First three digits · Colorado
ZIP Codes Starting with
44 ZIP codes start with 801, sorted at the Denver, CO (SCF 800) sectional center (USPS labeling list L005, effective October 1, 2026) in Colorado: 35 residential ZIP codes across 6 counties and 9 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 801 mean?
The first digit, 8, is one of ten national areas (Arizona, Colorado, Idaho, New Mexico, Nevada, Utah and Wyoming). The first three, 801, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 801 to the Denver, CO (SCF 800) facility. The last two digits pick the delivery area. By residents, the largest town names among the 801 ZIP codes are Littleton, Parker, Englewood, Castle Rock, Monument and Lone Tree.
The same facility sorts 8 prefixes, 332 ZIP codes in all: 800, 801, 802, 803, 804, 805, 806, 807.
Where are the 801 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 801
| County | ||||||
|---|---|---|---|---|---|---|
| 80101 | Agate | Elbert County | 423 | 1 | $70k | $400k |
| 80102 | Bennett | Adams County | 6,690 | 23 | $113k | $543k |
| 80103 | Byers | Adams County | 3,215 | 9 | $103k | $502k |
| 80104 | Castle Rock | Douglas County | 38,479 | 544 | $134k | $624k |
| 80105 | Deer Trail | Arapahoe County | 2,182 | 6 | $80k | $374k |
| 80106 | Elbert | Elbert County | 4,455 | 26 | $137k | $749k |
| 80107 | Elizabeth | Elbert County | 15,102 | 98 | $135k | $685k |
| 80108 | Castle Rock | Douglas County | 36,730 | 1,041 | $181k | $882k |
| 80109 | Castle Rock | Douglas County | 28,400 | 1,093 | $155k | $676k |
| 80110 | Englewood | Arapahoe County | 23,825 | 3,734 | $86k | $497k |
| 80111 | Englewood | Arapahoe County | 31,561 | 2,897 | $136k | $917k |
| 80112 | Englewood | Arapahoe County | 36,816 | 2,063 | $109k | $659k |
| 80113 | Englewood | Arapahoe County | 22,976 | 2,995 | $97k | $709k |
| 80116 | Franktown | Douglas County | 5,132 | 56 | $146k | $960k |
| 80117 | Kiowa | Elbert County | 2,756 | 15 | $116k | $667k |
| 80118 | Larkspur | Douglas County | 5,632 | 43 | $158k | $887k |
| 80120 | Littleton | Arapahoe County | 29,725 | 3,553 | $94k | $628k |
| 80121 | Littleton | Arapahoe County | 18,029 | 2,500 | $142k | $708k |
| 80122 | Littleton | Arapahoe County | 32,195 | 4,526 | $129k | $634k |
| 80123 | Littleton | Jefferson County | 44,549 | 3,706 | $106k | $620k |
| 80124 | Lone Tree | Douglas County | 22,555 | 2,404 | $130k | $774k |
| 80125 | Littleton | Douglas County | 15,630 | 399 | $180k | $762k |
| 80126 | Littleton | Douglas County | 44,882 | 4,149 | $170k | $782k |
| 80127 | Littleton | Jefferson County | 43,494 | 655 | $137k | $693k |
| 80128 | Littleton | Jefferson County | 36,712 | 2,923 | $121k | $586k |
| 80129 | Littleton | Douglas County | 30,223 | 4,293 | $142k | $664k |
| 80130 | Littleton | Douglas County | 24,719 | 3,595 | $159k | $692k |
| 80131 | Louviers | Douglas County | 276 | 497 | $107k | $428k |
| 80132 | Monument | El Paso County | 30,073 | 754 | $162k | $773k |
| 80133 | Palmer Lake | El Paso County | 2,425 | 818 | $121k | $483k |
| 80134 | Parker | Douglas County | 80,302 | 1,400 | $147k | $678k |
| 80135 | Sedalia | Douglas County | 4,141 | 11 | $136k | $881k |
| 80136 | Strasburg | Adams County | 6,144 | 29 | $112k | $555k |
| 80137 | Watkins | Arapahoe County | 1,689 | 16 | $135k | $669k |
| 80138 | Parker | Douglas County | 36,895 | 595 | $145k | $724k |
| 80150 | Englewood | Arapahoe County | PO Box or unique | – | – | – |
| 80151 | Englewood | Arapahoe County | PO Box or unique | – | – | – |
| 80155 | Englewood | Arapahoe County | PO Box or unique | – | – | – |
| 80160 | Littleton | Arapahoe County | PO Box or unique | – | – | – |
| 80161 | Littleton | Arapahoe County | PO Box or unique | – | – | – |
| 80162 | Littleton | Jefferson County | PO Box or unique | – | – | – |
| 80163 | Littleton | Douglas County | PO Box or unique | – | – | – |
| 80165 | Littleton | Arapahoe County | PO Box or unique | – | – | – |
| 80166 | Littleton | Arapahoe 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.