Sedgwick County area

Population and density of Sedgwick County

The Census Bureau estimates that 538,433 people lived in Sedgwick County on July 1, 2025. That ranks #138 of 3,222 county equivalents nationally and #2 of 105 in Kansas. Since the April 1, 2020 estimates base of 523,844, the population has grown by 14,589 (+2.8%), compared with +1.3% for Kansas as a whole.

With 997 square miles of land, that is 540 people per square mile (209 per km²), placing Sedgwick County #323 nationally for density and #3 in Kansas. The median county equivalent has 47 people per square mile; the Kansas median is 8.1. Put another way, there are about 1.2 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Sedgwick County

20 incorporated places lie at least partly in Sedgwick County. Together they are home to 500,008 people (92.9%); the other 38,425 (7.1%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Wichita city, with 400,987 residents in the county. Among places with at least 1,000 residents in 2020, Maize city grew fastest since then (+36.8%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Sedgwick County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Sedgwick County is a central county of the Wichita, KS Metropolitan Statistical Area. Its 4 county equivalents have 663,809 residents on 4,148.1 square miles of land; Sedgwick County accounts for 24% of the land and 81.1% of the residents. By combined land it ranks #70 of 393 metropolitan areas, and #91 by population. It belongs to the Wichita-Arkansas City-Winfield, KS Combined Statistical Area.

ZIP codes

52 ZIP Code Tabulation Areas have land in Sedgwick County; 43 of them have most of their land inside the county, and the others mainly cover neighboring areas.

67001670166701767020670256702667030670316703767050670526705567060670676710167106671086711067118671206713367135671476714967202672036720467205672066720767208672096721067211672126721367214672156721667217672186721967220672216722367226672276722867230672326723567260

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Sedgwick County

Sedgwick County shares a land border with 5 county equivalents. It has more land than 2 of them. The largest neighbor is Butler County (1,429.7 mi²) and the smallest is Harvey County (539.8 mi²). Together with its neighbors, Sedgwick County forms a block of 6,266.9 mi² of land, of which it holds 15.9%.

How big is Sedgwick County compared with U.S. states?

Sedgwick County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1 times as much. Kansas’s county land could hold about 82 areas the size of Sedgwick County.

Another way to picture it: the same land area would fill a square about 31.6 miles (50.8 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Sedgwick County?

Sedgwick County has more land than 2,536 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Sedgwick County at #762 nationally by total area, 76 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 1.2%, compared with a national county-equivalent median of 1.2%. The two percentages are within 0.1 percentage points of each other. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Sedgwick County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.