ZIP Code 42123

42123 is one of Kentucky's ZIP codes, delivering to addresses in Austin, Barren County.

City: Austin
County: Barren County
State: Kentucky
Prefix: 421xx

Where this code sits

42123 is part of the 421xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Austin.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 42123 delivers to without sharing its boundary.

ZIP codes nearest 42123

The ZIP codes whose reference points sit closest to 42123.
ZIP code	Distance	Delivers to
ZIP code 42131	3.7 mi	Etoile, KY
ZIP code 42156	4.6 mi	Lucas, KY
ZIP code 42133	6.6 mi	Fountain Run, KY
ZIP code 42157	9.6 mi	Mount Hermon, KY
ZIP code 42153	11 mi	Holland, KY
ZIP code 42164	12 mi	Scottsville, KY
ZIP code 42141	13 mi	Glasgow, KY
ZIP code 42142	13 mi	Glasgow, 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 42123, plotted from its record coordinates.

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

Scope ZIP code 42123. 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.