ZIP Code 42157

42157 is one of Kentucky's ZIP codes, delivering to addresses in Mount Hermon, Monroe County.

City: Mount Hermon
County: Monroe County
State: Kentucky
Prefix: 421xx

Where this code sits

42157 is part of the 421xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Mount Hermon.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 42157 delivers to without sharing its boundary.

ZIP codes nearest 42157

The ZIP codes whose reference points sit closest to 42157.
ZIP code	Distance	Delivers to
ZIP code 42131	6.1 mi	Etoile, KY
ZIP code 42167	7.4 mi	Tompkinsville, KY
ZIP code 42133	8.2 mi	Fountain Run, KY
ZIP code 42140	8.2 mi	Gamaliel, KY
ZIP code 42123	9.6 mi	Austin, KY
ZIP code 42130	10 mi	Eighty Eight, KY
ZIP code 42166	10 mi	Summer Shade, KY
ZIP code 42124	12 mi	Beaumont, KY

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 42157, plotted from its record coordinates.

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

Scope ZIP code 42157. 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.