Washington County | |
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![]() Washington County Courthouse in Nashville | |
![]() Location within the U.S. state of Illinois | |
![]() Illinois's location within the U.S. | |
Coordinates: 38°21′N 89°25′W / 38.35°N 89.42°W | |
Country | ![]() |
State | ![]() |
Founded | January 2, 1818 |
Named for | George Washington |
Seat | Nashville |
Largest city | Nashville |
Area | |
• Total | 564 sq mi (1,460 km2) |
• Land | 563 sq mi (1,460 km2) |
• Water | 1.3 sq mi (3 km2) 0.2% |
Population (2020) | |
• Total | 13,761 |
• Density | 24/sq mi (9.4/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional district | 12th |
Website | www |
Washington County is a county located in the U.S. state of Illinois. As of the 2020 census, it had a population of 13,761.[1] Its county seat is Nashville.[2] It is located in the southern portion of Illinois known locally as "Little Egypt".