The City of Lafayette (/ˌlɑːfiːˈɛt, ˌlæf-/) is a Home Rule Municipality located in Boulder County, Colorado, United States. The city population was 24,453 at the 2010 United States Census.
Lafayette is located in southeastern Boulder County at 39°59′42″N 105°6′2″W / 39.99500°N 105.10056°W / 39.99500; -105.10056 (39.995, -105.100556). It is bordered by the town of Erie to the north and east, by the city of Broomfield to the east and south, and by Louisville to the southwest. U.S. Highway 287 is the main road through the city, leading north to Longmont and south to Broomfield and Denver. State Highway 7 leads east from Lafayette to Brighton and west to Boulder. There is also an exit off Interstate 25 to the city.
According to the United States Census Bureau, Lafayette has a total area of 9.3 square miles (24 km), of which 9.3 square miles (24 km) is land and 0.15 square miles (0.4 km), or 1.50%, is water.
As of the census of 2010, there were 24,453 people, 9,632 households, and 6,354 families residing in the city. The population density was 2,584 people per square mile (997.8/km²). There were 9,997 housing units at an average density of 1,052.3 per square mile (408.0/km²). The racial makeup of the city was 85.6% White, 1.1% African American, 0.9% Native American, 3.8% Asian, 0.05% Pacific Islander, 5.4% some other race, and 3.2% from two or more races. Hispanic or Latino of any race were 18.2% of the population.
There were 9,632 households, of which 36.5% had children under the age of 18 living in them; 49.9% were headed by married couples living together; 11.6% had a female householder with no husband present; and 34.0% were non-families. Of all households, 25.5% were made up of individuals, and 5.9% were someone living alone who was 65 years of age or older. Average household size was 2.54, and average family size was 3.08.
In the city, the population was spread out with 25.4% under the age of 18, 6.9% from 18 to 24, 29.7% from 25 to 44, 29.9% from 45 to 64, and 8.1% who were 65 years of age or older. The median age was 37.6 years. For every 100 females, there were 95.8 males. For every 100 females age 18 and over, there were 91.9 males.
For the period 2009-2011, the estimated median income for a household in the city in 2010 was $66,202, and the median income for a family was $79,212. Male full-time workers had a median income of $54,313 versus $50,166 for females. The per capita income for the city was $34,711. About 9.3% of families and 12.5% of the population were below the poverty line.