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

Oakland County — Aging Vulnerability Index by county subdivision

Candidate index, not validated against ground truth — 2020–2024 ACS 5-year
Oakland County — Aging Vulnerability Index by county subdivision
Addison township — 25 (Lower)Auburn Hills — 47 (Middle)Berkley — 15 (Lower)Birmingham — 41 (Middle)Bloomfield charter township — 75 (Higher)Bloomfield Hills — 87 (Higher)Brandon charter township — 25 (Lower-middle)Clawson — 44 (Middle)Commerce charter township — 52 (Upper-middle)Farmington — 46 (Middle)Farmington Hills — 81 (Higher)Fenton — no data (unmeasured)Ferndale — 27 (Lower-middle)Groveland township — 23 (Lower)Hazel Park — 41 (Middle)Highland charter township — 47 (Middle)Holly township — 63 (Upper-middle)Huntington Woods — 6 (Lower)Independence charter township — 41 (Middle)Keego Harbor — 94 (Higher)Lake Angelus — 59 (Upper-middle)Lathrup Village — 36 (Lower-middle)Lyon charter township — 19 (Lower)Madison Heights — 89 (Higher)Milford charter township — 46 (Middle)Northville — 19 (Lower)Novi — 55 (Upper-middle)Novi township — 5 (Lower)Oakland charter township — 17 (Lower)Oak Park — 68 (Upper-middle)Orchard Lake Village — 30 (Lower-middle)Orion charter township — 55 (Upper-middle)Oxford charter township — 38 (Lower-middle)Pleasant Ridge — 8 (Lower)Pontiac — 78 (Higher)Rochester — 35 (Lower-middle)Rochester Hills — 54 (Upper-middle)Rose township — 72 (Higher)Royal Oak — 39 (Lower-middle)Royal Oak charter township — 49 (Upper-middle)Southfield — 86 (Higher)Southfield township — 81 (Higher)South Lyon — 38 (Lower-middle)Springfield charter township — 39 (Middle)Sylvan Lake — 32 (Lower-middle)Troy — 48 (Middle)Village of Clarkston — 53 (Upper-middle)Walled Lake — 37 (Lower-middle)Waterford charter township — 72 (Higher)West Bloomfield charter township — 87 (Higher)White Lake charter township — 54 (Upper-middle)Wixom — 14 (Lower)
Where this is
Shading: Aging Vulnerability Index
Lower (5 to 25)Lower-middle (25 to 39)Middle (39 to 48)Upper-middle (49 to 68)Higher (72 to 94)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: 46th percentile (among all U.S. county subdivisions).
These county subdivisions span the 5th percentile to the 94th percentile. The width of that range is the internal disparity.
Well above the median7 (14%)
Above the median6 (12%)
Near the median17 (33%)
Below the median13 (25%)
Well below the median8 (16%)
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.
Well above the median — 7 counties (80th–100th percentile)
Keego Harbor — 94th percentile — Well above the median 8 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above), Economic Precarity, 65+ ‡ (well 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.
Madison Heights — 89th percentile — Well above the median 1 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above), Housing & Transportation, 65+ (well above) and Social Isolation (above); near the median on Demographic Aging Pressure and Economic Precarity, 65+.
‡ theme includes at least one flagged input.
West Bloomfield charter township — 87th percentile — Well above the median
Driven by Demographic Aging Pressure (well above), Health, Disability & Isolation (well above) and Housing & Transportation, 65+ (above); near the median on Economic Precarity, 65+; below the median on Social Isolation.
Bloomfield Hills — 87th percentile — Well above the median 5 of 12 flagged
Driven by Demographic Aging Pressure (well above), Housing & Transportation, 65+ ‡ (well above) and Social Isolation ‡ (above); below the median on Economic Precarity, 65+ ‡ and Health, Disability & Isolation ‡.
‡ theme includes at least one flagged input.
Southfield — 86th percentile — Well above the median 1 of 12 flagged
Driven by Demographic Aging Pressure (above), Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ (well above); near the median on Economic Precarity, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Farmington Hills — 81st percentile — Well above the median 1 of 12 flagged
Driven by Demographic Aging Pressure (above), Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ (above); near the median on Economic Precarity, 65+; below the median on Social Isolation.
‡ theme includes at least one flagged input.
Southfield township — 81st percentile — Well above the median 6 of 12 flagged
Driven by Demographic Aging Pressure (well above) and Health, Disability & Isolation ‡ (well above); near the median on Housing & Transportation, 65+ ‡ and Social Isolation ‡; below the median on Economic Precarity, 65+ ‡.
‡ theme includes at least one flagged input.
