Longmont Colorado ZIP Codes
Longmont holds 4 ZIP codes, spread across 2 counties.
Every ZIP code in Longmont
| ZIP code | County |
|---|---|
| 80501 | Boulder County |
| 80502 | Boulder County |
| 80503 | Boulder County |
| 80504 | Weld County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Longmont codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Longmont. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Longmont ZIP code begins 805. Those first three digits identify the sectional center facility that processes mail for this part of Colorado. Statewide that range covers 42 ZIP codes, so Longmont accounts for 10% of it.
Every Colorado ZIP prefix and the region it covers →
Area codes covering Longmont
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Longmont occupies.
Longmont Colorado area codes in full →
Where Longmont's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Longmont
| City | Distance | ZIP codes |
|---|---|---|
| Mead Colorado ZIP codes | 7.2 mi | 1 ZIP code |
| Frederick Colorado ZIP codes | 7.9 mi | 1 ZIP code |
| Firestone Colorado ZIP codes | 8.1 mi | 1 ZIP code |
| Erie Colorado ZIP codes | 9.4 mi | 1 ZIP code |
| Lyons Colorado ZIP codes | 9.6 mi | 1 ZIP code |
| Berthoud Colorado ZIP codes | 11 mi | 1 ZIP code |
| Dacono Colorado ZIP codes | 11 mi | 1 ZIP code |
| Lafayette Colorado ZIP codes | 12 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.