Johnson County ZIP Codes

Johnson County is a county of Iowa.

ZIP codes: 14
Cities & towns: 9
Area codes: 1
Land area: 613 sq mi

Every ZIP code in Johnson County

522xx–527xx

The complete list of Johnson County, IA ZIP codes with the city each one delivers to.
ZIP code	City
52235	Hills
52240	Iowa City
52241	Coralville
52242	Iowa City
52243	Iowa City
52244	Iowa City
52245	Iowa City
52246	Iowa City
52317	North Liberty
52322	Oxford
52333	Solon
52338	Swisher
52340	Tiffin
52755	Lone Tree

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Johnson County

Area codes covering Johnson County

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

319 Area code 319

Where Johnson County's ZIP codes sit

Each point is the reference point of one Johnson 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 Johnson 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.