ZIP Code 45018

45018 is one of Ohio's ZIP codes, delivering to addresses in Fairfield, Butler County.

City: Fairfield
County: Butler County
State: Ohio
Prefix: 450xx

Where this code sits

45018 is part of the 450xx range, the group of codes handled by one mail processing centre. Fairfield is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Fairfield page.

Fairfield Ohio ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 45018 delivers to without sharing its boundary.

ZIP codes nearest 45018

The ZIP codes whose reference points sit closest to 45018.
ZIP code	Distance	Delivers to
ZIP code 45012	0.0 mi	Hamilton, OH
ZIP code 45013	2.3 mi	Hamilton, OH
ZIP code 45062	2.9 mi	Seven Mile, OH
ZIP code 45055	3.3 mi	Overpeck, OH
ZIP code 45011	3.8 mi	Hamilton, OH
ZIP code 45004	5.4 mi	Collinsville, OH
ZIP code 45015	6.6 mi	Hamilton, OH
ZIP code 45067	6.7 mi	Trenton, 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 45018, plotted from its record coordinates.

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

Scope ZIP code 45018. 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.