Characteristics.
Tract 43.11 (pop. 7,571) — 48th percentile — Near the median
Driven by Racial & Ethnic Minority Status (above) and Housing Type & Transportation (above); below the median on Socioeconomic Status and Household Characteristics.
Below the median — 13 tracts (20th–40th percentile)
Tract 43.14 (pop. 5,865) — 38th percentile — Below the median
Driven by Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); below the median on Socioeconomic Status and Household Characteristics.
Tract 45.02 (pop. 1,021) — 34th percentile — Below the median
Driven by Household Characteristics (well above); below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 40.00 (pop. 5,705) — 34th percentile — Below the median
Driven by Housing Type & Transportation (well above); near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Household Characteristics.
Tract 37.03 (pop. 7,076) — 33rd percentile — Below the median
Near the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation; below the median on Household Characteristics.
Tract 32.02 (pop. 5,224) — 32nd percentile — Below the median
Driven by Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Household Characteristics.
Tract 42.05 (pop. 5,357) — 30th percentile — Below the median
Near the median on Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation; below the median on Socioeconomic Status.
Tract 29.03 (pop. 3,871) — 28th percentile — Below the median
Driven by Household Characteristics (above); near the median on Racial & Ethnic Minority Status and Housing Type & Transportation; below the median on Socioeconomic Status.
Tract 30.02 (pop. 5,852) — 28th percentile — Below the median
Near the median on Household Characteristics and Housing Type & Transportation; below the median on Socioeconomic Status and Racial & Ethnic Minority Status.
Tract 30.08 (pop. 5,342) — 26th percentile — Below the median
Near the median on Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation; below the median on Socioeconomic Status.
Tract 42.06 (pop. 2,401) — 23rd percentile — Below the median
Driven by Household Characteristics (well above); near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Housing Type & Transportation.
Tract 30.04 (pop. 5,607) — 22nd percentile — Below the median
Driven by Household Characteristics (above); below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 33.01 (pop. 7,385) — 22nd percentile — Below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 33.03 (pop. 5,456) — 21st percentile — Below the median
Driven by Racial & Ethnic Minority Status (above); below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Well below the median — 20 tracts (0th–20th percentile)
Tract 45.01 (pop. 6,678) — 19th percentile — Well below the median
Driven by Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); below the median on Socioeconomic Status and Household Characteristics.
Tract 39.03 (pop. 2,827) — 19th percentile — Well below the median
Near the median on Household Characteristics and Housing Type & Transportation; below the median on Socioeconomic Status and Racial & Ethnic Minority Status.
Tract 38.00 (pop. 6,999) — 16th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 30.01 (pop. 5,852) — 16th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 42.04 (pop. 6,062) — 15th percentile — Well below the median
Driven by Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Household Characteristics.
Tract 43.16 (pop. 4,461) — 14th percentile — Well below the median
Driven by Racial & Ethnic Minority Status (above); below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 39.04 (pop. 5,951) — 14th percentile — Well below the median
Near the median on Household Characteristics and Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Housing Type & Transportation.
Tract 43.07 (pop. 6,690) — 14th percentile — Well below the median
Driven by Racial & Ethnic Minority Status (above); below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 43.09 (pop. 4,618) — 13th percentile — Well below the median
Driven by Racial & Ethnic Minority Status (above); near the median on Housing Type & Transportation; below the median on Socioeconomic Status and Household Characteristics.
Tract 43.12 (pop. 3,452) — 13th percentile — Well below the median
Near the median on Household Characteristics and Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Housing Type & Transportation.
Tract 33.04 (pop. 1,817) — 12th percentile — Well below the median
Near the median on Household Characteristics and Racial & Ethnic Minority Status; below the median on Socioeconomic Status and Housing Type & Transportation.
Tract 37.06 (pop. 3,996) — 12th percentile — Well below the median
Near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 37.04 (pop. 2,585) — 11th percentile — Well below the median
Near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 29.04 (pop. 4,717) — 10th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 30.06 (pop. 4,956) — 5th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 30.07 (pop. 2,901) — 5th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 43.06 (pop. 4,924) — 5th percentile — Well below the median
Driven by Racial & Ethnic Minority Status (above); below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 39.02 (pop. 1,823) — 2nd percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 39.05 (pop. 4,645) — 2nd percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 43.15 (pop. 3,212) — 2nd percentile — Well below the median
Driven by Racial & Ethnic Minority Status (above); below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
1 tract unranked — no population or suppressed
These carry no percentile (zero-population or suppressed data, typically water and special-use tracts). They are excluded from the bands, median and range above, and are never shown as a low score.
SVI = the CDC/ATSDR Social Vulnerability Index, recomputed by this platform from American Community Survey 2020–2024 5-year estimates using CDC's published method. Percentiles rank each tract against all U.S. tracts. "Vulnerability" is the name of CDC's index; the platform reports where a place ranks on it, and does not grade places or their residents.
Top-decile flags follow CDC's own convention (≥ 90th percentile) and are attributed as such; they are not part of an official CDC distribution.

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