County ZIP codes · Texas · FIPS 48209
Hays County, TX ZIP Codes
Hays County, Texas has 14 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 13 residential and 1 for PO boxes or a single organization. 7 of the residential ones lie mainly in Hays County and 6 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $54,737 in 78666 (San Marcos) to $238,559 in 78739 (Austin) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Hays 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 $90,075 and $168,920.
They carry 11 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 13 residential ZIP codes in Hays County
7 ZIP codes lie mainly in Hays County; 6 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 78666 | San Marcos | 88,583 | 461 | $55k | $307k | 78% |
| 78640 | Kyle | 77,531 | 866 | $90k | $330k | 84% |
| 78610 | Buda | 48,319 | 499 | $120k | $408k | 71% |
| 78737 | Austin | 27,023 | 742 | $169k | $765k | 71% |
| 78620 | Dripping Springs | 22,860 | 130 | $154k | $677k | 85% |
| 78676 | Wimberley | 15,822 | 94 | $87k | $512k | 92% |
| 78619 | Driftwood | 6,693 | 168 | $183k | $811k | 100% |
Partly in Hays County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 78652 | Manchaca | 5,287 | 472 | $133k | $528k | 44% |
| 78623 | Fischer | 1,645 | 73 | $117k | $450k | 8% |
| 78739 | Austin | 20,659 | 1,783 | $239k | $809k | 8% |
| 78736 | Austin | 9,651 | 433 | $94k | $573k | 3% |
| 78656 | Maxwell | 2,847 | 100 | $81k | $238k | 3% |
| 78663 | Round Mountain | 503 | 5 | $168k | $357k | 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?
12 ZIP codes of Hays County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Hays | Elsewhere |
|---|---|---|
| 78666 | 78% | Guadalupe County16%; Comal County4%; Caldwell County2% |
| 78640 | 84% | Caldwell County15%; Travis County1% |
| 78610 | 71% | Travis County26%; Caldwell County2% |
| 78737 | 71% | Travis County29% |
| 78620 | 85% | Travis County10%; Blanco County5% |
| 78739 | 8% | Travis County92% |
| 78676 | 92% | Blanco County7% |
| 78736 | 3% | Travis County97% |
| 78652 | 44% | Travis County56% |
| 78656 | 3% | Caldwell County97% |
| 78623 | 8% | Comal County92% |
| 78663 | 2% | Blanco County93%; Travis County4% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 78667 | San Marcos |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Hays County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Hays County's ZIP codes use 2 prefixes: 786 and 787.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.