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County ZIP codes · Kansas · FIPS 20193

Thomas County, KS ZIP Codes

Thomas County, Kansas has 8 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 5 of the residential ones lie mainly in Thomas County and 3 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $70,250 in 67701 (Colby) to $78,083 in 67748 (Oakley) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Thomas County?

67701 · Colby: $70k67732 · Brewster: $65k67734 · Gem: –67743 · Levant: $57k67747 · Monument: $75k67748 · Oakley: $78k67753 · Rexford: $62k67764 · Winona: $66k677646770167748677326775367743677476773467701 · Colby: $70k67732 · Brewster: $65k67734 · Gem: –67743 · Levant: $57k67747 · Monument: $75k67748 · Oakley: $78k67753 · Rexford: $62k67764 · Winona: $66k677646770167748677326775367743677476773467701 · Colby: $70k67732 · Brewster: $65k67734 · Gem: –67743 · Levant: $57k67747 · Monument: $75k67748 · Oakley: $78k67753 · Rexford: $62k67764 · Winona: $66k67764677016774867732677536774767734
The residential ZIP codes of Thomas County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024).<$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

They carry 8 postal town names: Colby, Oakley, Brewster, Rexford, Winona, Levant, Gem, Monument.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 8 residential ZIP codes in Thomas County

5 ZIP codes lie mainly in Thomas County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Thomas County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
67701 Colby 6,134 14 $70k $177k 87%
67732 Brewster 691 2 $65k $144k 50%
67753 Rexford 407 2 $62k $123k 53%
67743 Levant 200 1 $57k – 90%
67734 Gem 175 2 – – 59%

Partly in Thomas County

Residential ZIP codes mainly in another county that reach at least 1% into Thomas County, by their share here
In this county
67748 Oakley 2,637 6 $78k $137k 34%
67747 Monument 151 1 $75k $158k 7%
67764 Winona 401 1 $66k $105k 6%

Download the 8 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

8 ZIP codes of Thomas County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Thomas County and in the neighboring counties
ZIPIn ThomasElsewhere
6770187%Rawlins County13%
6774834%Logan County41%; Gove County23%; Sheridan County2%
6773250%Sherman County27%; Logan County13%; Rawlins County10%
6775353%Sheridan County32%; Rawlins County15%
677646%Logan County94%
6774390%Rawlins County10%
6773459%Rawlins County41%
677477%Logan County93%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Thomas County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Thomas County starts with 677.

Three-digit prefixes of Thomas County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Thomas County's
PrefixSectional centerHereAll codes
677North Platte, NE (SCF 691)828

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.