ZIP Code 37031

37031 is one of Tennessee's ZIP codes, delivering to addresses in Castalian Springs, Sumner County.

City: Castalian Springs
County: Sumner County
State: Tennessee
Prefix: 370xx

Where this code sits

37031 is part of the 370xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Castalian Springs.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 37031 delivers to without sharing its boundary.

ZIP codes nearest 37031

The ZIP codes whose reference points sit closest to 37031.
ZIP code	Distance	Delivers to
ZIP code 37066	7.8 mi	Gallatin, TN
ZIP code 37074	7.9 mi	Hartsville, TN
ZIP code 37022	9.5 mi	Bethpage, TN
ZIP code 37087	12 mi	Lebanon, TN
ZIP code 37088	12 mi	Lebanon, TN
ZIP code 37186	14 mi	Westmoreland, TN
ZIP code 37057	15 mi	Dixon Springs, TN
ZIP code 37071	16 mi	Gladeville, 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 37031, plotted from its record coordinates.

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

Scope ZIP code 37031. 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.