ZIP 78123 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 78123.
| County | Land in this ZIP | Documents held | On septic (county) | On sewer (county) |
|---|---|---|---|---|
| Guadalupe County, Texas | 100% | 11 | 36,043 | 31,861 |
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 78123 falls in Guadalupe County, Texas.