Johnston County ZIP Codes

Johnston County is a county of North Carolina.

ZIP codes: 11
Cities & towns: 11
Area codes: 3
Land area: 792 sq mi

Every ZIP code in Johnston County

275xx

The complete list of Johnston County, NC ZIP codes with the city each one delivers to.
ZIP code	City
27504	Benson
27520	Clayton
27524	Four Oaks
27542	Kenly
27555	Micro
27557	Middlesex
27568	Pine Level
27569	Princeton
27576	Selma
27577	Smithfield
27593	Wilsons Mills

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Johnston County

Area codes covering Johnston County

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

Where Johnston County's ZIP codes sit

Each point is the reference point of one Johnston 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 Johnston 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.