Mercer County , Missouri

Mercer County: County in Missouri, United States

Mercer County locator map
Location of Mercer County on Missouri map.


Mercer County is a county located in the U.S. state of Missouri. As of the 2010 census, the population was 3,785 and a population density of 3 people per km². After 9 years in 2019 county had an estimated population of 3,617 inhabitants. Its county seat is Princeton. The county was created 176 years ago in 1844.


Mercer County is located at 40°25'20"N 93°34'7"W (40.4223300, -93.5685600). It has 6 neighbors: Decatur County, Wayne County, Grundy County, Harrison County, Putnam County and Sullivan County.

Mercer County Missouri Courthouse 20151003-051 image
Mercer County Missouri Courthouse 20151003-051

The largest city of Mercer County is Princeton with a population of 1,099. Other cities include and Mercer population 301. See all Mercer County cities & populated places.


Mercer County forecast: Haze and patchy fog before 11am. Mostly sunny, with a high near 80. East southeast wind around 5 mph. more

Mercer County Missouri Courthouse 20151003-051 image

Mercer County map

Mercer County Quick Facts

Population : 3,617 (2019)
Country : United States of America
State : Missouri (United States)
Different from : Mercer County, Mercer County, Mercer County, Mercer County, Mercer County, Mercer County, Mercer County
Area : 1179 km2
Water as percent of area : 0.3%
Land as percent of area : 99.7%
Named for : John Francis Mercer
Capital : Princeton
Establishment : January 01, 1845
Time Zone : America/Chicago
Local time : 16:16:21 (3rd August 2021)
Density : 3 Pop. per km² as of 2019
Population growth : -4.64% (2010-2019)
Weather : 80℉ Haze then Mostly Sunny 7-days weather

Mercer County has 6 neighbours.

  • Princeton


According to census records, the population of Mercer County decreased by 4.64% in 9 years.

Year Population % Change Method
2010 3,785 - census
2011 3,774 -0.29% estimation process
2012 3,708 -1.78% estimation process
2013 3,664 -1.2% estimation process
2014 3,683 0.52% estimation process
2015 3,660 -0.63% estimation process
2016 3,661 0.03% estimation process
2017 3,656 -0.14% estimation process
2018 3,626 -0.83% estimation process
2019 3,617 -0.25% estimation process

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People born in Mercer County (1)

Texas politician Roy Alvin Baldwin was born in Mercer County

Other places with the same name (7)

Mercer County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Mercer County.

City Name Population Title
Princeton 1,099 City in Mercer County, Missouri
Mercer 301 City in Missouri, USA
Ravanna 208 Township in Mercer County, Missouri
South Lineville 27 Village in the United States

Missouri Other Counties (more counties)

County Name Population Title
Missouri 6,137,428 State of the United States of America
Saint Louis County 994,205 County in Minnesota, United States
Jackson County 703,011 County in Oregon, United States
Kansas City 495,327 Largest municipality in the U.
Saint Charles County 402,022 County in Missouri, United States
St. Louis 315,685 City in Missouri, United States
Greene County 293,086 County in Tennessee, United States
Clay County 249,948 County in North Carolina, United States
Jefferson County 225,081 County in Missouri, United States
Boone County 180,463 County in West Virginia, United States
Columbia 123,195 City in Missouri, United States
Jasper County 121,328 County in South Carolina, United States
East Independence 110,675 City in Jackson County, Missouri, United States of America
Cass County 105,780 County in Missouri, United States
Platte County 104,418 County in Wyoming, United States
Franklin County 103,967 County in Missouri, United States

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