ZIP 78737 falls in Hays County, Texas, where we hold 56,993 parcels measured as septic county-wide and 32,829 on sewer. We do not have a per-ZIP parcel count for this county, so this is the county total, not a count specific to ZIP 78737.
ZCTA 78737 is not entirely inside one county. Land-area share is from the 2020 Census ZCTA-to-county relationship file.
| County | Land in this ZIP | Documents held | On septic (county) | On sewer (county) |
|---|---|---|---|---|
| Hays County, Texas | 71% | 2 | 56,993 | 32,829 |
| Travis County, Texas | 29% | 164,420 | 34,543 | 337,990 |
1 businesses on record with an address in this ZIP: pumping, installation, design, inspection and repair. Not an endorsement, and we take no fee.
| Company | City | Phone | Rating |
|---|---|---|---|
| Summit Excavation | Austin | (512) 775-5597 | 5.0 (3) |
Land-area overlap is from the 2020 Census Bureau ZCTA5-to-county relationship file, not an estimate of ours. Parcel and document counts are rows we hold, not a survey of every property in the ZIP. Last verified 2026-09-01.
We hold 56,993 parcels measured as septic for Hays County, Texas as a whole, not broken out by ZIP.
ZIP 78737 spans 2 counties: Hays County, Texas, Travis County, Texas.