Piatt   County IL United States

County FIPS 17147
Largest City Monticello
State Illinois
Latitude 40.0103
Longitude -88.5911
Population 16,695
Density 38.03 people per square mile
Time Zone America/Chicago
  • All demographic data comes from the 2024 American Community Survey (5-year study).
  • Learn more about each field.
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Household Income

Median household: $94,811
Median individual: $48,815

Race

Mode: 95.0% White

Gender

 50.1% female 

Rent

  $1046 / month  

Median house value: $182,621.0

Age

Median: 42.8 years old

Education

With at least college degree: 32.9%
With STEM degree: 39.9%

Marital Status

 61.0% married 

Never married: 22.8%

Labor Force Participation

 65.0% working 

Unemployed: 2.8%

Average Family Size

 2.85 people 

Commute Time

 24.0 minutes 

Health Care

 3.3% uninsured 

Poverty

 6.1%

All data comes from the SimpleMaps US Counties Database, 2026.

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