List of counties in Missouri

Independent city and Counties of Missouri
AT HO ND AN BH PL CY CT DK GY WO HA DV CD RY CR LV GN ME PM SV LI CN RH MC AD SR SD CK KX LW SH MN MR RS AU PI LN MY CW BN HW SA LF JK CS JO PE CP MG MO CO ML OS MA GA WN CH FK SL ←LC JE SG PY SF MI IR WA CF PH PU CM HI BE HE BA CL VE CE BT DD PK DA GR XN WB LA WR DG TX DT SN RN WY BO CG ST SC MS NM PS DU BU CA RI OR HL OZ TA SE LR JA NN BY MD
Location	State of Missouri
Number	114 Counties 1 Independent city
Populations	(Counties only):2,171 (Worth) – 1,000,438 (Saint Louis)
Areas	(Counties only):266 square miles (690 km2) (Worth) – 1,179 square miles (3,050 km2) (Texas)
Government	County government
Subdivisions	cities, towns, unincorporated communities, census designated place

There are 114 counties and one independent city in the U.S. state of Missouri. Following the Louisiana Purchase and the admittance of Louisiana into the United States in 1812, five counties were formed out of the Missouri Territory at the first general assembly: Cape Girardeau, New Madrid, Saint Charles, Saint Louis, and Ste. Genevieve. Most subsequent counties were apportioned from these five original counties. Six more counties were added through the 1836 Platte Purchase, the acquired lands of which formed the northwest tip of the state and consisted of Andrew, Atchison, Buchanan, Holt, Nodaway, and Platte counties.

In Missouri, the county level of government comes between those of the city and the state. Its primary responsibilities include maintaining roads, providing security, prosecuting criminals, and collecting taxes. Elected officials at this level include a sheriff, prosecuting attorney, and assessor.

Most of the counties in Missouri are named after politicians. One such county, Cass, was originally named Van Buren County after President Martin Van Buren, and was changed to its present name in support of Van Buren's Democratic opponent Lewis Cass during the presidential election of 1848. Other counties are named after war heroes, natural resources, explorers, and former U.S. territories.