Williamston Michigan ZIP Codes

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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Williamston. 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 Williamston ZIP code begins 488. Those first three digits identify the sectional center facility that processes mail for this part of Michigan. Statewide that range covers 88 ZIP codes, so Williamston accounts for 1% of it.

Every Michigan 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 code below serves the same ground Williamston occupies.

• 517 Area code 517

Williamston Michigan area codes in full →

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