Fairfield Ohio ZIP Codes

Fairfield holds 2 ZIP codes, all inside one county and one postal prefix.

Every ZIP code in Fairfield

The complete list of Fairfield, Ohio ZIP codes with the county each falls in.
ZIP code	County
45014	Butler County
45018	Butler County

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Fairfield codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Fairfield. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Fairfield ZIP code begins 450. Those first three digits identify the sectional center facility that processes mail for this part of Ohio. Statewide that range covers 39 ZIP codes, so Fairfield accounts for 5% of it.

Every Ohio ZIP prefix and the region it covers →

Area codes covering Fairfield

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Fairfield occupies.

Fairfield Ohio area codes in full →

Where Fairfield's ZIP codes sit

Each point is one Fairfield ZIP code, plotted from its record coordinates.

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

Cities near Fairfield

The closest places to Fairfield with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Hamilton Ohio ZIP codes	4.5 mi	4 ZIP codes
West Chester Ohio ZIP codes	7.4 mi	2 ZIP codes
Seven Mile Ohio ZIP codes	11 mi	1 ZIP code
Dillonvale Ohio ZIP codes	11 mi	1 ZIP code
Trenton Ohio ZIP codes	11 mi	1 ZIP code
Monroe Ohio ZIP codes	12 mi	1 ZIP code
Mason Ohio ZIP codes	13 mi	1 ZIP code
Cincinnati Ohio ZIP codes	13 mi	71 ZIP codes

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.