Township · Illinois
Casey Township, Illinois
Casey Township, township, in Clark County, Illinois. Casey Township had 3,413 residents on July 1, 2025 by the Census Bureau's estimate, down 2.3% since 2020; the 2020 Census counted 3,459 and the ACS 2020-2024 5-year estimates put it at 3,451 (±19). GEOID 1702311631.
Residents, July 2025 estimate
3,413
Census Bureau estimate (no margin published)
2020 Census count: 3,459 · ACS 2020-2024: 3,451 ±19
Median household income
$59,679
±$10,781 (90% margin)
Illinois: $83,390
Median home value
$137,300
±$27,359 (90% margin)
Illinois: $263,300
Median gross rent
$746
±$160 (90% margin)
Illinois: $1,274
Where is Casey Township and what county is it in?
Casey Township is a township in Clark County, Illinois. It covers 36.2 square miles of land, 95 residents per square mile in 2020.
One place lies inside Casey Township: Casey (city, 2,404 in 2020). Part of Martinsville (city) also lies in it.
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Casey Township, and is it growing?
The Census Bureau estimates that 3,413 people lived in Casey Township on July 1, 2025, down 2.3% since 2020, a steeper fall than Illinois's (−0.8%). The 2020 Census counted 3,459 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 3,451 (±19).
| Measure | Casey Township | Clark County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 3,451±19 | 15,266 | −344 |
| Households | 1,520±111 | 6,555 | −210 |
| Average household size | 2.21±0.16 | 2.29 | no clear change |
| Housing units | 1,734±135 | 7,307 | −283 |
Casey Township's population since 2000
From 4,176 in 2000 to 3,413 in 2025: down 18.3%. The 2000, 2010 and 2020 figures are census counts, each for Casey Township as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Casey Township?
The median resident of Casey Township is 39.6 years old; 24.5% are under 18 and 21.4% are 65 or older. The largest group is non-Hispanic white residents at 93.7%, then Hispanic or Latino residents (of any race) at 5.3%.
| Measure | Casey Township | Clark County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.6±1.8 | 42.6 | no clear change |
| Under 18 years | 24.5%±2.9 pts | 22.4% | – |
| 65 years and over | 21.4%±3.3 pts | 20.3% | – |
| Male | 47.7%±2.9 pts | 50.3% | – |
| Hispanic or Latino (any race) | 5.3%±2.0 pts | 1.9% | – |
| White alone, not Hispanic | 93.7%±2.2 pts | 95.0% | no clear change |
| Black or African American alone, not Hispanic | 0.3%±0.7 pts | 0.5% | – |
| Asian alone, not Hispanic | 0.0%±1.1 pts | 0.1% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.3 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±1.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 0.6%±0.5 pts | 2.5% | – |
| Some other race alone, not Hispanic | 0.0%±1.1 pts | 0.0% | – |
| Born outside the United States | 2.2%±1.6 pts | 1.3% | – |
| Speak a language other than English at home (age 5+) | 3.8%±2.6 pts | 2.2% | – |
| Civilian veterans (age 18+) | 7.1%±2.8 pts | 7.8% | – |
| With a disability | 12.1%±2.9 pts | 13.6% | – |
| No health insurance coverage | 3.3%±1.8 pts | 4.7% | no clear change |
| High school graduate or higher (age 25+) | 90.6%±3.7 pts | 92.5% | – |
| Bachelor's degree or higher (age 25+) | 18.2%±4.3 pts | 24.9% | no clear change |
| Graduate or professional degree (age 25+) | 2.8%±1.7 pts | 8.7% | – |
| Lived in the same house a year earlier | 95.3%±2.2 pts | 90.2% | – |
| Moved from another state in the past year | 1.0%±0.9 pts | 1.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Casey Township earn?
