Piatt County | |
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![]() Piatt County Courthouse in Monticello | |
![]() Location within the U.S. state of Illinois | |
![]() Illinois's location within the U.S. | |
Coordinates: 40°01′N 88°35′W / 40.01°N 88.59°W | |
Country | ![]() |
State | ![]() |
Founded | 1841 |
Named for | James A. Piatt |
Seat | Monticello |
Largest city | Monticello |
Area | |
• Total | 439 sq mi (1,140 km2) |
• Land | 439 sq mi (1,140 km2) |
• Water | 0.3 sq mi (0.8 km2) 0.06% |
Population (2020) | |
• Total | 16,673 |
• Density | 38/sq mi (15/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional districts | 13th, 15th |
Website | www |
Piatt County is a county in Illinois. According to the 2020 United States Census, it had a population of 16,673.[1] Its county seat is Monticello.[2]
Piatt County is part of the Champaign–Urbana, IL Metropolitan Statistical Area.