Mill Creek Washington ZIP Codes

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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Mill Creek. 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 Mill Creek ZIP code begins 980. Those first three digits identify the sectional center facility that processes mail for this part of Washington. Statewide that range covers 71 ZIP codes, so Mill Creek accounts for 1% of it.

Every Washington 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 Mill Creek occupies.

• 206 Area code 206
• 360 Area code 360
• 425 Area code 425
• 564 Area code 564

These codes are associated with Mill Creek through county-level matching, not a per-address guarantee.

Mill Creek Washington area codes in full →

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