Half of Casey Township's 1,520 households earn less than $59,679 a year (±$10,781), against $72,927 in Clark County and $83,390 in Illinois. In 2015-2019 it was $64,965 in 2024 dollars; the margins of error cannot tell the two periods apart. 8.2% of residents live below the poverty line.
| Measure | Casey Township | Clark County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $59,679±$10,781 | $72,927 | no clear change |
| Mean household income | $85,621±$17,912 | $87,731 | – |
| Per capita income | $38,289±$7,787 | $37,528 | no clear change |
| People below the poverty line | 8.2%±3.6 pts | 9.1% | no clear change |
| Children under 18 below the poverty line | 7.9%±6.6 pts | 9.4% | – |
| Households receiving SNAP | 14.6%±4.8 pts | 13.4% | – |
| Households with a computer | 93.6%±3.3 pts | 91.2% | – |
| Households with a broadband subscription | 86.6%±5.6 pts | 87.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Casey Township?
Owners occupy 79.9% of Casey Township's occupied homes and renters 20.1%. The median owner-occupied home is valued at $137,300 by its owner (±$27,359). The median renter pays $746 a month including utilities, and 24.1% of renters pay 35% or more of their income on rent.
| Measure | Casey Township | Clark County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $137,300±$27,359 | $132,400 | +$42,783 |
| Median gross rent | $746±$160 | $861 | no clear change |
| Renters paying 35% or more of income on rent | 24.1%±13.4 pts | 36.5% | no clear change |
| Median monthly owner costs, with a mortgage | $1,196±$130 | $1,233 | – |
| Owner-occupied homes | 79.9%±5.8 pts | 80.3% | no clear change |
| Renter-occupied homes | 20.1%±5.8 pts | 19.7% | – |
| Housing units | 1,734±135 | 7,307 | −283 |
| Homeowner vacancy rate | 1.7%±2.7 pts | 2.1% | – |
| Rental vacancy rate | 4.7%±7.0 pts | 4.8% | – |
| Single-family detached homes | 77.2%±6.6 pts | 81.6% | – |
| Mobile homes | 10.1%±6.1 pts | 6.6% | – |
| Built 2020 or later | 0.0%±2.1 pts | 0.0% | – |
| Built 2010 to 2019 | 3.1%±2.6 pts | 5.6% | – |
| Built 1939 or earlier | 19.4%±5.7 pts | 21.4% | – |
| Households with no vehicle | 5.5%±3.3 pts | 5.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Casey Township work and get to work?
80.0% of Casey Township's workers drive alone and 8.1% work from home. The average trip to work takes 28.4 minutes. The unemployment rate in 2020-2024 averaged 5.4%.
| Measure | Casey Township | Clark County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 61.4%±4.8 pts | 61.3% | – |
| Unemployment rate | 5.4%±3.3 pts | 3.7% | no clear change |
| Drove alone to work | 80.0%±6.8 pts | 84.1% | – |
| Carpooled | 10.8%±5.8 pts | 8.3% | – |
| Public transportation | 0.0%±2.4 pts | 0.0% | – |
| Walked | 0.4%±0.7 pts | 1.5% | – |
| Worked from home | 8.1%±4.3 pts | 5.2% | – |
| Mean travel time to work | 28.4 min±5.4 | 25.2 min | +7.3 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Casey Township?
1 census tract lies mostly in Casey Township, and 1 more reaches into it (2020 census blocks).
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Casey Township) · Census block assignment files
How does Casey Township compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Casey Township is the 3,221st-most populous of the 16,079 U.S. towns and townships that have one and the 309th-most populous of 1,407 in Illinois.
Casey Township ranks 1,097th of 1,380 places in Illinois with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 309th | 1,407 |
| Growth 2020-2025 (PEP) | 788th | 1,347 |
| Residents per square mile | 1,013th | 1,383 |
| Median household income | 1,097th | 1,380 |
| Per capita income | 704th | 1,383 |
| Median home value | 908th | 1,379 |
| Median gross rent | 1,088th | 1,280 |
| Poverty rate | 697th | 1,119 |
| Bachelor's degree or higher | 987th | 1,369 |
| Median age | 861st | 1,383 |
| Owner-occupied share | 577th | 1,382 |
| Work from home | 735th | 1,015 |
| Travel time to work | 405th | 1,382 |
Casey Township's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Casey Township with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Casey Township?
16 of the 57 figures for Casey Township on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Casey Township are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.