Lafayette is a city in Contra Costa County, California. As of 2011, the city’s population was estimated to be 24,285. Today Lafayette is known for its wealthy inhabitants and undulating rolling hills. The town is also known for excellent schools within the highly ranked Acalanes Union School District. In 2012, the estimated median household income in Lafayette was over $150,000, more than double the statewide average and nearly triple the national average.