County · Illinois
Piatt County, Illinois
Piatt County, Illinois. Piatt County had 16,791 residents in 2025 by the Census Bureau's estimate, up 0.6% since 2020, while Illinois shrank 0.8%. It holds 19 places (9 cities, villages and boroughs, 8 towns and townships and 2 census-designated) and 4 census tracts. GEOID 17147.
Piatt County is one of the 3 counties of the Champaign-Urbana, IL metropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
16,791
Census Bureau estimate (no margin published)
2020 Census count: 16,673 · ACS 2020-2024: 16,695
Median household income
$94,811
±$8,069 (90% margin)
Illinois: $83,390
Median home value
$180,600
±$13,539 (90% margin)
Illinois: $263,300
Median gross rent
$1,046
±$175 (90% margin)
Illinois: $1,274
How many people live in Piatt County, and is it growing?
The 2020 Census counted 16,673 residents in Piatt County. The Census Bureau estimates 16,791 for July 1, 2025, up 0.6% since 2020, while Illinois shrank 0.8%. The 2020-2024 American Community Survey puts the population at 16,695 over 439 square miles of land.
| Measure | Piatt County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| Total population | 16,695 | 12,694,798 | +294 |
| Households | 6,924±149 | 5,036,449 | +232 |
| Average household size | 2.39±0.05 | 2.46 | no clear change |
| Housing units | 7,412±37 | 5,457,452 | no clear change |
Piatt County's population since 2000
From 16,365 in 2000 to 16,791 in 2025: up 2.6%. The 2000, 2010 and 2020 figures are census counts. 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); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Piatt County?
Piatt County holds 19 places: 9 cities, villages and boroughs (incorporated places), 8 towns and townships (county subdivisions with their own government) and 2 census-designated places. The largest is Monticello Township with 6,229 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Monticello Township | 6,132 | $99,256 |
|---|---|---|
| Monticello | 5,941 | $99,449 |
| Sangamon Township | 2,457 | $120,771 |
| Cerro Gordo Township | 1,899 | $86,193 |
| Bement Township | 1,657 | $79,167 |
| Bement | 1,484 | $76,250 |
| Unity Township | 1,392 | $80,536 |
| Blue Ridge Township | 1,382 | $86,705 |
| Cerro Gordo | 1,316 | $77,857 |
| Willow Branch Township | 966 | $88,929 |
| Mansfield | 928 | $78,750 |
| Goose Creek Township | 788 | $59,417 |
| Atwood | 1,116 | $62,383 |
| Hammond | 508 | $77,019 |
| De Land | 447 | $50,000 |
| Cisco | 254 | $50,625 |
| White HeathGEOID 1781295 | 251 | $98,409 |
| LaPlaceGEOID 1742067 | 239 | not published |
| IvesdaleGEOID 1737998 | 265 | $64,375 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Piatt County?
The median resident of Piatt County is 42.8 years old; 21.6% are under 18 and 21.1% are 65 or older. The largest group is non-Hispanic white residents at 94.8%, then Hispanic or Latino residents (of any race) at 1.6%. 1.7% of residents were born outside the United States.
| Measure | Piatt County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| Median age | 42.8±1.1 | 39.0 | no clear change |
| Under 18 years | 21.6%±0.2 pts | 21.8% | – |
| 65 years and over | 21.1%±0.2 pts | 17.0% | – |
| Hispanic or Latino (any race) | 1.6% | 18.8% | +0.2 pts |
| White alone, not Hispanic | 94.8%±0.4 pts | 58.1% | −1.4 pts |
| Black or African American alone, not Hispanic | 1.2%±0.5 pts | 13.3% | +0.6 pts |
| Asian alone, not Hispanic | 0.6%±0.3 pts | 5.9% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.2 pts | 0.0% | – |
| Two or more races, not Hispanic | 1.6%±0.7 pts | 3.4% | – |
| Some other race alone, not Hispanic | 0.2%±0.2 pts | 0.4% | – |
| Born outside the United States | 1.7%±0.6 pts | 14.7% | no clear change |
| Speak a language other than English at home (age 5+) | 2.4%±0.7 pts | 24.0% | – |
| Civilian veterans (age 18+) | 6.7%±1.1 pts | 4.8% | – |
| With a disability | 13.0%±1.5 pts | 12.1% | – |
| No health insurance coverage | 3.3%±0.8 pts | 6.9% | no clear change |
| High school graduate or higher (age 25+) | 96.2%±1.1 pts | 90.5% | – |
| Bachelor's degree or higher (age 25+) | 32.9%±3.1 pts | 37.8% | +4.3 pts |
| Graduate or professional degree (age 25+) | 11.8%±2.1 pts | 15.3% | – |
| Moved from another state in the past year | 0.5%±0.4 pts | 1.6% | – |
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 Piatt County earn?
