ZIP Code 45123

45123 is one of Ohio's ZIP codes, delivering to addresses in Greenfield, Highland County.

City: Greenfield
County: Highland County
State: Ohio
Prefix: 451xx

Where this code sits

45123 is part of the 451xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Greenfield.

Greenfield Ohio ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 45123 delivers to without sharing its boundary.

ZIP codes nearest 45123

The ZIP codes whose reference points sit closest to 45123.
ZIP code	Distance	Delivers to
ZIP code 45681	7.0 mi	South Salem, OH
ZIP code 45135	8.5 mi	Leesburg, OH
ZIP code 45628	10 mi	Frankfort, OH
ZIP code 45132	11 mi	Highland, OH
ZIP code 45612	11 mi	Bainbridge, OH
ZIP code 45624	12 mi	Cynthiana, OH
ZIP code 45617	13 mi	Bourneville, OH
ZIP code 43160	14 mi	Washington Court House, OH

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 45123, plotted from its record coordinates.

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

Scope ZIP code 45123. 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.