Montgomery County | |
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![]() Montgomery County Courthouse, Hillsboro | |
![]() Location within the U.S. state of Illinois | |
![]() Illinois's location within the U.S. | |
Coordinates: 39°14′N 89°29′W / 39.23°N 89.48°W | |
Country | ![]() |
State | ![]() |
Founded | 1821 |
Named for | Richard Montgomery |
Seat | Hillsboro |
Largest city | Litchfield |
Area | |
• Total | 710 sq mi (1,800 km2) |
• Land | 704 sq mi (1,820 km2) |
• Water | 6.0 sq mi (16 km2) 0.8% |
Population (2020) | |
• Total | 28,288 |
• Density | 40/sq mi (15/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional district | 15th |
Website | www |
Montgomery County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 28,288.[1] Its county seat is Hillsboro.[2][3]