As of the census of 2000, there were 34,854 people, 13,911 households, and 8,916 families residing in the city. The population density was 1,631.6 people per square mile (630.0/km). There were 14,670 housing units at an average density of 686.7 per square mile (265.2/km). The population has been gradually increasing over the last decade. During the workday, the city swells to more than 120,000 residents, workers, and visitors, due to the more than 3,600 businesses that are located in the city.