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

McHenry County — Aging Vulnerability Index by county subdivision

Candidate index, not validated against ground truth — 2020–2024 ACS 5-year
McHenry County — Aging Vulnerability Index by county subdivision
Anamoose — 51 (Upper-middle)Anamoose township — 3 (Lower)Balfour — no data (unmeasured)Balfour township — no data (unmeasured)Bantry township — 9 (Lower)Bergen — no data (unmeasured)Berwick township — no data (unmeasured)Bjornson township — no data (unmeasured)Brown township — no data (unmeasured)Cottonwood Lake township — no data (unmeasured)Deep River township — no data (unmeasured)Deering — 14 (Lower-middle)Deering township — 9 (Lower-middle)Denbigh township — no data (unmeasured)Drake — 78 (Higher)East McHenry UT — no data (unmeasured)Egg Creek township — 18 (Lower-middle)Falsen township — no data (unmeasured)Gilmore township — no data (unmeasured)Granville — 16 (Lower-middle)Granville township — 67 (Higher)Grilley township — 27 (Middle)Hendrickson township — no data (unmeasured)Karlsruhe — 61 (Upper-middle)Karlsruhe township — no data (unmeasured)Kief — no data (unmeasured)Kottke Valley township — no data (unmeasured)Lake George township — 67 (Higher)Lake Hester township — no data (unmeasured)Land township — 34 (Middle)Layton township — no data (unmeasured)Lebanon township — 66 (Upper-middle)Little Deep township — no data (unmeasured)Meadow township — 1 (Lower)Mouse River township — no data (unmeasured)Newport township — 16 (Lower-middle)Normal township — no data (unmeasured)Northeast McHenry UT — 6 (Lower)North Prairie township — no data (unmeasured)Norwich township — 38 (Middle)Odin township — 61 (Upper-middle)Olivia township — no data (unmeasured)Pratt township — no data (unmeasured)Riga township — 23 (Middle)Rose Hill township — no data (unmeasured)Round Lake township — no data (unmeasured)Saline township — no data (unmeasured)Schiller township — 43 (Middle)Spring Grove township — 7 (Lower)Strege township — 12 (Lower-middle)Towner — 72 (Higher)Upham — 64 (Upper-middle)Velva — 50 (Middle)Velva township — 75 (Higher)Villard township — 68 (Higher)Voltaire — 66 (Upper-middle)Voltaire township — 7 (Lower)Wagar township — no data (unmeasured)Willow Creek township — no data (unmeasured)
Where this is
Shading: Aging Vulnerability Index
Lower (1 to 9)Lower-middle (9 to 18)Middle (23 to 50)Upper-middle (51 to 66)Higher (67 to 78)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: 36th percentile (among all U.S. county subdivisions).
These county subdivisions span the 1st percentile to the 78th percentile. The width of that range is the internal disparity.
Well above the median0 (0%)
Above the median11 (37%)
Near the median3 (10%)
Below the median4 (13%)
Well below the median12 (40%)
Widest spread across these county subdivisions: Social Isolation — 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.
Above the median — 11 counties (60th–80th percentile)
Drake — 78th percentile — Above the median 7 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above), Economic Precarity, 65+ (well above) and Social Isolation ‡ (well above); near the median on Health, Disability & Isolation ‡; below the median on Housing & Transportation, 65+ ‡.
‡ theme includes at least one flagged input.
Velva township — 75th percentile — Above the median 7 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Housing & Transportation, 65+ ‡ (well above); below the median on Economic Precarity, 65+, Health, Disability & Isolation and Social Isolation ‡.
‡ theme includes at least one flagged input.
Towner — 72nd percentile — Above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above), Economic Precarity, 65+ ‡ (well above) and Health, Disability & Isolation ‡ (above); below the median on Housing & Transportation, 65+ ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Villard township — 68th percentile — Above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above), Economic Precarity, 65+ ‡ (well above) and Social Isolation ‡ (well above); below the median on Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Lake George township — 67th percentile — Above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Social Isolation ‡ (well above); below the median on Economic Precarity, 65+, Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Granville township — 67th percentile — Above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Social Isolation ‡ (well above); below the median on Economic Precarity, 65+, Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Lebanon township — 66th percentile — Above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Health, Disability & Isolation ‡ (above); near the median on Social Isolation ‡; below the median on Economic Precarity, 65+ and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Voltaire — 66th percentile — Above the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Social Isolation ‡ (well above); below the median on Economic Precarity, 65+, Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Upham — 64th percentile — Above the median 8 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Social Isolation ‡ (well above); below the median on Economic Precarity, 65+ ‡, Health, Disability & Isolation and Housing & Transportation, 65+ ‡.
