First three digits · Colorado
ZIP Codes Starting with
42 ZIP codes start with 805, sorted at the Denver, CO (SCF 800) sectional center (USPS labeling list L005, effective October 1, 2026) in Colorado: 32 residential ZIP codes across 3 counties and 10 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 805 mean?
The first digit, 8, is one of ten national areas (Arizona, Colorado, Idaho, New Mexico, Nevada, Utah and Wyoming). The first three, 805, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 805 to the Denver, CO (SCF 800) facility. The last two digits pick the delivery area. By residents, the largest town names among the 805 ZIP codes are Fort Collins, Longmont, Loveland, Windsor, Erie and Johnstown.
The same facility sorts 8 prefixes, 332 ZIP codes in all: 800, 801, 802, 803, 804, 805, 806, 807.
Where are the 805 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 805
| County | ||||||
|---|---|---|---|---|---|---|
| 80501 | Longmont | Boulder County | 44,147 | 3,500 | $81k | $489k |
| 80502 | Longmont | Boulder County | PO Box or unique | – | – | – |
| 80503 | Longmont | Boulder County | 35,846 | 391 | $114k | $756k |
| 80504 | Longmont | Weld County | 63,451 | 671 | $114k | $592k |
| 80510 | Allenspark | Boulder County | 663 | 10 | $101k | $771k |
| 80511 | Estes Park | Larimer County | PO Box or unique | – | – | – |
| 80512 | Bellvue | Larimer County | 1,903 | 4 | $98k | $625k |
| 80513 | Berthoud | Larimer County | 18,271 | 256 | $127k | $601k |
| 80514 | Dacono | Weld County | 6,721 | 729 | $105k | $489k |
| 80515 | Drake | Larimer County | 934 | 19 | $67k | $545k |
| 80516 | Erie | Weld County | 39,048 | 965 | $169k | $727k |
| 80517 | Estes Park | Larimer County | 9,657 | 32 | $95k | $702k |
| 80520 | Firestone | Weld County | 1,140 | 1,935 | $64k | $449k |
| 80521 | Fort Collins | Larimer County | 38,776 | 2,766 | $58k | $565k |
| 80522 | Fort Collins | Larimer County | PO Box or unique | – | – | – |
| 80523 | Fort Collins | Larimer County | PO Box or unique | – | – | – |
| 80524 | Fort Collins | Larimer County | 40,030 | 326 | $85k | $561k |
| 80525 | Fort Collins | Larimer County | 54,211 | 2,321 | $92k | $588k |
| 80526 | Fort Collins | Larimer County | 44,326 | 1,386 | $89k | $552k |
| 80527 | Fort Collins | Larimer County | PO Box or unique | – | – | – |
| 80528 | Fort Collins | Larimer County | 24,960 | 1,352 | $130k | $705k |
| 80530 | Frederick | Weld County | 6,242 | 2,003 | $124k | $466k |
| 80532 | Glen Haven | Larimer County | 185 | 5 | $53k | $312k |
| 80533 | Hygiene | Boulder County | PO Box or unique | – | – | – |
| 80534 | Johnstown | Weld County | 20,502 | 427 | $129k | $553k |
| 80535 | Laporte | Larimer County | 1,896 | 33 | $111k | $483k |
| 80536 | Livermore | Larimer County | 2,383 | 6 | $118k | $631k |
| 80537 | Loveland | Larimer County | 44,425 | 363 | $86k | $484k |
| 80538 | Loveland | Larimer County | 50,110 | 490 | $87k | $498k |
| 80539 | Loveland | Larimer County | PO Box or unique | – | – | – |
| 80540 | Lyons | Boulder County | 4,642 | 30 | $140k | $796k |
| 80541 | Masonville | Larimer County | PO Box or unique | – | – | – |
| 80542 | Mead | Weld County | 5,155 | 560 | $134k | $615k |
| 80543 | Milliken | Weld County | 9,774 | 316 | $105k | $416k |
| 80544 | Niwot | Boulder County | no residents | 0 | – | – |
| 80545 | Red Feather Lakes | Larimer County | 937 | 3 | $93k | $395k |
| 80546 | Severance | Weld County | 271 | 2,420 | $113k | – |
| 80547 | Timnath | Larimer County | 8,821 | 1,566 | $181k | $742k |
| 80549 | Wellington | Larimer County | 14,325 | 77 | $108k | $476k |
| 80550 | Windsor | Weld County | 46,456 | 886 | $126k | $582k |
| 80551 | Windsor | Weld County | PO Box or unique | – | – | – |
| 80553 | Fort Collins | Larimer 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.