Mercer County, Missouri

Mercer County
County
Mercer County Courthouse in downtown Princeton
Location within the U.S. state of Missouri
Missouri's location within the U.S.
Coordinates: 40°25′N 93°34′W / 40.42°N 93.57°W / 40.42; -93.57
Country	United States
State	Missouri
Founded	February 14, 1845
Named for	John Francis Mercer
Seat	Princeton
Largest city	Princeton
Area
• Total	455 sq mi (1,180 km2)
• Land	454 sq mi (1,180 km2)
• Water	1.3 sq mi (3 km2)  0.3%
Population  (2020)
• Total	3,538
• Density	7.8/sq mi (3.0/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	6th

Mercer County is a county located in the northwestern portion of the U.S. state of Missouri. As of the 2020 census, the population was 3,538,^[1] making it the second-least populous county in Missouri. Its county seat is Princeton.^[2] The county was organized February 14, 1845, and named for General John F. Mercer of the Revolutionary War.