Longmont city, Colorado
Official LSAD Designation: Longmont city • Census GEOID: 0845970
• Boulder County / Weld County
Longmont city is an incorporated city in Boulder County, Weld County, Colorado. According to official records from the Census (2025), Longmont city had an estimated population of 100,109 residents. Official Census Bureau geographic records classify this community under LSAD designation Longmont city (GEOID 0845970).
Local Government Administration U.S. Census Bureau GMAF
City Of Longmont
Municipal
Official Title:
Assistant City Manager
Address:
350 KIMBARK ST, LONGMONT CO 80501-5551
County Of Boulder
County
Official Title:
Chairman
Address:
PO BOX 471, BOULDER CO 80306-0471
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 100,109 | 2025 |
| Median Household Income | $90,671 | 2020-2024 |
| Median Home Value | $572,800 | 2020-2024 |
| Land Area | 29.28 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).