Irmo South Carolina ZIP Codes

Irmo holds a single ZIP code.

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Irmo. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

Every Irmo ZIP code begins 290. Those first three digits identify the sectional center facility that processes mail for this part of South Carolina. Statewide that range covers 53 ZIP codes, so Irmo accounts for 2% of it.

Every South Carolina ZIP prefix and the region it covers →

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Irmo occupies.

• 803 Area code 803
• 839 Area code 839

Irmo South Carolina area codes in full →

Straight-line distance between place reference points, not driving distance.