Kansas Counties, Demographics & Geography
Complete official guide to all 105 counties in Kansas (KS). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Kansas County Breakdown
Showing 6 of 6 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| Johnson County | 20091 | Olathe | 609,863 | 473 sq mi | Lookup |
| Sedgwick County | 20173 | Wichita | 523,824 | 1,000 sq mi | Lookup |
| Shawnee County | 20177 | Topeka | 178,909 | 550 sq mi | Lookup |
| Wyandotte County | 20209 | Kansas City | 169,245 | 151 sq mi | Lookup |
| Douglas County | 20045 | Lawrence | 118,785 | 457 sq mi | Lookup |
| Leavenworth County | 20103 | Leavenworth | 81,881 | 463 sq mi | Lookup |
Geographic Structure of Kansas Counties
County Administration & Governance
In Kansas, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Olathe and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Kansas counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (20) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:Johnson County (609,863 residents)
- Largest by Land Area:Sedgwick County (1,000 sq mi)
- State Capital:Topeka
- Census Bureau Region:Midwest United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.