Castro County, Texas
County seat: Dimmitt · Population 7,295 (2025) · 894 sq mi
Castro County is the 183rd most populous of Texas's 254 counties, with 7,295 people (2025 estimate). Its county seat is Dimmitt. It is part of the High Plains region, one of the 12 Texas Comptroller economic regions. The map shows its 3 cities and towns and the 6 neighboring counties.
Castro County facts
- County seat
- Dimmitt
- Population (2025 estimate)
- 7,295 −0.9% since 2020
- Land area
- 894 sq mi 156th largest of 254
- Water area
- 5 sq mi
- Population density
- 8 per sq mi
- Established
- 1876
- Named after
- Henri Castro American diplomat (1786-1865)
- Largest city
- Dimmitt 4,069
- Median household income
- $56,776
- Cities and towns
- 3 plus 1 CDPs
- ZIP codes
- 10
- Time zone
- Central
- FIPS code
- 48069
Cities and towns in Castro County
Castro County has 3 incorporated cities, towns and villages. Populations count the people living inside Castro County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Dimmitt (county seat) | City | 4,069 | |
| Hart | City | 865 | |
| Nazareth | City | 307 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Summerfield | 0 |
ZIP codes in Castro County
10 ZIP codes reach into Castro County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 79027 also Lamb County
- 79031 also Lamb County
- 79042 also Randall, Swisher and Armstrong counties
- 79043 also Lamb and Hale counties
- 79045 also Deaf Smith County
- 79052 also Swisher and Hale counties
- 79063
- 79085
- 79088 also Swisher and Briscoe counties
- 79347 also Bailey, Parmer and Lamb counties
Population of Castro County, 2020–2025
Castro County shrank by 68 people (−0.9%) between April 2020 and July 2025: 110 more births than deaths and a net loss of 185 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 7,324 |
| 2021 | 7,355 |
| 2022 | 7,285 |
| 2023 | 7,291 |
| 2024 | 7,343 |
| 2025 | 7,295 |
Neighboring counties
- Swisher County east · 6,703 people
- Parmer County west · 9,678 people
- Lamb County south · 12,579 people
- Deaf Smith County northwest · 18,626 people
- Randall County northeast · 152,351 people
- Hale County southeast · 31,819 people
Printable Castro 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) (125 KB)
- PNG (2400 px) (57 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.