‡ theme includes at least one flagged input.
Karlsruhe — 61st percentile — Above the median 7 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Social Isolation ‡ (well 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.
Odin township — 61st percentile — Above the median 7 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above), Economic Precarity, 65+ ‡ (well above) and Social Isolation ‡ (well above); below the median on Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Near the median — 3 counties (40th–60th percentile)
Anamoose — 51st percentile — Near the median 6 of 12 flagged
Driven by Economic Precarity, 65+ ‡ (well above) and Health, Disability & Isolation ‡ (above); near the median on Demographic Aging Pressure ‡; below the median on Housing & Transportation, 65+ ‡ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Velva — 50th percentile — Near the median 3 of 12 flagged
Driven by Demographic Aging Pressure (above) and Social Isolation ‡ (well 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.
Schiller township — 43rd percentile — Near the median 5 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Social Isolation ‡ (well above); below the median on Economic Precarity, 65+, Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Below the median — 4 counties (20th–40th percentile)
Norwich township — 38th percentile — Below the median 5 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above); near the median on Housing & Transportation, 65+ ‡ and Social Isolation ‡; below the median on Economic Precarity, 65+ and Health, Disability & Isolation.
‡ theme includes at least one flagged input.
Land township — 34th 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.
Grilley township — 27th percentile — Below the median 6 of 12 flagged
Driven by Demographic Aging Pressure ‡ (well above) and Social Isolation ‡ (above); below the median on Economic Precarity, 65+, Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Riga township — 23rd 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.
Well below the median — 12 counties (0th–20th percentile)
Egg Creek township — 18th percentile — Well below the median 6 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above) and Social Isolation ‡ (well above); below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+ and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Newport township — 16th percentile — Well below the median 4 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.
Granville — 16th percentile — Well below the median 7 of 12 flagged
Driven by Economic Precarity, 65+ ‡ (above); near the median on Health, Disability & Isolation ‡ and Social Isolation ‡; below the median on Demographic Aging Pressure ‡ and Housing & Transportation, 65+ ‡.
‡ theme includes at least one flagged input.
Deering — 14th percentile — Well below the median 6 of 12 flagged
Driven by Health, Disability & Isolation ‡ (well above); below the median on Demographic Aging Pressure ‡, Economic Precarity, 65+, Housing & Transportation, 65+ and Social Isolation ‡.
‡ theme includes at least one flagged input.
Strege township — 12th percentile — Well below the median 6 of 12 flagged
Driven by Social Isolation ‡ (well above); near the median on Economic Precarity, 65+ ‡; below the median on Demographic Aging Pressure ‡, Health, Disability & Isolation and Housing & Transportation, 65+.
‡ theme includes at least one flagged input.
Deering township — 9th percentile — Well below the median 8 of 12 flagged
Driven by Health, Disability & Isolation ‡ (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.
Bantry township — 9th percentile — Well below the median 3 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above); below the median on Economic Precarity, 65+, Health, Disability & Isolation, Housing & Transportation, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Spring Grove township — 7th percentile — Well below the median 3 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above); below the median on Economic Precarity, 65+, Health, Disability & Isolation, Housing & Transportation, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Voltaire township — 7th percentile — Well below the median 3 of 12 flagged
Driven by Demographic Aging Pressure ‡ (above); below the median on Economic Precarity, 65+, Health, Disability & Isolation, Housing & Transportation, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
Northeast McHenry UT — 6th 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.
Anamoose township — 3rd 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.
Meadow township — 1st percentile — Well below the median 5 of 12 flagged
Driven by Economic Precarity, 65+ ‡ (above); below the median on Demographic Aging Pressure ‡, Health, Disability & Isolation ‡, Housing & Transportation, 65+ and Social Isolation.
‡ theme includes at least one flagged input.
29 counties 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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