According to the United States Census Bureau, the city has a total area of 12.3 square miles (31.8 km²), of which, 12.2 square miles (31.7 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.16%) is water.
As of the census of 2000, there were 13,004 people, 4,881 households, and 2,948 families residing in the city. The population density was 1,061.4 people per square mile (409.9/km²). There were 5,419 housing units at an average density of 442.3/sq mi (170.8/km²). The racial makeup of the city was 77.23% White, 4.03% Black or African American, 3.93% Native American, 6.34% Asian, 0.26% Pacific Islander, 2.78% from other races, and 5.42% from two or more races. 8.25% of the population were Hispanic or Latino of any race.
There were 4,881 households out of which 33.9% had children under the age of 18 living with them, 36.4% were married couples living together, 18.9% had a female householder with no husband present, and 39.6% were non-families. 33.2% of all households were made up of individuals and 14.5% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.19.
In the city the population was spread out with 30.1% under the age of 18, 10.3% from 18 to 24, 25.8% from 25 to 44, 19.2% from 45 to 64, and 14.7% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 95.8 males. For every 100 females age 18 and over, there were 90.7 males.
The median income for a household in the city was $21,911, and the median income for a family was $27,666. Males had a median income of $28,587 versus $21,916 for females. The per capita income for the city was $12,345. About 16.2% of families and 23.1% of the population were below the poverty line, including 39.3% of those under age 18 and 8.9% of those age 65 or over.