Eureka Missouri ZIP Codes

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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Eureka. 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 Eureka ZIP code begins 630. Those first three digits identify the sectional center facility that processes mail for this part of Missouri. Statewide that range covers 65 ZIP codes, so Eureka accounts for 2% of it.

Every Missouri 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 Eureka occupies.

• 314 Area code 314
• 557 Area code 557
• 636 Area code 636

Eureka Missouri area codes in full →

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