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Where am ILOCATED

Jefferson County, Kansas

Jefferson County, Kansas, has 18,296 residents (July 2025 estimate). Its county seat is Oskaloosa. It uses Central Time and covers 533 sq mi (1,379 km²) of land.

WichitaOverland Park
Jefferson County in Kansas
Jackson CountyLeavenworth CountyShawnee CountyValley FallsOskaloosaPerryMeriden
Jefferson County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
18,296
Land area
533 sq mi (1,379 km²)
County seat or government
Oskaloosa
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$81,278 ± $4,961
Median home value
$216,900 ± $9,772
Median rent, with utilities
$835 ± $64
Homes lived in by their owners
85.7% ± 2.6 points
County type
County
Metro or micro area
Topeka, KS metro areaOutlying county
Water area
24.1 sq mi (62.3 km²)
State
Kansas
County code (FIPS)
20087
Coordinates (central point)
39.239644, -95.375314
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Jefferson County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 6604428,820 people
  2. 6600213,276 people
  3. 6608610,940 people
  4. 666178,903 people
  5. 664365,537 people
  6. 665123,678 people
  7. 660542,777 people
  8. 660882,697 people
  9. 660662,432 people
  10. 660732,263 people
  11. 660701,944 people
  12. 660601,325 people
All 15
  1. 66097995 people
  2. 66419600 people
  3. 66429379 people

15 ZIP Code areas overlap Jefferson County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Jefferson County, largest first

  1. Rock Creek Township2,778 people
  2. Delaware Township2,211 people
  3. Oskaloosa Township2,058 people
  4. Union Township1,976 people
  5. Kentucky Township1,775 people
  6. Ozawkie Township1,405 people
  7. Fairview Township1,400 people
  8. Kaw Township1,212 people
  9. Norton Township1,076 people
  10. Jefferson Township996 people
  11. Sarcoxie Township976 people
  12. Rural Township486 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Kansas, by county

School districts in Jefferson County, largest first

  1. Lawrence Unified School District 49799,700 people
  2. Seaman Unified School District 34520,653 people
  3. Perry Public Schools Unified School District 3436,215 people
  4. Holton Unified School District 3365,863 people
  5. Jefferson West Unified School District 3405,063 people
  6. Atchison County Community Schools Unified School District 3774,595 people
  7. Easton Unified School District 4493,602 people
  8. Oskaloosa Public Schools Unified School District 3413,216 people
  9. McLouth Unified School District 3423,056 people
  10. Valley Falls Unified School District 3382,564 people
  11. Jefferson County North Unified School District 3392,413 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Valley Falls, Kansas (city)1,382 people
  2. Oskaloosa, Kansas (city)1,113 people
  3. Perry, Kansas (city)1,069 people
  4. McLouth, Kansas (city)864 people
  5. Meriden, Kansas (city)716 people
  6. Nortonville, Kansas (city)715 people
  7. Ozawkie, Kansas (city)604 people
  8. Winchester, Kansas (city)417 people
  9. Grantville, Kansas (CDP)122 people
  10. Williamstown, Kansas (CDP)31 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Leavenworth County, Kansas18 mi east
  2. Atchison County, Kansas21 mi north
  3. Douglas County, Kansas24 mi south
  4. Shawnee County, Kansas25 mi southwest
  5. Jackson County, Kansas25 mi northwest

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.