About this index & how it's been checked

The Aging Vulnerability Index (AVI) is this platform's own construction, modeled on the CDC/ATSDR Social Vulnerability Index methodology but not a CDC product and not independently validated. It combines Census ACS data on the population 65 and older — demographic aging pressure, economic precarity, health/disability/isolation, and housing/transportation burden — into a single percentile ranking of U.S. counties. The underlying inputs are official Census data; the index construction and weighting are this platform's own.

Reference-county check

A face-validity check against real counties with well-documented age profiles — the same method used to calibrate this platform's seasonal-community threshold. Higher percentile = more aging-vulnerable.

  • ✓ Sumter County, FL — 79.8th percentile (expected HIGH, The Villages — often cited as the oldest-median-age U.S. county)
  • ✓ Charlotte County, FL — 90.8th percentile (expected HIGH, Retirement destination)
  • ✓ Citrus County, FL — 88.1th percentile (expected HIGH, Retirement destination)
  • ✓ Highlands County, FL — 95.9th percentile (expected HIGH, Retirement destination)
  • ✓ Brazos County, TX — 17.0th percentile (expected LOW, Texas A&M)
  • ✓ Story County, IA — 8.9th percentile (expected LOW, Iowa State)
  • ✓ Whitman County, WA — 10.3th percentile (expected LOW, Washington State University)
  • ✓ Tompkins County, NY — 7.6th percentile (expected LOW, Cornell)

Highest / lowest AVI by county population

Under 50,000

Highest
  1. Catron County, NM — 100.0th pctile (pop. 3,743)
  2. De Baca County, NM — 99.9th pctile (pop. 1,576)
  3. Ozark County, MO — 99.8th pctile (pop. 8,873)
  4. Scott County, VA — 99.6th pctile (pop. 21,479)
  5. Harney County, OR — 99.6th pctile (pop. 7,499)
Lowest
  1. Martin County, TX — 0.0th pctile (pop. 5,218)
  2. Jim Hogg County, TX — 0.1th pctile (pop. 4,727)
  3. Haskell County, KS — 0.1th pctile (pop. 3,641)
  4. Hanson County, SD — 0.1th pctile (pop. 3,472)
  5. Trousdale County, TN — 0.2th pctile (pop. 11,957)

50,000-99,999

Highest
  1. Nye County, NV — 96.7th pctile (pop. 54,344)
  2. Gila County, AZ — 96.7th pctile (pop. 53,795)
  3. Raleigh County, WV — 96.0th pctile (pop. 73,195)
  4. Wilkes County, NC — 95.6th pctile (pop. 65,935)
  5. Pittsylvania County, VA — 94.0th pctile (pop. 59,856)
Lowest
  1. Oldham County, KY — 0.0th pctile (pop. 69,257)
  2. Eagle County, CO — 0.2th pctile (pop. 55,135)
  3. Lincoln County, SD — 0.5th pctile (pop. 70,638)
  4. Johnson County, MO — 0.9th pctile (pop. 54,732)
  5. Lafayette County, MS — 1.3th pctile (pop. 58,327)

100,000-299,999

Highest
  1. Highlands County, FL — 95.9th pctile (pop. 105,702)
  2. Mohave County, AZ — 93.9th pctile (pop. 220,517)
  3. Douglas County, OR — 93.0th pctile (pop. 112,072)
  4. Charlotte County, FL — 90.8th pctile (pop. 201,064)
  5. Indian River County, FL — 90.3th pctile (pop. 166,936)
Lowest
  1. Union County, NC — 0.8th pctile (pop. 250,958)
  2. Scott County, MN — 1.1th pctile (pop. 154,557)
  3. Williamson County, TN — 1.2th pctile (pop. 260,351)
  4. St. Mary's County, MD — 1.3th pctile (pop. 115,126)
  5. Dallas County, IA — 1.5th pctile (pop. 107,968)

300,000 and higher

Highest
  1. Pinellas County, FL — 90.1th pctile (pop. 963,481)
  2. Collier County, FL — 89.9th pctile (pop. 398,291)
  3. Marion County, FL — 87.1th pctile (pop. 400,078)
  4. Lee County, FL — 86.1th pctile (pop. 817,666)
  5. Palm Beach County, FL — 85.0th pctile (pop. 1,533,806)
Lowest
  1. Hamilton County, IN — 0.6th pctile (pop. 365,056)
  2. Prince William Count, VA — 2.1th pctile (pop. 488,880)
  3. Davis County, UT — 2.1th pctile (pop. 370,924)
  4. Douglas County, CO — 2.2th pctile (pop. 377,150)
  5. Loudoun County, VA — 2.4th pctile (pop. 432,998)
Compare
NationallyWithin its state