Above the median — 6 counties (60th–80th percentile)
Pontiac — 78th percentile — Above the median 1 of 12 flagged
Driven by Economic Precarity, 65+ (well above), Health, Disability & Isolation ‡ (well above), Housing & Transportation, 65+ (well above) and Social Isolation (above); below the median on Demographic Aging Pressure.
‡ theme includes at least one flagged input.
Bloomfield charter township — 75th percentile — Above the median 1 of 12 flagged
Driven by Demographic Aging Pressure (well above) and Health, Disability & Isolation ‡ (well above); near the median on Housing & Transportation, 65+; below the median on Economic Precarity, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Waterford charter township — 72nd percentile — Above the median 1 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ (well above); near the median on Demographic Aging Pressure, Economic Precarity, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Rose township — 72nd percentile — Above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above) and Housing & Transportation, 65+ ‡ (well above); near the median on Economic Precarity, 65+ ‡ and Health, Disability & Isolation ‡; below the median on Social Isolation ‡.
‡ theme includes at least one flagged input.
Oak Park — 68th percentile — Above the median 1 of 12 flagged
Driven by Economic Precarity, 65+ (above), Health, Disability & Isolation (above) and Housing & Transportation, 65+ ‡ (well above); near the median on Social Isolation; below the median on Demographic Aging Pressure.
‡ theme includes at least one flagged input.
Holly township — 63rd percentile — Above the median 6 of 12 flagged
Driven by Economic Precarity, 65+ (above), Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ ‡ (above); below the median on Demographic Aging Pressure ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Near the median — 17 counties (40th–60th percentile)
Lake Angelus — 59th percentile — Near the median 5 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Social Isolation ‡ (above); near the median on Economic Precarity, 65+ ‡; below the median on Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Orion charter township — 55th percentile — Near the median 1 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ (well above); below the median on Demographic Aging Pressure, Economic Precarity, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Novi — 55th percentile — Near the median 1 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ (well above); below the median on Demographic Aging Pressure, Economic Precarity, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Rochester Hills — 54th percentile — Near the median 1 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ (above); near the median on Demographic Aging Pressure; below the median on Economic Precarity, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
White Lake charter township — 54th percentile — Near the median 2 of 12 flagged
Driven by Health, Disability & Isolation ‡ (above) and Housing & Transportation, 65+ (above); near the median on Demographic Aging Pressure and Economic Precarity, 65+; below the median on Social Isolation ‡.
‡ theme includes at least one flagged input.
Village of Clarkston — 53rd percentile — Near the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above); below the median on Economic Precarity, 65+ ‡, Health, Disability & Isolation ‡, Housing & Transportation, 65+ ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Commerce charter township — 52nd percentile — Near the median 2 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ ‡ (above); near the median on Economic Precarity, 65+; below the median on Demographic Aging Pressure and Social Isolation.
‡ theme includes at least one flagged input.
Royal Oak charter township — 49th percentile — Near the median 5 of 12 flagged
Driven by Economic Precarity, 65+ ‡ (well above) and Health, Disability & Isolation ‡ (above); near the median on Housing & Transportation, 65+ ‡ and Social Isolation ‡; below the median on Demographic Aging Pressure ‡.
‡ theme includes at least one flagged input.
Troy — 48th percentile — Near the median 1 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ (above); below the median on Demographic Aging Pressure, Economic Precarity, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Auburn Hills — 47th percentile — Near the median 4 of 12 flagged
Driven by Economic Precarity, 65+ (above), Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ ‡ (above); below the median on Demographic Aging Pressure and Social Isolation ‡.
‡ theme includes at least one flagged input.
Highland charter township — 47th percentile — Near the median 5 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ ‡ (above); near the median on Demographic Aging Pressure; below the median on Economic Precarity, 65+ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Milford charter township — 46th percentile — Near the median 3 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (above); near the median on Demographic Aging Pressure and Economic Precarity, 65+; below the median on Health, Disability & Isolation ‡ and Social Isolation.
‡ theme includes at least one flagged input.
Farmington — 46th percentile — Near the median 5 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ ‡ (above); near the median on Demographic Aging Pressure; below the median on Economic Precarity, 65+ ‡ and Social Isolation.
‡ theme includes at least one flagged input.
Clawson — 44th percentile — Near the median 2 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (well above); near the median on Health, Disability & Isolation ‡; below the median on Demographic Aging Pressure, Economic Precarity, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Hazel Park — 41st percentile — Near the median 5 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ ‡ (well above); near the median on Economic Precarity, 65+ and Social Isolation; below the median on Demographic Aging Pressure ‡.
‡ theme includes at least one flagged input.
Independence charter township — 41st percentile — Near the median 3 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above); near the median on Housing & Transportation, 65+ ‡; below the median on Demographic Aging Pressure, Economic Precarity, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Birmingham — 41st percentile — Near the median 3 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (above); near the median on Demographic Aging Pressure and Health, Disability & Isolation ‡; below the median on Economic Precarity, 65+ ‡ and Social Isolation.
