ZIP Code 37640

37640 is one of Tennessee's ZIP codes, delivering to addresses in Butler, Johnson County.

City: Butler
County: Johnson County
State: Tennessee
Prefix: 376xx

Where this code sits

37640 is part of the 376xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Butler.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 37640 delivers to without sharing its boundary.

ZIP codes nearest 37640

The ZIP codes whose reference points sit closest to 37640.
ZIP code	Distance	Delivers to
ZIP code 28679	9.1 mi	Sugar Grove, NC
ZIP code 28622	11 mi	Elk Park, NC
ZIP code 37687	12 mi	Roan Mountain, TN
ZIP code 37643	12 mi	Elizabethton, TN
ZIP code 37658	12 mi	Hampton, TN
ZIP code 37644	13 mi	Elizabethton, TN
ZIP code 37691	13 mi	Trade, TN
ZIP code 28692	13 mi	Vilas, NC

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 37640, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 37640. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.