Alexander County ZIP Codes

Alexander County is a county of Illinois.

ZIP codes: 7
Cities & towns: 7
Area codes: 2
Land area: 235 sq mi

Every ZIP code in Alexander County

629xx

The complete list of Alexander County, IL ZIP codes with the city each one delivers to.
ZIP code	City
62914	Cairo
62957	Mc Clure
62962	Miller City
62969	Olive Branch
62988	Tamms
62990	Thebes
62993	Unity

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Cities and towns in Alexander County

A further 4 places in Alexander 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 Alexander County

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

Where Alexander County's ZIP codes sit

Each point is the reference point of one Alexander 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 Alexander 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.