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What are the largest counties in Kansas?

Johnson County is the largest county in Kansas, with 636,906 residents in 2025 (Census PEP). Sedgwick County (538,433) and Shawnee County (178,607) come next.

Data as of 2025 · updated

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All 105 ranked Kansas counties

Kansas counties ranked by population
RankCountyResidents 2025Change 2020–25
1Johnson County636,906+4.2%
2Sedgwick County538,433+2.6%
3Shawnee County178,607−0.1%
4Wyandotte County170,597+1.0%
5Douglas County120,920+1.8%
6Leavenworth County84,590+3.2%
7Riley County72,598+0.8%
8Butler County69,484+3.1%
9Reno County61,539−0.6%
10Saline County53,377−1.6%
11Crawford County39,008+0.1%
12Finney County37,505−2.1%
13Geary County36,338−1.2%
14Miami County36,240+5.9%
15Cowley County34,382−0.4%
16Ford County33,993−0.6%
17Harvey County33,580−1.2%
18Lyon County32,266+0.5%
19Montgomery County30,177−3.9%
20McPherson County30,064−0.4%
21Ellis County29,075+0.4%
22Pottawatomie County27,186+6.9%
23Franklin County26,299+1.1%
24Barton County24,790−2.5%
25Sumner County22,312−0.1%
26Seward County21,073−3.6%
27Labette County19,685−2.4%
28Cherokee County19,105−1.0%
29Dickinson County18,637+1.4%
30Jefferson County18,296−0.2%
31Atchison County16,172−0.9%
32Osage County15,693−0.3%
33Neosho County15,637−1.8%
34Bourbon County14,319−0.1%
35Jackson County13,438+1.5%
36Allen County12,302−1.8%
37Marion County11,634−1.3%
38Nemaha County10,054−2.1%
39Linn County9,950+3.7%
40Marshall County9,852−1.7%
41Rice County9,266−1.2%
42Pratt County9,117−0.3%
43Brown County9,104−4.0%
44Cloud County8,833−2.0%
45Coffey County8,467+1.3%
46Wilson County8,299−3.3%
47Anderson County8,018+2.3%
48Clay County7,990−1.7%
49Thomas County7,725−2.5%
50Doniphan County7,594+1.6%
51Kingman County7,029−5.4%
52Grant County7,028−4.1%
53Wabaunsee County7,018+1.8%
54Russell County6,581−1.4%
55Ellsworth County6,257−1.7%
56Pawnee County5,991−4.2%
57Greenwood County5,826−2.3%
58Sherman County5,763−2.4%
59Ottawa County5,744+0.3%
60Gray County5,652+0.1%
61Mitchell County5,590−3.2%
62Washington County5,533−0.2%
63Harper County5,370−1.8%
64Morris County5,348−0.3%
65Norton County5,288−3.0%
66Stevens County4,984−4.9%
67Scott County4,815−6.3%
68Phillips County4,728−4.9%
69Rooks County4,646−4.9%
70Republic County4,640−0.8%
71Barber County4,083−2.9%
72Stafford County4,005−1.4%
73Kearny County3,888−2.0%
74Meade County3,852−5.1%
75Haskell County3,599−4.2%
76Smith County3,566+0.0%
77Chautauqua County3,321−1.9%
78Osborne County3,285−5.8%
79Woodson County3,118+0.7%
80Lincoln County2,861−3.0%
81Rush County2,845−3.2%
82Jewell County2,830−3.3%
83Trego County2,740−2.5%
84Decatur County2,716−1.7%
85Logan County2,661−3.0%
86Edwards County2,640−8.6%
87Gove County2,631−3.0%
88Ness County2,617−2.1%
89Cheyenne County2,604−0.3%
90Chase County2,572−0.1%
91Hamilton County2,500+0.4%
92Morton County2,470−8.4%
93Elk County2,458−0.9%
94Kiowa County2,432−1.0%
95Rawlins County2,431−5.3%
96Sheridan County2,427−0.8%
97Graham County2,371−1.5%
98Wichita County2,031−5.5%
99Stanton County1,986−4.5%
100Clark County1,900−3.8%
101Comanche County1,673−0.4%
102Hodgeman County1,619−7.0%
103Lane County1,508−3.8%
104Wallace County1,441−4.7%
105Greeley County1,182−7.4%

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 Kansas?

Johnson County is the largest county in Kansas, with 636,906 residents in 2025 (Census PEP). Sedgwick County (538,433) and Shawnee County (178,607) 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.

More rankings for Kansas

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