Pasco is one of three cities that make up the Tri-Cities region of the state of Washington. The Tri-Cities is a mid-sized metropolitan area of approximately 230,000 people that also includes the cities of Kennewick and Richland.
The population was 32,066 at the 2000 census. Since that time the city has experienced rapid growth, and the official April 1, 2008 estimate from the Washington State Office of Financial Management puts the city's population at 52,290.
As of the census of 2000, there were 32,066 people, 9,619 households, and 7,262 families residing in the city. The population density was 1,141.9 people per square mile (440.9/km²). There were 10,341 housing units at an average density of 368.2/sq mi (142.2/km²). The racial makeup of the city was 52.76% White, 3.22% African American, 0.77% Native American, 1.77% Asian, 0.14% Pacific Islander, 37.44% from other races, and 3.9% from two or more races. Hispanic or Latino of any race was 56.26% of the population.
There were 9,619 households out of which 45.6% had children under the age of 18 living with them, 54.7% were married couples living together, 14.3% had a female householder with no husband present, and 24.5% were non-families. 20.1% of all households were made up of individuals and 8.5% had someone living alone who was 65 years of age or older. The average household size was 3.30 and the average family size was 3.79.
In the city the population was spread out with 35.5% under the age of 18, 11.8% from 18 to 24, 28.5% from 25 to 44, 15.5% from 45 to 64, and 8.7% who were 65 years of age or older. The median age was 27 years. For every 100 females, there were 106.7 males. For every 100 females age 18 and over, there were 104.2 males.
The median income for a household in the city was $34,540, and the median income for a family was $37,342. Males had a median income of $29,016 versus $22,186 for females. The per capita income for the city was $13,404. About 19.5% of families and 23.3% of the population were below the poverty line, including 31.4% of those under age 18 and 9.6% of those age 65 or over.