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What are the largest counties in Missouri?

St. Louis County is the largest county in Missouri, with 990,911 residents in 2025 (Census PEP). Jackson County (732,994) and St. Charles County (426,499) come next.

Data as of 2025 · updated

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All 115 ranked Missouri counties

Missouri counties ranked by population
RankCountyResidents 2025Change 2020–25
1St. Louis County990,911−1.2%
2Jackson County732,994+2.1%
3St. Charles County426,499+4.9%
4Greene County309,286+3.3%
5St. Louis (city)278,144−7.4%
6Clay County265,032+4.3%
7Jefferson County233,132+2.7%
8Boone County191,746+4.2%
9Jasper County127,428+3.7%
10Cass County115,859+7.1%
11Platte County114,400+6.7%
12Franklin County108,090+3.1%
13Christian County96,725+8.3%
14Cape Girardeau County83,999+2.7%
15Buchanan County83,540−1.1%
16Cole County77,908+1.7%
17St. Francois County67,809+2.1%
18Lincoln County66,676+11.4%
19Newton County62,263+6.1%
20Taney County57,001+1.7%
21Johnson County56,670+4.9%
22Pulaski County54,442+0.8%
23Callaway County45,765+3.2%
24Phelps County45,247+1.6%
25Pettis County44,254+2.9%
26Camden County44,047+2.9%
27Webster County43,054+10.4%
28Butler County41,904−0.4%
29Howell County40,798+2.5%
30Lawrence County39,401+3.7%
31Warren County39,016+9.2%
32Scott County37,975−0.1%
33Laclede County36,943+2.5%
34Barry County36,200+4.8%
35Polk County33,604+6.3%
36Lafayette County33,531+1.4%
37Stone County32,503+4.1%
38Marion County28,525+0.2%
39Stoddard County28,284−1.3%
40Dunklin County26,855−4.8%
41Texas County25,994+6.9%
42Miller County25,817+4.2%
43Adair County25,684+1.6%
44Audrain County24,528−1.0%
45Randolph County24,513+0.2%
46McDonald County23,992+3.1%
47Washington County23,810+1.6%
48Ray County23,398+1.1%
49Saline County23,265−0.3%
50Crawford County22,929−0.4%
51Henry County22,671+3.2%
52Morgan County22,418+6.8%
53Clinton County21,661+2.1%
54Benton County20,536+5.7%
55Nodaway County20,174−4.0%
56Vernon County19,946+1.5%
57Wright County19,671+8.0%
58Perry County19,093+0.6%
59Ste. Genevieve County18,689+1.1%
60Andrew County18,241+0.7%
61Dallas County18,025+5.2%
62Pike County17,955+3.1%
63Cooper County17,136+3.0%
64Bates County16,512+2.9%
65Moniteau County15,428+1.3%
66Macon County15,190−0.1%
67New Madrid County15,086−7.6%
68Cedar County14,888+4.8%
69Gasconade County14,784+0.1%
70Livingston County14,708+1.1%
71Dent County14,584+1.3%
72Pemiscot County14,465−7.2%
73Osage County13,611+2.7%
74Madison County12,858+1.9%
75Douglas County12,342+6.4%
76Mississippi County12,003−1.1%
77Linn County11,815−0.3%
78Barton County11,795+1.5%
79Montgomery County11,590+2.6%
80Wayne County10,782−1.4%
81Ripley County10,717+0.4%
82Bollinger County10,646+0.9%
83Ralls County10,444+0.9%
84Howard County10,180+0.3%
85St. Clair County9,976+6.7%
86Lewis County9,879−1.6%
87DeKalb County9,795−15.6%
88Grundy County9,744−0.2%
89Iron County9,318−2.0%
90Ozark County9,172+7.7%
91Hickory County9,044+8.9%
92Caldwell County9,012+2.1%
93Monroe County8,959+3.1%
94Oregon County8,709+1.2%
95Daviess County8,558+1.5%
96Carroll County8,417−0.6%
97Maries County8,397−0.7%
98Harrison County8,281+1.5%
99Dade County7,804+2.9%
100Chariton County7,377−0.1%
101Shannon County7,285+3.6%
102Clark County6,475−2.8%
103Gentry County6,384+4.2%
104Reynolds County5,992−1.4%
105Shelby County5,870−3.6%
106Sullivan County5,738−4.1%
107Carter County5,418+4.2%
108Atchison County5,175−2.5%
109Scotland County4,796+2.1%
110Putnam County4,546−3.0%
111Holt County4,200+0.4%
112Schuyler County4,140+3.3%
113Knox County3,728−0.1%
114Mercer County3,404−3.2%
115Worth County1,914−2.6%

How this is ranked

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025). Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how ranks and figures are built.

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Questions

What is the largest county in Missouri?

St. Louis County is the largest county in Missouri, with 990,911 residents in 2025 (Census PEP). Jackson County (732,994) and St. Charles County (426,499) come next.

How is this ranking calculated?

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

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