Population of Counties in Missouri (2022)

There are 115 counties in Missouri.

In 2019, the most populous county in Missouri is St. Louis County with a population of 996,945. This represents modest population decline of 0.19% since the 2010 census. Other major counties in Missouri include Jackson County (700,307), St. Charles County (399,182), and St. Louis City (302,838). These are the only counties with more than 300,000 residents, although there are eight other counties with at least 100,000 residents. Of these counties, St. Charles County experienced the most rapid growth at 10.33% since 2010.

Missouri Counties with Fewest Residents

The smallest Missouri county in terms of population is Worth County with just 2,040 residents. This represents a growth rate of -5.20% since 2010. Missouri has six other counties under 5,000 residents including Mercer County (3,641), Knox County (3,947), and Holt County (4,404). All of these counties lost residents since 2010 with the most dramatic decline in Holt County with a growth rate of -10.40%.

Missouri Counties with Rapid Growth

The fastest-growing county in Missouri since the 2010 census is Platte County with a growth rate of 14.81%, bringing its total population to 102,985. Other counties with rapid growth include Clay County grew 10.63% to 246,365, and St. Charles County grew 10.33% to 399,182, and Boone County grew 10.30% to 180,005. The county with the most significant decline was Pemiscot County which lost 10.94% of its residents.

Name 2022 Population Growth Since 2010 Density (mi²)
Adair County24,944-2.66%43.97
Andrew County17,8622.99%41.28
Atchison County5,023-11.19%9.18
Audrain County25,283-0.67%36.52
Barry County36,0201.31%46.28
Barton County11,646-5.95%19.67
Bates County15,776-7.35%18.86
Benton County19,8814.11%28.24
Bollinger County11,965-3.05%19.36
Boone County184,66913.15%269.38
Buchanan County84,967-4.61%208.24
Butler County42,151-1.48%60.68
Caldwell County8,867-5.95%20.80
Callaway County44,110-0.45%52.85
Camden County47,4817.72%72.38
Cape Girardeau County79,5704.84%137.54
Carroll County8,538-8.02%12.29
Carter County5,679-9.77%11.19
Cass County108,8139.08%156.19
Cedar County14,9887.29%31.59
Chariton County7,333-6.36%9.76
Christian County93,24819.79%165.73
Clark County6,689-6.25%13.25
Clay County260,71217.09%655.65
Clinton County20,243-2.40%48.32
Cole County76,8200.88%196.21
Cooper County17,9582.02%31.80
Crawford County23,776-3.47%32.02
Dade County7,552-3.66%15.41
Dallas County17,1662.66%31.74
Daviess County8,110-4.01%14.40
DeKalb County12,643-1.95%30.01
Dent County15,651-0.57%20.79
Douglas County12,663-7.24%15.56
Dunklin County28,090-12.08%51.92
Franklin County104,7203.25%113.50
Gasconade County14,784-2.75%28.49
Gentry County6,490-3.85%13.21
Greene County299,1828.67%443.02
Grundy County9,475-7.59%21.77
Harrison County8,226-8.26%11.39
Henry County21,872-1.76%31.38
Hickory County9,8021.62%24.58
Holt County4,376-10.97%9.46
Howard County9,827-3.10%21.19
Howell County40,090-1.14%43.24
Iron County9,939-6.17%18.06
Jackson County709,6925.16%1,174.06
Jasper County123,9475.35%194.13
Jefferson County227,0943.64%345.84
Johnson County55,3855.12%66.79
Knox County3,941-4.46%7.82
Laclede County36,1041.13%47.21
Lafayette County33,206-0.52%52.84
Lawrence County38,6280.10%63.14
Lewis County9,587-6.10%18.98
Lincoln County63,21320.01%100.89
Linn County11,563-9.48%18.78
Livingston County15,3651.57%28.86
McDonald County22,459-2.66%41.63
Macon County14,967-4.01%18.68
Madison County11,788-3.35%23.84
Maries County8,478-7.47%16.09
Marion County28,500-1.00%65.23
Mercer County3,590-4.77%7.91
Miller County26,5317.34%44.77
Mississippi County12,538-12.51%30.46
Moniteau County15,9702.20%38.48
Monroe County8,668-1.34%13.38
Montgomery County11,740-3.83%21.94
Morgan County21,2663.52%35.58
New Madrid County16,488-12.92%24.43
Newton County58,4700.50%93.59
Nodaway County21,699-7.27%24.74
Oregon County10,442-4.51%13.22
Osage County13,504-2.88%22.26
Ozark County9,486-2.67%12.73
Pemiscot County14,452-20.86%29.34
Perry County18,722-1.14%39.47
Pettis County42,033-0.57%61.61
Phelps County44,639-1.45%66.45
Pike County17,702-4.19%26.40
Platte County109,38021.94%260.31
Polk County31,9542.56%50.28
Pulaski County54,4372.99%99.50
Putnam County4,540-8.73%8.78
Ralls County10,5343.35%22.42
Randolph County24,796-2.60%51.37
Ray County23,237-1.19%40.85
Reynolds County6,234-6.62%7.71
Ripley County12,892-8.58%20.48
St. Charles County411,74813.80%734.69
St. Clair County9,421-4.09%13.96
Ste. Genevieve County17,945-1.00%35.95
St. Francois County68,6494.76%151.91
St. Louis County991,163-0.77%1,951.99
Saline County22,374-4.47%29.62
Schuyler County4,8589.39%15.81
Scotland County4,794-0.95%10.98
Scott County37,497-4.49%89.28
Shannon County8,097-4.10%8.07
Shelby County5,729-9.99%11.44
Stoddard County28,308-5.72%34.39
Stone County32,7051.46%70.48
Sullivan County5,657-16.03%8.73
Taney County56,5558.96%89.42
Texas County25,074-3.72%21.30
Vernon County20,776-1.81%25.14
Warren County38,29817.46%89.36
Washington County24,121-4.29%31.74
Wayne County12,096-10.53%15.93
Webster County40,83112.42%68.91
Worth County1,974-8.27%7.40
Wright County18,595-0.98%27.27
St. Louis City292,047-8.55%4,713.99