Dallam County, Texas
County seat: Dalhart · Population 7,508 (2025) · 1,503 sq mi
Dallam County is the 180th most populous of Texas's 254 counties, with 7,508 people (2025 estimate). Its county seat is Dalhart. It is part of the High Plains region, one of the 12 Texas Comptroller economic regions. The map shows its 2 cities and towns and the 5 neighboring counties.
Dallam County facts
- County seat
- Dalhart
- Population (2025 estimate)
- 7,508 +5.2% since 2020
- Land area
- 1,503 sq mi 18th largest of 254
- Water area
- 2 sq mi
- Population density
- 5 per sq mi
- Established
- 1876
- Named after
- James Wilmer Dallam American lawyer and newspaper publisher
- Largest city
- Dalhart 5,770 in the county
- Median household income
- $71,500
- Cities and towns
- 2
- ZIP codes
- 4
- Time zone
- Central
- FIPS code
- 48111
Cities and towns in Dallam County
Dallam County has 2 incorporated cities, towns and villages. Populations count the people living inside Dallam County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Dalhart (county seat) | City | 5,770 | Hartley County |
| Texline | Town | 492 |
ZIP codes in Dallam County
4 ZIP codes reach into Dallam County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 79022 also Hartley County
- 79051
- 79084 also Sherman County
- 79087
Population of Dallam County, 2020–2025
Dallam County grew by 373 people (+5.2%) between April 2020 and July 2025: 575 more births than deaths and a net loss of 212 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 7,137 |
| 2021 | 7,181 |
| 2022 | 7,247 |
| 2023 | 7,302 |
| 2024 | 7,447 |
| 2025 | 7,508 |
Neighboring counties
- Hartley County south · 4,904 people
- Cimarron County, Oklahoma north · 2,059 people
- Union County, New Mexico west · 3,844 people
- Sherman County east · 2,781 people
- Moore County southeast · 21,891 people
Printable Dallam County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (116 KB)
- PNG (2400 px) (49 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
Back to the Texas county map with all 254 counties. Found an error? Tell us.