County ZIP codes · Texas · FIPS 48069
Castro County, TX ZIP Codes
Castro County, Texas has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 4 of the residential ones lie mainly in Castro County and 6 mainly in a neighboring county; 7 cross the county line. Median household income ranges from $57,956 in 79043 (Hart) to $70,590 in 79042 (Happy) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Castro County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $57,956 and $66,792.
They carry 10 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 10 residential ZIP codes in Castro County
4 ZIP codes lie mainly in Castro County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 79027 | Dimmitt | 4,858 | 14 | $51k | $91k | 99% |
| 79043 | Hart | 1,462 | 9 | $58k | $60k | 82% |
| 79063 | Nazareth | 665 | 8 | $111k | $249k | 100% |
| 79085 | Summerfield | no residents | 0 | – | – | 100% |
Partly in Castro County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 79042 | Happy | 1,218 | 3 | $71k | $149k | 23% |
| 79045 | Hereford | 18,189 | 16 | $61k | $117k | 16% |
| 79031 | Earth | 1,156 | 11 | $44k | $97k | 7% |
| 79052 | Kress | 1,101 | 5 | $35k | $100k | 3% |
| 79347 | Muleshoe | 7,176 | 10 | $67k | $106k | 3% |
| 79088 | Tulia | 5,302 | 9 | $36k | $83k | 2% |
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 Castro County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Castro | Elsewhere |
|---|---|---|
| 79045 | 16% | Deaf Smith County84% |
| 79347 | 3% | Bailey County78%; Parmer County15%; Lamb County4% |
| 79088 | 2% | Swisher County85%; Briscoe County13% |
| 79027 | 99% | |
| 79043 | 82% | Lamb County13%; Hale County6% |
| 79042 | 23% | Randall County48%; Swisher County22%; Armstrong County7% |
| 79031 | 7% | Lamb County93% |
| 79052 | 3% | Swisher County88%; Hale County9% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do Castro County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Castro County's ZIP codes use 2 prefixes: 790 and 793.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.