First three digits · Arizona
ZIP Codes Starting with
53 ZIP codes start with 856, sorted at the Tucson, AZ (SCF 856) sectional center (USPS labeling list L005, effective October 1, 2026) in Arizona: 45 residential ZIP codes across 5 counties and 8 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 856 mean?
The first digit, 8, is one of ten national areas (Arizona, Colorado, Idaho, New Mexico, Nevada, Utah and Wyoming). The first three, 856, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 856 to the Tucson, AZ (SCF 856) facility. The last two digits pick the delivery area. By residents, the largest town names among the 856 ZIP codes are Sierra Vista, Marana, Vail, Green Valley, Sahuarita and Rio Rico.
The same facility sorts 2 prefixes, 108 ZIP codes in all: 856, 857.
Where are the 856 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 856
| County | ||||||
|---|---|---|---|---|---|---|
| 85601 | Arivaca | Pima County | 268 | 2 | $31k | $72k |
| 85602 | Benson | Cochise County | 10,019 | 12 | $53k | $203k |
| 85603 | Bisbee | Cochise County | 6,699 | 29 | $48k | $208k |
| 85605 | Bowie | Cochise County | 683 | 2 | $49k | $61k |
| 85606 | Cochise | Cochise County | 1,066 | 6 | $59k | $262k |
| 85607 | Douglas | Cochise County | 17,191 | 22 | $43k | $154k |
| 85608 | Douglas | Cochise County | 2,804 | 1,465 | – | – |
| 85609 | Dragoon | Cochise County | 426 | 4 | $79k | – |
| 85610 | Elfrida | Cochise County | 576 | 1 | $34k | $225k |
| 85611 | Elgin | Santa Cruz County | 1,454 | 4 | $92k | $380k |
| 85613 | Fort Huachuca | Cochise County | 4,983 | 87 | $90k | – |
| 85614 | Green Valley | Pima County | 25,381 | 192 | $65k | $301k |
| 85615 | Hereford | Cochise County | 10,175 | 55 | $74k | $250k |
| 85616 | Huachuca City | Cochise County | 4,941 | 33 | $52k | $175k |
| 85617 | McNeal | Cochise County | 1,094 | 5 | $44k | $123k |
| 85618 | Mammoth | Pinal County | 1,550 | 6 | $52k | $103k |
| 85619 | Mount Lemmon | Pima County | no residents | 0 | – | – |
| 85620 | Naco | Cochise County | 988 | 857 | $58k | $73k |
| 85621 | Nogales | Santa Cruz County | 21,593 | 76 | $44k | $193k |
| 85622 | Green Valley | Pima County | 6,518 | 84 | $77k | $371k |
| 85623 | Oracle | Pinal County | 5,558 | 29 | $69k | $428k |
| 85624 | Patagonia | Santa Cruz County | 1,546 | 5 | $56k | $398k |
| 85625 | Pearce | Cochise County | 1,917 | 6 | $48k | $171k |
| 85626 | Pirtleville | Cochise County | 1,332 | 1,366 | $50k | $94k |
| 85627 | Pomerene | Cochise County | 430 | 39 | $73k | $175k |
| 85628 | Nogales | Santa Cruz County | PO Box or unique | – | – | – |
| 85629 | Sahuarita | Pima County | 31,668 | 134 | $109k | $336k |
| 85630 | Saint David | Cochise County | 1,939 | 13 | $52k | $149k |
| 85631 | San Manuel | Pinal County | 3,508 | 29 | $48k | $120k |
| 85632 | San Simon | Cochise County | 861 | 1 | $53k | $168k |
| 85633 | Sasabe | Pima County | 48 | 0 | $21k | – |
| 85634 | Sells | Pima County | 5,038 | 2 | $36k | $83k |
| 85635 | Sierra Vista | Cochise County | 34,193 | 502 | $62k | $228k |
| 85636 | Sierra Vista | Cochise County | PO Box or unique | – | – | – |
| 85637 | Sonoita | Santa Cruz County | 1,105 | 9 | $100k | $467k |
| 85638 | Tombstone | Cochise County | 1,418 | 5 | $38k | $184k |
| 85639 | Topawa | Pima County | 166 | 1 | $39k | – |
| 85640 | Tumacacori | Santa Cruz County | 207 | 72 | $55k | – |
| 85641 | Vail | Pima County | 34,752 | 101 | $131k | $415k |
| 85643 | Willcox | Graham County | 8,476 | 4 | $58k | $174k |
| 85644 | Willcox | Cochise County | PO Box or unique | – | – | – |
| 85645 | Amado | Pima County | 1,249 | 8 | $61k | $207k |
| 85646 | Tubac | Santa Cruz County | 1,345 | 19 | $73k | $491k |
| 85648 | Rio Rico | Santa Cruz County | 22,118 | 103 | $62k | $225k |
| 85650 | Sierra Vista | Cochise County | 14,876 | 360 | $92k | $327k |
| 85652 | Cortaro | Pima County | PO Box or unique | – | – | – |
| 85653 | Marana | Pima County | 23,574 | 69 | $86k | $334k |
| 85654 | Rillito | Pima County | no residents | 0 | – | – |
| 85655 | Douglas | Cochise County | PO Box or unique | – | – | – |
| 85658 | Marana | Pinal County | 16,051 | 82 | $123k | $478k |
| 85662 | Nogales | Santa Cruz County | PO Box or unique | – | – | – |
| 85670 | Fort Huachuca | Cochise County | PO Box or unique | – | – | – |
| 85671 | Sierra Vista | Cochise County | PO Box or unique | – | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.