ZIP 37779 falls in Union County, Tennessee, where we hold 6,762 parcels measured as septic county-wide and 1,198 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 37779.
ZCTA 37779 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) |
|---|---|---|---|---|
| Union County, Tennessee | 96% | 6,766 | 6,762 | 1,198 |
| Knox County, Tennessee | 4% | 100 | 1,532 | 91,171 |
| Grainger County, Tennessee | 0% | — | 9,035 | 1,387 |
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 6,762 parcels measured as septic for Union County, Tennessee as a whole, not broken out by ZIP.
ZIP 37779 spans 3 counties: Union County, Tennessee, Knox County, Tennessee, Grainger County, Tennessee.