Clayton County — Aging Vulnerability Index by county subdivision

Candidate index, not validated against ground truth — 2020–2024 ACS 5-year
Clayton County — Aging Vulnerability Index by county subdivision
Boardman township — 81 (Upper-middle)Buena Vista township — 16 (Lower-middle)Cass township — 96 (Higher)Clayton township — 59 (Middle)Cox Creek township — 73 (Upper-middle)Elk township — 5 (Lower)Farmersburg township — 55 (Middle)Garnavillo township — 96 (Higher)Giard township — 71 (Upper-middle)Grand Meadow township — 30 (Lower-middle)Highland township — no data (unmeasured)Jefferson township — 96 (Higher)Lodomillo township — 32 (Lower-middle)Mallory township — 1 (Lower)Marion township — 24 (Lower-middle)Mendon township — 97 (Higher)Millville township — 2 (Lower)Monona township — 73 (Upper-middle)Read township — 15 (Lower)Sperry township — 83 (Higher)Volga township — 50 (Middle)Wagner township — 57 (Middle)
Where this is
Shading: Aging Vulnerability Index
Lower (1 to 15)Lower-middle (16 to 32)Middle (50 to 59)Upper-middle (71 to 81)Higher (83 to 97)No data
Each unit is shaded by its Aging Vulnerability Index 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 county subdivision to see its overall percentile and theme scores.

