Colorado · Census place 0845970
Longmont, Colorado
Longmont is a city in 2 counties of Colorado with an estimated 99,818 residents on July 1, 2024. It is the 13th largest of 149 incorporated places of 1,000+ people in the state.
- Population 2024
- 99,818
- #13 of 149 in Colorado
- Change since 2020
- +0.6%
- +612 people
- Land area
- 29.3 sq mi
- + 2.03 sq mi water
- Density
- 3,411 / sq mi
- State median 1,848
Measure from here
Tools and pages that start from Longmont
Longmont population, 2020 to 2024
Longmont added 612 residents from July 2020 to July 2024, a change of +0.6%. In the latest year it moved by +713. Among 79 Colorado places of 5,000 or more, that growth ranks 50th; the median place changed by +3.0%. The median place of 5,000+ in Colorado has 14,061 people, so Longmont is 7.1 times that size.
Longmont covers 29.26 square miles of land and 2.03 of water, for 3,411 people per square mile of land. The median Colorado place of 5,000+ has 1,848, so Longmont is denser than the typical town.
The 2 counties Longmont spans
Longmont crosses county lines. The Census county-part estimates split its 99,818 residents as follows; Boulder County holds 98.7% of them. The shaded shapes are on the map above; dots mark the eight nearest places.
- 01Boulder County98,503
- 02Weld County1,315
ZIP codes in Longmont
3 ZIP Code Tabulation Areas (ZCTAs) overlap Longmont by at least 10% of the ZCTA's or the city's land: 80501, 80503, 80504. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.
Where Longmont is
The Census internal point of Longmont is at 40.168200, -105.100500. Denver, the capital, is 30.3 miles SSE in a straight line. The nearest larger place is Boulder, CO (106,803 people), 12.7 miles away.
Internal point
- Decimal
- 40.168200, -105.100500
- DMS
- 40°10'5.52"N 105°06'1.80"W
- UTM
- 13N 491442.4E 4446430.9N
- Geohash
- 9xjk82khs
- Plus code
- 85GP5V9X+7Q
Daylight in Longmont
At 40.17° N, Longmont gets about 15 h 02 min of daylight around the June solstice and 9 h 19 min around the December solstice, a swing of 5 h 43 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.
Places near Longmont
The eight nearest incorporated places of 1,000+ in Colorado, measured between internal points. The closest is Mead, 7.2 miles away, with 6,735 people.
Questions people ask
What is the population of Longmont, CO?
99,818 on July 1, 2024, in the Census Vintage 2024 estimates. That is up 612 (0.6%) from 99,206 in July 2020.
What county is Longmont in?
It spans 2 counties: Boulder County (98,503 residents), Weld County (1,315 residents).
What ZIP codes cover Longmont?
3 ZIP Code Tabulation Areas overlap it by at least 10% of either area: 80501, 80503, 80504.
How far is Longmont from Denver?
30.3 miles (48.7 km) in a straight line, heading SSE from Longmont.
What is the nearest larger city to Longmont?
Boulder, CO, with 106,803 residents, 12.7 miles away between internal points.
Sources and data as of
Data as of: Census Vintage 2024 subcounty estimates (July 1, 2024), 2024 Gazetteer places, 2020 ZCTA to place relationship file.
- 01Census Vintage 2024 subcounty population estimates
- 02Census 2024 Gazetteer, places
- 03Census 2020 ZCTA to place relationship file
- 04Census 2024 cartographic boundary file, counties (1:5,000,000)
How every number is computed: methodology. Spotted a wrong figure? Report an error.