The City of Lafayette 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 was founded in 1888 by Mary Miller. She and her husband, Lafayette Miller, had moved to the area to farm land acquired via the Homestead Act in 1871.Lafayette Miller died in 1878, after which Mary Miller moved back to the farm with their six small children. In 1884 coal was discovered on the Miller farm, and in 1887 John Simpson sank the first shaft, thereby starting the coal mining era. In 1888 Mary Miller designated 150 acres (0.61 km2) of the farm for the town of Lafayette, which she named after her late husband.On January 6, 1890,the town of Lafayette was incorporated.