County ZIP codes · Colorado · FIPS 08111
San Juan County, CO ZIP Codes
San Juan County, Colorado has 2 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 1 of the residential ones lie mainly in San Juan County and 1 mainly in a neighboring county; 1 cross the county line.
- ACS2020-24
- Census2020
Where are the ZIP codes of San Juan County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All 2 residential ZIP codes in San Juan County
1 ZIP code lies mainly in San Juan County; 1 more reaches into it from a neighboring county and follows the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 81433 | Silverton | 651 | 3 | $62k | $453k | 100% |
Partly in San Juan County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 81301 | Durango | 29,774 | 39 | $84k | $696k | 22% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
1 ZIP code of San Juan County extends into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In San Juan | Elsewhere |
|---|---|---|
| 81301 | 22% | La Plata County78% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do San Juan County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. San Juan County's ZIP codes use 2 prefixes: 813 and 814.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.