Monticello Courthouse Square Historic District | |
 Piatt County Courthouse | |
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 Interactive map showing the location for Monticello County Courthouse Square Historic District | |
| Location | Roughly bounded by Market, RR tracks, N. Hamilton, Independence & Marion Sts., Monticello, Illinois |
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| Coordinates | 40°1′30″N 88°34′21″W / 40.02500°N 88.57250°W |
| Area | 28 acres (11 ha) |
| Architectural style | Italianate, Classical Revival |
| NRHP reference No. | 08000400[1] |
| Added to NRHP | November 5, 2009 |
The Monticello Courthouse Square Historic District is a historic district in downtown Monticello, Illinois. The district includes the historic commercial center of the city, the county seat of Piatt County, and is centered on the Piatt County Courthouse. 80 buildings are included in the district, 73 of which are considered contributing to its historic character. The district was added to the National Register of Historic Places on November 5, 2009.[1]