Waterloo Iowa ZIP Codes

Waterloo holds 4 ZIP codes, all inside one county and one postal prefix.

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Waterloo. 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 Waterloo ZIP code begins 507. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 5 ZIP codes, so Waterloo accounts for 80% of it.

Every Iowa 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 Waterloo occupies.

• 319 Area code 319

Waterloo Iowa area codes in full →

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