Defiance County ZIP Codes

Defiance County is a county of Ohio.

ZIP codes: 8
Cities & towns: 8
Area codes: 2
Land area: 411 sq mi

Every ZIP code in Defiance County

435xx

The complete list of Defiance County, OH ZIP codes with the city each one delivers to.
ZIP code	City
43512	Defiance
43519	Evansport
43520	Farmer
43526	Hicksville
43530	Jewell
43536	Mark Center
43549	Ney
43556	Sherwood

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Defiance County

A further 4 places in Defiance 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 Defiance County

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

Where Defiance County's ZIP codes sit

Each point is the reference point of one Defiance 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 Defiance 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.