ZIP 37640 falls in Johnson County, Tennessee, where we hold 7,022 parcels measured as septic county-wide and 1,254 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 37640.
ZCTA 37640 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) |
|---|---|---|---|---|
| Johnson County, Tennessee | 64% | 6,377 | 7,022 | 1,254 |
| Carter County, Tennessee | 36% | 4,949 | 12,231 | 8,446 |
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 7,022 parcels measured as septic for Johnson County, Tennessee as a whole, not broken out by ZIP.
ZIP 37640 spans 2 counties: Johnson County, Tennessee, Carter County, Tennessee.