Chico is the most populous city in Butte County, California, United States. The population was 59,954 at the time of the 2000 census but was estimated to have grown to 87,713 as of 2009. The city is a cultural, economic, and educational center of the northern Sacramento Valley and home to both Chico State University and Bidwell Park, one of the country's 25 largest municipal parks and the 13th largest municipally-owned park.Other cities in close proximity to the Chico Metropolitan Area (population 212,000) include Paradise and Oroville, while local towns and villages (unincorporated areas) include Durham, Cohasset, Dayton, Hamilton City, Nord, and Forest Ranch. The Chico Metropolitan Area is the 14th largest metropolitan statistical area in California.The official city nickname is "City of Roses," according to the Seal of the City of Chico, California. Chico has been designated as a Tree City USA for 26 years by the Arbor Day Foundation.