Casa Grande Arizona ZIP Codes

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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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

Scope every ZIP code recorded for Casa Grande. 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 Casa Grande ZIP code begins 851. Those first three digits identify the sectional center facility that processes mail for this part of Arizona. Statewide that range covers 31 ZIP codes, so Casa Grande accounts for 13% of it.

Every Arizona 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 Casa Grande occupies.

• 520 Area code 520

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

Casa Grande Arizona area codes in full →

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