Longmont is a Home Rule Municipality in Boulder and Weld counties of the U.S. state of Colorado. Longmont is located northeast of the county seat of Boulder and 33 miles (53 km) north-northwest of the Colorado State Capitol in Denver.
Longmont is located in northeastern Boulder County at 40°10′18″N 105°06′33″W / 40.171583°N 105.109085°W / 40.171583; -105.109085. The city extends eastward into western Weld County. U.S. Highway 287 (Main Street) runs through the center of the city, leading north 16 miles (26 km) to Loveland and south 34 miles (55 km) to downtown Denver. State Highway 119 passes through the city south of downtown and leads southwest 15 miles (24 km) to Boulder and east 5 miles (8 km) to Interstate 25.
The elevation at City Hall is 4,978 feet (1,517 m) above sea level. St. Vrain Creek, a tributary of the South Platte River, flows through the city just south of the city center.
According to the U.S. Census Bureau, Longmont has a total area of 27.6 square miles (71.6 km), of which 26.2 square miles (67.8 km) is land and 1.5 square miles (3.8 km), or 5.30%, is water.
As of the census of 2010, there were 86,270 people residing in the city (2014 estimate: 90,237). The population density was 3,294 people per square mile. There were 35,008 housing units. The racial makeup of the city was:
There were 33,551 households out of which 36.9% had children under the age of 18 living with them, 54.6% were married couples living together, 10.1% had a female householder with no husband present, and 30.8% were non-families. 23.7% of all households were made up of individuals and 7.3% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.15.
In the city, the population was spread out with 28.6% under the age of 20, 6.3% from 20 to 24, 27.6% from 25 to 44, 26.2% from 45 to 64, and 11.1% who were 65 years of age or older. The median age was 36 years.
The median income for a household in the city was $58,698, and the median income for a family was $70,864. Males had a median income of $51,993 versus $41,025 for females. The per capita income for the city was $29,209. About 11.1% of families and 14.7% of the population were below the poverty line, including 21.4% of those under age 18 and 8.2% of those age 65 or over.
In 2011 Longmont was rated the 2nd safest city in Colorado.