ZIP Code 42021

42021 is one of Kentucky's ZIP codes, delivering to addresses in Arlington, Carlisle County.

City: Arlington
County: Carlisle County
State: Kentucky
Prefix: 420xx

Where this code sits

42021 is part of the 420xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Arlington.

Arlington Kentucky ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 42021 delivers to without sharing its boundary.

ZIP codes nearest 42021

The ZIP codes whose reference points sit closest to 42021.
ZIP code	Distance	Delivers to
ZIP code 42023	5.1 mi	Bardwell, KY
ZIP code 42032	5.4 mi	Columbus, KY
ZIP code 42070	6.3 mi	Milburn, KY
ZIP code 42031	8.8 mi	Clinton, KY
ZIP code 42035	11 mi	Cunningham, KY
ZIP code 63881	12 mi	Wolf Island, MO
ZIP code 42039	12 mi	Fancy Farm, KY
ZIP code 42087	12 mi	Wickliffe, 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 42021, plotted from its record coordinates.

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

Scope ZIP code 42021. 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.