Warren County is named for Joseph Warren, who was a pioneer, physician and soldier killed at Bunker Hill during the American revolutionary War.
Surrounding County Courthouses:
N – Mercer County
E – Knox County and Fulton County
S – McDonough County
W – Henderson County
Created: January 13, 1825
County Seat:
Oquawka 1830 – 1836
Monmouth 1836 – present
County Courthouse – Monmouth
Location: 100 West Broadway Avenue / North Main Street
Built: 1894 – 1895
Style: Richardsonian Romanesque
Architect: O W Marble
Contractor: C A Moses
Description: The building faces south and is a three story red colored sandstone structure. The building is located on landscaped grounds in the center of Monmouth. The south front has high stone steps to a triple square opening with the entrance doorway recessed in the center. The building has a rough hewn red colored portage stone façade. The front wall rises to a peaked roof. The windows on the third story are arched. At the center of the building, there is a large square red stone tower with opening at the top. The roof is hipped. In the interior, the County Circuit Court courtroom is located along the north side of the third story. There is a small courtroom on the southwest side of the second story. The building houses the County Circuit Court of the 9th Judicial Circuit.
See: The 9th Judicial District includes Fulton County, Hancock County, Henderson County, Knox County and McDonough County.
History: The county was created in 1825 and Oquawka was selected as the county seat in 1830 and no courthouse was built. In 1831, a satellite courthouse was built in Monmouth and then a second courthouse in 1835. The county seat was moved to Monmouth in 1836 and the third courthouse was a large structure built in 1836 to 1841. The fourth and present courthouse was constructed in 1894 to 1895 at a cost of $130,000.
County Courthouse – Monmouth
County Circuit Court courtroom
County Circuit Court small courtroom
Photos taken 2007, 2012 and 2025
Images 18*