First three digits · Arizona
ZIP Codes Starting with
31 ZIP codes start with 851, sorted at the Phoenix, AZ (SCF 852) sectional center (USPS labeling list L005, effective October 1, 2026) in Arizona: 25 residential ZIP codes across 3 counties and 6 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 851 mean?
The first digit, 8, is one of ten national areas (Arizona, Colorado, Idaho, New Mexico, Nevada, Utah and Wyoming). The first three, 851, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 851 to the Phoenix, AZ (SCF 852) facility. The last two digits pick the delivery area. By residents, the largest town names among the 851 ZIP codes are San Tan Valley, Queen Creek, Maricopa, Casa Grande, Apache Junction and Florence.
The same facility sorts 8 prefixes, 372 ZIP codes in all: 850, 851, 852, 853, 855, 859, 860, 863.
Where are the 851 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 851
| County | ||||||
|---|---|---|---|---|---|---|
| 85117 | Apache Junction | Pinal County | PO Box or unique | – | – | – |
| 85118 | Gold Canyon | Pinal County | 14,932 | 100 | $86k | $482k |
| 85119 | Apache Junction | Pinal County | 25,420 | 556 | $72k | $265k |
| 85120 | Apache Junction | Pinal County | 31,191 | 1,351 | $58k | $162k |
| 85121 | Bapchule | Pinal County | 2,800 | 37 | $31k | – |
| 85122 | Casa Grande | Pinal County | 61,624 | 1,093 | $68k | $284k |
| 85123 | Arizona City | Pinal County | 10,003 | 297 | $69k | $250k |
| 85127 | Chandler Heights | Maricopa County | PO Box or unique | – | – | – |
| 85128 | Coolidge | Pinal County | 19,487 | 117 | $66k | $249k |
| 85130 | Casa Grande | Pinal County | PO Box or unique | – | – | – |
| 85131 | Eloy | Pinal County | 18,794 | 61 | $57k | $259k |
| 85132 | Florence | Pinal County | 38,671 | 64 | $79k | $339k |
| 85135 | Hayden | Gila County | 331 | 229 | $30k | – |
| 85137 | Kearny | Pinal County | 2,406 | 10 | $58k | $134k |
| 85138 | Maricopa | Pinal County | 55,260 | 652 | $96k | $379k |
| 85139 | Maricopa | Pinal County | 20,784 | 41 | $87k | $344k |
| 85140 | San Tan Valley | Pinal County | 51,260 | 622 | $102k | $445k |
| 85141 | Picacho | Pinal County | 364 | 6 | $71k | – |
| 85142 | Queen Creek | Pinal County | 93,700 | 925 | $129k | $594k |
| 85143 | San Tan Valley | Pinal County | 44,444 | 1,421 | $94k | $389k |
| 85144 | San Tan Valley | Pinal County | PO Box or unique | – | – | – |
| 85145 | Red Rock | Pinal County | 3,277 | 85 | $80k | $290k |
| 85147 | Sacaton | Pinal County | 4,911 | 69 | $49k | $328k |
| 85172 | Stanfield | Pinal County | 1,688 | 23 | $72k | $160k |
| 85173 | Superior | Pinal County | 2,600 | 55 | $46k | $147k |
| 85178 | Apache Junction | Pinal County | PO Box or unique | – | – | – |
| 85190 | Tortilla Flat | Maricopa County | PO Box or unique | – | – | – |
| 85191 | Valley Farms | Pinal County | 32 | 60 | – | – |
| 85192 | Winkelman | Pinal County | 1,849 | 6 | $60k | $162k |
| 85193 | Casa Grande | Pinal County | 4,118 | 19 | $58k | $167k |
| 85194 | Casa Grande | Pinal County | 8,077 | 100 | $83k | $350k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.