County Founded

County                                         Date Founded 

#1 Ste. Genevieve County                 October 1st 1812

#1 Cape Girardeau County               October 1st 1812

#1 New Madrid County                      October 1st 1812

#1 St. Charles County                         October 1st 1812

#1 St. Louis County                             October 1st 1812

#6 Washington County                      August 21st 1813

#7 Saint Louis City                              January 18th 1816

#8 Howard County                             Janurary 23rd 1816

#9 Franklin County                            October 11th 1818

#10 Jefferson County                         December 8th 1818

#10 Wayne County                              December 11th 1818

#11 Lincoln County                            December 14th 1818

#11 Madison County                          December 14th 1818

#11 Montgomery County                 December 14th 1818

#11 Pike County                                 December 14th 1818

#15 Pulaski County                            December 15th 1818

#17 Cooper County                            December 17th 1818

#18 Boone County                             November 16th 1820

#18 CharitonCounty                          November 16th 1820

#18 Lafayette County                        November 16th 1820

#18 PerryCounty                                 November 16th 1820

#18 Ralls County                                  November 16th 1820

#18 Ray County                                    November 16th 1820

#18 Atchison County                           November 16th 1820

#25 Cole County                                   November 20th 1820

#26 Callaway County                           November 25th 1820

#26 Gasconade County                       November 25th 1820

#26 Saline County                                November 25th 1820

#29 Saint Francois County                 December 19th 1821

#30 Scott County                                   December 28th 1821

#31 Clay County                                     January 2nd 1822

#32 Marion County                               December 14th 1822

#33 Jackson County                              December 15th 1826

#34 Randolph County                           January 22nd 1829

#35 Crawford County                            January 23rd 1929

#36 Monroe County                               January 6th 1831

#37 Greene County                                January 2nd 1833

#37 Lewis County                                   January 2nd 1833

#39 Benton County                                January 3rd 1833

#39 Carroll County                                 January 3rd 1833

#41 Morgan County                               January 5th 1833

#41 Ripley County                                  January 5th 1833

#41 Warren County                                January 5th 1833

#44 Clinton County                                January 15th 1833

#45 Pettis County                                    January 26th 1833

#46 Johnson County                              December 13th 1834

#46 Henry County                                  December 13th 1834

#48 Shelby County                                  January 2nd 1835

#48 Stoddard County                              January 2nd 1835

#50 Cass County                                      September 14th 1835

#51 Clark County                                     January 2nd 1836

#52 BarryCounty                                      January 5th 1836

#53 Audrain County                               December 17th 1836

#54 Caldwell County                              December 26th 1836

#55 Daviess County                                December 29th 1836

#56 Camden County                               January 6th 1837

#56 Livingston County                           January 6th 1837

#56 Macon County                                  January 6th 1837

#59 Linn County                                      January 7th 1837

#60 Taney County                                    January 16th 1837

#61 Miller County                                    February 6th 1837

#62 Polk County                                       March 20th 1837

#63 Newton County                                December 31st 1838

#63 PlatteCounty                                    December 31st 1838

#65 Buchanan County                           February 10th 1839

#66 AndrewCounty                                 January 29th 1841

#66 Texas County                                    January 29th 1841

#66 Adair County                                     January 29th 1841

#66 Bates County                                     January 29th 1841

#66 Dade County                                     January 29th 1841

#66 Grundy County                                 January 29th 1841

#66 Jasper County                                   January 29th 1841

#66 Dallas County                                   January 29th 1841

#66 Osage County                                    January 29th 1841

#66 Scotland County                               January 29th 1841

#66 Shannon County                              January 29th 1841

#66 Wright County                                  January 29th 1841

#78 Gentry County                                  February 12th 1841

#79 St. Clair County                                February 15th 1841

#80 Sullivan County                                February 17th 1843

#81 Ozark County                                   February 22nd 1843

#82 Holt County                                      January 29th 1845

#83 Cedar County                                  February 14th 1845

#83 Dunklin County                              February 14th 1845

#83 Harrison County                            February 14th 1845

#83 Hickory County                              February 14th 1845

#83 Knox County                                    February 14th 1845

#83 Mercer County                                February 14th 1845

#83 Mississippi County                         February 14th 1845

#83 Moniteau County                           February 14th 1845

#83 Schuyler County                             February 14th 1845

#92 DeKalb County                                February 25th 1845

#92 Lawrence County                          February 25th 1845

#92 Reynolds County                           February 25th 1845

#95 Putnam County                             November 16th 1845

#96 Nodaway County                          December 14th 1845

#97 Butler County                               February 27th 1849

#97 Laclede County                            February 27th 1849

#99 McDonald County                       March 3rd 1849

#100 Dent County                               February 10th 1851

#100 Stone County                             February 10th 1851

#102 Pemiscot County                      February 15th 1851

#103 Vernon County                         February 17th 1851

#104 Bollinger County                      March 1st 1851

#105 Maries County                           March 2nd 1855

#106 Webster County                        March 3rd 1855

#107 Barton County                          December 12th 1855

#108 Iron County                               February 16th 1857

#109 Howell County                          March 2nd 1857

#110 Douglas County                        October 29th 1857

#111 Phelps County                          November 13th 1857

#112 Carter County                           March 13th 1859

#113 Christian County                     March 20th 1859

#114 Worth County                           February 8th 1861

#115 Oregon County                         February 14th 1845