Thomas County, Kansas

Thomas County, Kansas, has 7,725 residents (July 2025 estimate). Its county seat is Colby. It uses Central Time and covers 1,075 sq mi (2,783 km²) of land.

Thomas County in Kansas

Thomas County and its neighbors (simplified outlines). Open in OpenStreetMap ↗

Resident population, July 2025: 7,725
Land area: 1,075 sq mi (2,783 km²)
County seat or government: Colby
Time zone: Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income: $71,325 ± $9,792
Median home value: $172,700 ± $16,455
Median rent, with utilities: $752 ± $90
Homes lived in by their owners: 75.2% ± 3.0 points
County type: County
Metro or micro area: Outside any metro or micro area
Water area: 0.11 sq mi (0.29 km²)
State: Kansas
County code (FIPS): 20193
Coordinates (central point): 39.357713, -101.083386

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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 Thomas County

Time zone	Local time and UTC offset	Next clock change
Central TimeAmerica/Chicago	UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.	Enable JavaScript for upcoming changes.

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ZIP Code areas, largest first

677016,134 people
677482,637 people
67732691 people
67753407 people
67764401 people
67743200 people
67734175 people
67747151 people

8 ZIP Code areas overlap Thomas 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

Thomas County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Thomas County, largest first

All 13

Barrett Township16 people

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

School districts in Thomas County, largest first

Colby Public Schools Unified School District 3156,381 people
Oakley Unified School District 2742,737 people
Brewster Unified School District 314736 people
Golden Plains Unified School District 316717 people
Grinnell Public Schools Unified School District 291615 people
Triplains Unified School District 275526 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.

Bordering areas, nearest first

Distances are straight lines between map points.

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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.