‡ theme includes at least one flagged input.
Below the median — 13 counties (20th–40th percentile)
Springfield charter township — 39th percentile — Below the median 5 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above); near the median on Economic Precarity, 65+ and Housing & Transportation, 65+ ‡; below the median on Demographic Aging Pressure and Social Isolation ‡.
‡ theme includes at least one flagged input.
Royal Oak — 39th percentile — Below the median 1 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ (well above); near the median on Economic Precarity, 65+; below the median on Demographic Aging Pressure and Social Isolation.
‡ theme includes at least one flagged input.
South Lyon — 38th percentile — Below the median 4 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (above); near the median on Demographic Aging Pressure, Economic Precarity, 65+ and Social Isolation ‡; below the median on Health, Disability & Isolation ‡.
‡ theme includes at least one flagged input.
Oxford charter township — 38th percentile — Below the median 4 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ ‡ (above); near the median on Economic Precarity, 65+ ‡; below the median on Demographic Aging Pressure and Social Isolation.
‡ theme includes at least one flagged input.
Walled Lake — 37th percentile — Below the median 6 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (above); near the median on Health, Disability & Isolation ‡; below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Lathrup Village — 36th percentile — Below the median 5 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above); below the median on Economic Precarity, 65+ ‡, Health, Disability & Isolation ‡, Housing & Transportation, 65+ ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Rochester — 35th percentile — Below the median 3 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (well above); near the median on Economic Precarity, 65+ and Social Isolation; below the median on Demographic Aging Pressure and Health, Disability & Isolation ‡.
‡ theme includes at least one flagged input.
Sylvan Lake — 32nd percentile — Below the median 7 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (well above); near the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ ‡ and Health, Disability & Isolation ‡; below the median on Social Isolation ‡.
‡ theme includes at least one flagged input.
Orchard Lake Village — 30th percentile — Below the median 5 of 12 flagged
Driven by Economic Precarity, 65+ ‡ (above); near the median on Demographic Aging Pressure ‡ and Health, Disability & Isolation ‡; below the median on Housing & Transportation, 65+ ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Ferndale — 27th percentile — Below the median 2 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (well above); near the median on Economic Precarity, 65+ and Health, Disability & Isolation ‡; below the median on Demographic Aging Pressure and Social Isolation.
‡ theme includes at least one flagged input.
Brandon charter township — 25th percentile — Below the median 6 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (above); near the median on Health, Disability & Isolation ‡; below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Addison township — 25th percentile — Below the median 6 of 12 flagged
Near the median on Economic Precarity, 65+ and Housing & Transportation, 65+ ‡; below the median on Demographic Aging Pressure ‡, Health, Disability & Isolation ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Groveland township — 23rd percentile — Below the median 6 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (above); below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ ‡, Health, Disability & Isolation ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Well below the median — 8 counties (0th–20th percentile)
Northville — 19th percentile — Well below the median 6 of 12 flagged
Driven by Health, Disability & Isolation ‡ (above); below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ ‡, Housing & Transportation, 65+ ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Lyon charter township — 19th percentile — Well below the median 5 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Housing & Transportation, 65+ ‡ (above); below the median on Demographic Aging Pressure, Economic Precarity, 65+ ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Oakland charter township — 17th percentile — Well below the median 4 of 12 flagged
Near the median on Housing & Transportation, 65+ ‡; below the median on Demographic Aging Pressure, Economic Precarity, 65+, Health, Disability & Isolation ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Berkley — 15th percentile — Well below the median 3 of 12 flagged
Driven by Housing & Transportation, 65+ ‡ (well above); below the median on Demographic Aging Pressure, Economic Precarity, 65+, Health, Disability & Isolation ‡ and Social Isolation.
‡ theme includes at least one flagged input.
Wixom — 14th percentile — Well below the median 3 of 12 flagged
Driven by Economic Precarity, 65+ (above) and Housing & Transportation, 65+ ‡ (above); below the median on Demographic Aging Pressure ‡, Health, Disability & Isolation and Social Isolation.
‡ theme includes at least one flagged input.
Pleasant Ridge — 8th percentile — Well below the median 6 of 12 flagged
Near the median on Housing & Transportation, 65+ ‡; below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ ‡, Health, Disability & Isolation and Social Isolation ‡.
‡ theme includes at least one flagged input.
Huntington Woods — 6th percentile — Well below the median 4 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.
Novi township — 5th percentile — Well below the median 6 of 12 flagged
Driven by Health, Disability & Isolation ‡ (above); below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ ‡, 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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