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Mercer County

Mercer County is named for John F Mercer, who was an American lawyer, painter and politician from Virginia and Maryland.


Surrounding County Courthouses: 

N – Decatur County, Iowa and Wayne County, Iowa

E – Putnam County and Sullivan County

S – Grundy County

W – Harrison County


Created:  February 14, 1845                  Map of Missouri highlighting Mercer County

County Seat:

Princeton  1845 – present


County Courthouse –  Princeton  


Location:  802 East Main Street / Broadway Street

Built:  1911 – 1913

Style:  Classical Revival

Architect:  R W Van Trump and Rae Sanneman of Kansas City

Contractor:  J E Anderson of Kansas City.


Description:  The building faces north and is a three story gray colored stone and concrete structure. The rectangular shaped building is located on landscaped grounds in the center of Princeton.  The building has a raised basement on the first story which is above ground level on the south side. The building is 65 feet by 90 feet. The north front has a projecting portico supported by four high columns with a pediment above at the roof line. There is stone trim around the main entrance on the second story. A projecting cornice runs below the flat roof line. In the interior, there is a 300 person assembly room on the first story. The large County Circuit Court courtroom is located on the third story. There is also small County Circuit Court courtroom. The building houses the County Circuit Court of the 3rd Judicial Circuit. 


See:  The 3rd Judicial Circuit includes Grundy County, Harrison County, Mercer County and Putnam County.


History:  The county was created in 1845 and Princeton was designated as the county seat. The first courthouse was a two story log structure built in 1847. The second courthouse was a brick structure built in 1858 by H B Nesbitt at a cost of $8,000. The third and present courthouse was constructed in 1911 to 1913 at a cost of $76,000.



County Courthouse – Princeton













County Circuit Court courtroom

















County Circuit Court small courtroom





Photos taken 2009 and 2023