Plain

County ZIP codes · Texas · FIPS 48111

Dallam County, TX ZIP Codes

Dallam County, Texas has 4 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 3 of the residential ones lie mainly in Dallam County and 1 mainly in a neighboring county; 2 cross the county line.

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Dallam County?

79022 · Dalhart: $72k79051 · Kerrick: –79084 · Stratford: $55k79087 · Texline: $69k7902279084790877905179022 · Dalhart: $72k79051 · Kerrick: –79084 · Stratford: $55k79087 · Texline: $69k7902279084790877905179022 · Dalhart: $72k79051 · Kerrick: –79084 · Stratford: $55k79087 · Texline: $69k79022790847908779051
The residential ZIP codes of Dallam 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).

All 4 residential ZIP codes in Dallam County

3 ZIP codes lie mainly in Dallam County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in Dallam County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
79022 Dalhart 10,826 6 $72k $172k 58%
79087 Texline 813 3 $69k $103k 100%
79051 Kerrick 9 0 – – 100%

Partly in Dallam County

Residential ZIP codes mainly in another county that reach at least 1% into Dallam County, by their share here
In this county
79084 Stratford 1,595 4 $55k $135k 3%

Download the 4 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?

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

Share of each ZIP code's land in Dallam County and in the neighboring counties
ZIPIn DallamElsewhere
7902258%Hartley County42%
790843%Sherman County97%

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

Which first three digits do Dallam 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 Dallam County starts with 790.

Three-digit prefixes of Dallam 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 Dallam County's
PrefixSectional centerHereAll codes
790Amarillo, TX (SCF 790)474

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