ZIP 78124 falls in Guadalupe County, Texas, where we hold 36,043 parcels measured as septic county-wide and 31,861 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 78124.
ZCTA 78124 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) |
|---|---|---|---|---|
| Guadalupe County, Texas | 88% | 11 | 36,043 | 31,861 |
| Bexar County, Texas | 12% | — | 20,309 | 684,891 |
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 |
|---|---|---|---|
| Bulldog Septic | Marion | (830) 583-7867 | 4.8 (9) |
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 36,043 parcels measured as septic for Guadalupe County, Texas as a whole, not broken out by ZIP.
ZIP 78124 spans 2 counties: Guadalupe County, Texas, Bexar County, Texas.