Half of Piatt County's 6,924 households earn less than $94,811 a year (±$8,069), against $83,390 in Illinois. In 2015-2019 it was $87,193 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.1% of residents live below the poverty line.
| Measure | Piatt County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $94,811±$8,069 | $83,390 | no clear change |
| Mean household income | $113,102±$7,468 | $115,638 | – |
| Per capita income | $46,739±$2,619 | $46,406 | +$5,550 |
| People below the poverty line | 6.1%±1.6 pts | 11.8% | no clear change |
| Children under 18 below the poverty line | 6.7%±3.3 pts | 15.1% | no clear change |
| Households receiving SNAP | 6.3%±1.7 pts | 13.8% | – |
| Households with a broadband subscription | 91.3%±1.9 pts | 90.8% | – |
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 Piatt County?
Owners occupy 84.8% of Piatt County's occupied homes and renters 15.2%. The median owner-occupied home is valued at $180,600 by its owner (±$13,539). The median renter pays $1,046 a month including utilities, and 25.5% of renters pay 35% or more of their income on rent.
| Measure | Piatt County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $180,600±$13,539 | $263,300 | no clear change |
| Median gross rent | $1,046±$175 | $1,274 | no clear change |
| Renters paying 35% or more of income on rent | 25.5%±9.5 pts | 39.0% | no clear change |
| Median monthly owner costs, with a mortgage | $1,527±$90 | $1,987 | – |
| Owner-occupied homes | 84.8%±2.5 pts | 67.1% | no clear change |
| Housing units | 7,412±37 | 5,457,452 | no clear change |
| Homeowner vacancy rate | 0.6%±0.5 pts | 1.0% | – |
| Rental vacancy rate | 4.5%±3.2 pts | 5.0% | – |
| Single-family detached homes | 87.1%±3.0 pts | 58.2% | – |
| Mobile homes | 1.6%±0.7 pts | 2.3% | – |
| Built 2020 or later | 0.0%±0.5 pts | 0.7% | – |
| Built 1939 or earlier | 21.1%±3.0 pts | 20.2% | – |
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 many new homes is Piatt County building?
Builders took permits for 39 new housing units across Piatt County in 2025 (31 single-family), 2.3 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Piatt County get to work?
84.6% of Piatt County's workers drive alone and 7.3% work from home. The average trip to work takes 24.0 minutes. The unemployment rate in 2020-2024 averaged 2.8%.
| Measure | Piatt County | Illinois | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 65.0%±1.8 pts | 65.0% | – |
| Unemployment rate | 2.8%±0.8 pts | 5.8% | −1.9 pts |
| Drove alone to work | 84.6%±2.5 pts | 65.9% | – |
| Carpooled | 5.7%±1.5 pts | 7.8% | – |
| Public transportation | 0.1%±0.2 pts | 5.8% | – |
| Walked | 1.7%±0.7 pts | 2.8% | – |
| Worked from home | 7.3%±1.9 pts | 15.9% | +2.9 pts |
| Mean travel time to work | 24.0 min±1.7 | 27.8 min | no clear change |
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 are Piatt County's census tracts?
Piatt County is divided into 4 census tracts. Among those with a reliable estimate, median household income runs from $81,827 (Tract 9547) to $99,625 (Tract 9545).
| Tract 954517147954500 | 4,038±297 | $99,625 |
|---|---|---|
| Tract 954617147954600 | 6,661±225 | $98,914 |
| Tract 954717147954700 | 3,487±275 | $81,827 |
| Tract 954817147954800 | 2,509±282 | $87,159 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Piatt County compare with Illinois's other counties?
| Measure | Rank |
|---|---|
| Population | 63rd of 102 |
| Growth 2020-2025 | 11th of 102 |
| Residents per square mile | 65th of 102 |
| Median household income | 8th of 102 |
| Median home value | 22nd of 102 |
| Median gross rent | 13th of 102 |
| Poverty rate | 99th of 102 |
| Bachelor's degree or higher | 16th of 102 |
| Median age | 46th of 102 |
Source: PlainCities ranks 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 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 Piatt County 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.