← Back to county view
Median county subdivision: 57th percentile (among all U.S. county subdivisions).
These county subdivisions span the 1st percentile to the 97th percentile. The width of that range is the internal disparity.
Well above the median6 (29%)
Above the median3 (14%)
Near the median4 (19%)
Below the median3 (14%)
Well below the median5 (24%)
Widest spread across these county subdivisions: Housing & Transportation, 65+ — this theme most separates the higher- and lower-ranked county subdivisions here.
AVI ranks each county subdivision'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.
Mendon township — 97th percentile — Well above the median 5 of 12 flagged
Driven by Demographic Aging Pressure (well above), Housing & Transportation, 65+ ‡ (well above) and Social Isolation ‡ (well above); near the median on Health, Disability & Isolation ‡; below the median on Economic Precarity, 65+ ‡.
‡ theme includes at least one flagged input.
Garnavillo township — 96th percentile — Well above the median 5 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above), Health, Disability & Isolation ‡ (well above) and Social Isolation (well above); near the median on Economic Precarity, 65+ ‡; below the median on Housing & Transportation, 65+ ‡.
‡ theme includes at least one flagged input.
Jefferson township — 96th percentile — Well above the median 5 of 12 flagged
Driven by Demographic Aging Pressure (well above), Economic Precarity, 65+ ‡ (above), Housing & Transportation, 65+ ‡ (well above) and Social Isolation ‡ (well above); near the median on Health, Disability & Isolation ‡.
‡ theme includes at least one flagged input.
Cass township — 96th percentile — Well above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above), Economic Precarity, 65+ ‡ (above), Housing & Transportation, 65+ ‡ (well above) and Social Isolation ‡ (above); near the median on Health, Disability & Isolation ‡.
‡ theme includes at least one flagged input.
Sperry township — 83rd percentile — Well above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Social Isolation ‡ (well above); near the median on Health, Disability & Isolation ‡; below the median on Economic Precarity, 65+ ‡ and Housing & Transportation, 65+ ‡.
‡ theme includes at least one flagged input.
Boardman township — 81st percentile — Well above the median 4 of 12 flagged
Driven by Demographic Aging Pressure (above), Housing & Transportation, 65+ ‡ (above) and Social Isolation (well above); near the median on Health, Disability & Isolation ‡; below the median on Economic Precarity, 65+ ‡.
‡ theme includes at least one flagged input.
Monona township — 73rd percentile — Above the median 4 of 12 flagged
Driven by Demographic Aging Pressure (above), Housing & Transportation, 65+ ‡ (well above) and Social Isolation (well above); below the median on Economic Precarity, 65+ ‡ and Health, Disability & Isolation ‡.
‡ theme includes at least one flagged input.
Cox Creek township — 73rd percentile — Above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above), Health, Disability & Isolation ‡ (above) and Social Isolation ‡ (above); below the median on Economic Precarity, 65+ and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Giard township — 71st percentile — Above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above), Economic Precarity, 65+ ‡ (well above) and Social Isolation ‡ (above); below the median on Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Clayton township — 59th percentile — Near the median 8 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above), Economic Precarity, 65+ ‡ (above) and Health, Disability & Isolation ‡ (above); near the median on Social Isolation ‡; below the median on Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Wagner township — 57th percentile — Near the median 8 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Health, Disability & Isolation ‡ (above); below the median on Economic Precarity, 65+ ‡, Housing & Transportation, 65+ ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Farmersburg township — 55th percentile — Near the median 7 of 12 flagged
Driven by Economic Precarity, 65+ ‡ (above) and Social Isolation ‡ (above); near the median on Demographic Aging Pressure ‡ and Housing & Transportation, 65+ ‡; below the median on Health, Disability & Isolation ‡.
‡ theme includes at least one flagged input.
Volga township — 50th percentile — Near the median 9 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (well above); near the median on Economic Precarity, 65+ ‡, Health, Disability & Isolation ‡ and Social Isolation ‡; below the median on Demographic Aging Pressure ‡.
‡ theme includes at least one flagged input.
Lodomillo township — 32nd percentile — Below the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above); near the median on Economic Precarity, 65+ ‡ and Housing & Transportation, 65+ ‡; below the median on Health, Disability & Isolation and Social Isolation ‡.
‡ theme includes at least one flagged input.
Grand Meadow township — 30th percentile — Below the median 7 of 12 flagged
Driven by Economic Precarity, 65+ ‡ (above) and Social Isolation ‡ (above); near the median on Housing & Transportation, 65+ ‡; below the median on Demographic Aging Pressure ‡ and Health, Disability & Isolation.
‡ theme includes at least one flagged input.
Marion township — 24th percentile — Below the median 4 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above) and Economic Precarity, 65+ ‡ (above); below the median on Health, Disability & Isolation, Housing & Transportation, 65+ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Buena Vista township — 16th percentile — Well below the median 6 of 12 flagged
Near the median on Economic Precarity, 65+ ‡ and Social Isolation ‡; below the median on Demographic Aging Pressure ‡, Health, Disability & Isolation and Housing & Transportation, 65+ ‡.
‡ theme includes at least one flagged input.
Read township — 15th percentile — Well below the median 5 of 12 flagged
Driven by Economic Precarity, 65+ ‡ (above) and Social Isolation ‡ (well above); below the median on Demographic Aging Pressure ‡, Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Elk township — 5th percentile — Well below the median 6 of 12 flagged
Driven by Social Isolation ‡ (above); near the median on Housing & Transportation, 65+ ‡; below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ and Health, Disability & Isolation.
‡ theme includes at least one flagged input.
Millville township — 2nd percentile — Well below the median 6 of 12 flagged
Driven by Economic Precarity, 65+ ‡ (well above); below the median on Demographic Aging Pressure ‡, Health, Disability & Isolation, Housing & Transportation, 65+ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Mallory township — 1st percentile — Well below the median 6 of 12 flagged
Below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ ‡, Health, Disability & Isolation, Housing & Transportation, 65+ and Social Isolation ‡.
‡ theme includes at least one flagged input.
1 county unranked — insufficient data
These carry no percentile. Excluded from the bands, median and range above, and never shown as a low score.
AVI = a candidate Aging Vulnerability Index, computed by this platform from American Community Survey 2020–2024 5-year estimates, following the same method shape (percentile rank -> theme sum -> re-rank -> overall) as the CDC/ATSDR SVI this platform also recomputes — but AVI itself has no published ground truth to validate against. It is a first-cut, directional design. Percentiles rank each county against all U.S. county subdivisions.
Several of AVI's 12 input signals carry a documented high margin of error at this grain (most notably lack of health insurance, 65+) and are kept in the index with a flag rather than dropped, to preserve variable coverage. A county's flag count (shown per-county above) is a direct measure of how much its rank should be read as directional rather than precise.

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