ZIP Code 45051

45051 is one of Ohio's ZIP codes, delivering to addresses in Mount Saint Joseph, Hamilton County.

City: Mount Saint Joseph
County: Hamilton County
State: Ohio
Prefix: 450xx

Where this code sits

45051 is part of the 450xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Mount Saint Joseph.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 45051 delivers to without sharing its boundary.

ZIP codes nearest 45051

The ZIP codes whose reference points sit closest to 45051.
ZIP code	Distance	Delivers to
ZIP code 45233	1.3 mi	Cincinnati, OH
ZIP code 45238	1.9 mi	Cincinnati, OH
ZIP code 41025	2.6 mi	Erlanger, KY
ZIP code 41048	3.4 mi	Hebron, KY
ZIP code 45205	3.7 mi	Cincinnati, OH
ZIP code 45204	3.8 mi	Cincinnati, OH
ZIP code 45001	4.5 mi	Addyston, OH
ZIP code 45211	4.6 mi	Cincinnati, 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 45051, plotted from its record coordinates.

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

Scope ZIP code 45051. 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.