Mercer County ZIP Codes

Mercer County is a county of Ohio.

ZIP codes: 10
Cities & towns: 10
Area codes: 4
Land area: 462 sq mi

Every ZIP code in Mercer County

453xx–458xx

The complete list of Mercer County, OH ZIP codes with the city each one delivers to.
ZIP code	City
45310	Burkettsville
45822	Celina
45826	Chickasaw
45828	Coldwater
45846	Fort Recovery
45860	Maria Stein
45862	Mendon
45866	Montezuma
45882	Rockford
45883	Saint Henry

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Mercer County codes above are listed without a column we would have to invent.

Cities and towns in Mercer County

A further 2 places in Mercer County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.

Area codes covering Mercer County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where Mercer County's ZIP codes sit

Each point is the reference point of one Mercer County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

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

Scope every ZIP code recorded in Mercer County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.