Putnam County Courthouse (Illinois)

Putnam County Courthouse
U.S. National Register of Historic Places
Front and southern side
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Location	120 N. 4th St., Hennepin, Illinois
Coordinates	41°15′22″N 89°20′52″W / 41.25611°N 89.34778°W / 41.25611; -89.34778Coordinates: 41°15′22″N 89°20′52″W / 41.25611°N 89.34778°W / 41.25611; -89.34778
Area	1 acre (0.40 ha)
Built	1839 (1839)
Built by	Gorham & Durley
Architectural style	Greek Revival
NRHP Reference #	75000672
Added to NRHP	March 4, 1975

The Putnam County Courthouse, located at 120 N. 4th Street in Hennepin, is Putnam County, Illinois' county courthouse. Built in 1839, the building is the oldest courthouse in the state which is still in use. The courthouse was designed in the Greek Revival style and features four Doric columns at its front entrance. J.A. Williams later constructed an addition, which included a vault and document room, on the north side of the courthouse.

The courthouse was added to the National Register of Historic Places on March 4, 1975.