ZIP Codes of Thomas County, KS

Population & People
Population & People
Total Population
7,607
Household Income
Household Income
Median Income
$63,624
Housing
Housing
Total Housing Units
3,525
Business & Economy
Business & Economy
Total Businesses
324
Employment
Employment
Employment Rate
71.90%
Education
Education
Bachelor's Degree+
35.20%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 5 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:5 ZIP Codes (5 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:785
Timezone:Central (GMT -06:00)
Local Time:2:12:15 PM
Population:7,607 [See All]
FIPS:20193
Land Area:1,287 sq mi
Water Area:0 sq mi
Coordinates:39.4221, -101.0547
Quick Link:
https://www.zip-codes.com/county/ks-thomas.asp
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Kansas's #49 most populous county
7,607 residents across 5 ZIPs — #49 of 106 Kansas counties.

Standout ZIPs in this County


Most Populous
Colby · 6,134 people
80.6% of county total
Highest Income
Colby · $70,250 median
1.1× county average
Largest Land Area
Colby · 425.2 sq mi
Spans the most ground
Fastest Growth
Colby · -6.8% (10-yr)
6,580 → 6,134 residents
Most Educated
Colby · 38.3% bachelor's+
1,451 of 3,789 adults 25+

Things worth knowing about Thomas County


7,607 residents live across 5 ZIPs covering 1,287 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 7,930 to 7,607 from 2014 to 2024 — a -4.1% change. 2 ZIPs gained residents, 3 lost.

The county's wealthiest ZIP 67701 (Colby, $70,250 median) and poorest ZIP 67743 (Levant, $56,910) are 11.1 miles apart — a 1.2× income gap across local geography.

Median home values vary 1.4× across this county — from $122,800 in 67753 (Rexford) to $177,300 in 67701 (Colby).

Density varies 12× across the county — from 1 people/sq mi in 67743 (Levant) to 14 in 67701 (Colby).

Educational attainment ranges from 17.2% bachelor's+ in 67743 (Levant) to 38.3% in 67701 (Colby) — the breadth of educational profiles across the area.

Within Kansas, this is the #49 most populous of 106 counties and ranks #69 for median household income .

Weighted by population, the typical household earns about $68,967 across the county — reflecting what a typical resident sees, not a simple ZIP average.

35.2% of adults age 25+ hold a bachelor's degree or higher (1,650 of 4,687 reporting).

5 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Thomas County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
1,287
square miles
Avg density
5.9
people per sq mi
Population
7,607
across 5 ZIPs
Colby
425.2 sq mi
6,134 residents
Brewster
368.2 sq mi
691 residents
Rexford
245.4 sq mi
407 residents

Single-ZIP anchor

One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.

Colby

All ZIP Codes in Thomas County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
67701ColbyStandard6,134$70,250425.2-6.8%
67732BrewsterStandard691$64,938368.250.9%
67753RexfordStandard407$62,396245.4-28.2%
67743LevantStandard200$56,910160.173.9%
67734GemStandard17587.9-16.7%

Adjacent & Nearby Counties