ZIP Code 37742

37742 is one of Tennessee's ZIP codes, delivering to addresses in Greenback, Loudon County.

City: Greenback
County: Loudon County
State: Tennessee
Prefix: 377xx

Where this code sits

37742 is part of the 377xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Greenback.

Greenback Tennessee ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 37742 delivers to without sharing its boundary.

865 Area code 865

ZIP codes nearest 37742

The ZIP codes whose reference points sit closest to 37742.
ZIP code	Distance	Delivers to
ZIP code 37801	5.7 mi	Maryville, TN
ZIP code 37737	7.5 mi	Friendsville, TN
ZIP code 37885	8.4 mi	Vonore, TN
ZIP code 37772	9.5 mi	Lenoir City, TN
ZIP code 37803	9.8 mi	Maryville, TN
ZIP code 37774	11 mi	Loudon, TN
ZIP code 37878	11 mi	Tallassee, TN
ZIP code 37771	12 mi	Lenoir City, TN

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 37742, plotted from its record coordinates.

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

Scope ZIP code 37742. 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.