Piatt County, Illinois Demographics 2026

Name: Piatt County, Illinois Demographics
Creator: U.S. Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

Piatt County, Illinois has a population of 16,695, the 63rd most populous county in Illinois. The median household income is $94,811 and the median home value is $180,600. The poverty rate is 6.1%.

Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes

Piatt County Quick Facts

Population 16,695

Median Household Income $94,811

Median Home Value $180,600

Poverty Rate 6.1%

Unemployment Rate 2.8%

Median Age 42.8 years

Homeownership Rate 84.9%

Affordability Ratio 1.9x

Bachelor's Degree+ 32.9%

High School Graduation 96.3%

Cities/Places 9

Population 16,695 63rd of 102

Median Income $94,811 14% higher than state

Poverty Rate 6.1%

Unemployment 2.8%

How Piatt County Changed

Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.

Metric	2019–2023	2020–2024	Change
Population	16,702	16,695	-0.0%
Median household income	$87,516	$94,811	+8.3%
Median home value	$173,200	$180,600	+4.3%

Median Household Income

Piatt

$94,811

$83,390

National

$80,734

Median Home Value

Piatt

$180,600

$263,300

National

$332,700

Economy & Housing

Household Income Distribution

Under $25K 9.4%

$25K-$50K 11.3%

$50K-$100K 34.7%

$100K+ 44.7%

Detailed income brackets

Under $10K

3.7%

$10K-$15K

2.1%

$15K-$20K

1.8%

$20K-$25K

1.8%

$25K-$30K

1.8%

$30K-$35K

1.4%

$35K-$40K

2.6%

$40K-$45K

3.0%

$45K-$50K

2.3%

$50K-$60K

7.3%

$60K-$75K

10.1%

$75K-$100K

17.3%

$100K-$125K

14.2%

$125K-$150K

10.5%

$150K-$200K

8.6%

$200K+

11.3%

Employment

2.8% Unemployment Rate State: 5.8%|National: 5.2%

65.0% Labor Force Participation

Housing Overview

Owner 84.9%

Renter 15.1%

Affordability Index Very Affordable

1.9x home value to income ratio

Median gross rent $1,046/mo 13.2% of median household income annually

People & Demographics

Age Distribution

Under 18

21.6%

18-34

17.8%

35-54

25.1%

55-74

26.6%

75+

8.8%

Race & Ethnicity

Diversity Index

Very Low Diversity

A less diverse community where one racial or ethnic group represents a large majority.

State average: 61 | National average: 61

Education

Educational Attainment (Adults 25+)

Cities & Places in Piatt County

City	Population	Median Income	Poverty	Home Value
Monticello	6,304	$99,449	5.7%	$210,500
Bement	1,792	$76,250	7.0%	$99,300
Cerro Gordo	1,349	$77,857	11.0%	$109,200
Mansfield	866	$78,750	8.3%	$142,200
Hammond	617	$77,019	5.0%	$102,500
De Land	448	$50,000	13.0%	$87,000
Cisco	234	$50,625	12.4%	$113,100
LaPlace	170	N/A	35.3%	$86,800
White Heath	163	$98,409	14.1%	$168,500

Explore Illinois Rankings

Cities by Population All cities ranked by size Richest Cities Ranked by median income Most Educated By bachelor's degree rate Most Affordable By housing affordability

Population Overview

Piatt County is located in Illinois with a total population of 16,695. It is the 63rd most populous county out of 102 in Illinois. The county encompasses 9 Census-designated places.

Age Demographics

The median age in Piatt County is 42.8 years. This is 10% higher than the state median of 39.0 years.

Economy, Income & Housing

The median household income in Piatt County is $94,811. This is 14% higher than the state median of $83,390. It is also 17% higher than the national median of $80,734. The poverty rate stands at 6.1%. This is 48% lower than the state poverty rate of 11.8%. The unemployment rate is 2.8%. This is 52% lower than the state rate of 5.8%. The median home value is $180,600. Housing costs are 31% lower than the state median of $263,300. With a home-value-to-income ratio of just 1.9x, Piatt County is one of the most affordable housing markets in the area. 84.9% of occupied housing units are owner-occupied. This homeownership rate is 26% higher than the state average of 67.1%.

Race & Ethnicity

Piatt County has a predominantly White (non-Hispanic) population, comprising 94.8% of all residents. Hispanic or Latino residents account for 1.6%. The White (non-Hispanic) population is significantly higher than the state average (94.8% vs 58.1%). The Black or African American population (1.2%) is well below the state average of 13.3%. The Hispanic or Latino population (1.6%) is well below the state average of 18.8%. The Asian population (0.6%) is well below the state average of 5.9%.

Education

32.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 13% lower than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.3%.

Data Sources & Methodology

All figures for Piatt County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Illinois and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.

Frequently Asked Questions

What is the population of Piatt County, Illinois?

Piatt County has a population of 16,695, making it the 63rd most populous county in Illinois.

What is the median income in Piatt County?

The median household income in Piatt County is $94,811 with a poverty rate of 6.1%.

How many cities are in Piatt County, Illinois?

Piatt County contains 9 Census-designated places.