ZIP 37656 falls in Washington County, Tennessee, where we hold 17,810 parcels measured as septic county-wide and 24,967 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 37656.
ZCTA 37656 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) |
|---|---|---|---|---|
| Washington County, Tennessee | 63% | — | 17,810 | 24,967 |
| Greene County, Tennessee | 29% | — | 20,900 | 9,046 |
| Sullivan County, Tennessee | 8% | — | 17,579 | 40,025 |
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 17,810 parcels measured as septic for Washington County, Tennessee as a whole, not broken out by ZIP.
ZIP 37656 spans 3 counties: Washington County, Tennessee, Greene County, Tennessee, Sullivan County, Tennessee.