As of the 2000 U.S. Census, the city's population was 141,674, but as of 2007, it is estimated to be at 152,968. It claims largest all volunteer municipal fire department in the United States, the Pasadena Volunteer Fire Department. The city's economy is closely linked to the nearby Houston Ship Channel and its related industrial districts, as well as the National Aeronautics and Space Administration's Lyndon B. Johnson Space Center in the bordering Clear Lake area.
As of the census of 2000, there were 141,674 people, 47,031 households, and 35,179 families residing in the city. The population density was 3,208.1 people per square mile (1,238.7/km²). There were 50,367 housing units at an average density of 1,140.5/sq mi (440.4/km²). The racial makeup of the city was 71.45% White, 1.63% African American, 0.68% Native American, 1.83% Asian, 0.04% Pacific Islander, 21.30% from other races, and 3.08% from two or more races. Hispanic or Latino of any race were 48.24% of the population.
There were 47,031 households out of which 43.1% had children under the age of 18 living with them, 55.8% were married couples living together, 13.1% had a female householder with no husband present, and 25.2% were non-families. 20.4% of all households were made up of individuals and 6.2% had someone living alone who was 65 years of age or older. The average household size was 2.99 and the average family size was 3.48.
In the city the population was spread out with 31.6% under the age of 18, 11.4% from 18 to 24, 31.2% from 25 to 44, 17.9% from 45 to 64, and 7.9% who were 65 years of age or older. The median age was 29 years. For every 100 females there were 99.8 males. For every 100 females age 18 and over, there were 97.6 males.
The median income for a household in the city was $38,522, and the median income for a family was $42,541. Males had a median income of $34,330 versus $25,869 for females. The per capita income for the city was $16,301. About 13.2% of families and 16.0% of the population were below the poverty line, including 20.8% of those under age 18 and 10.5% of those age 65 or over.
Pasadena is served by three freeway systems. Interstate 45 is the closest interstate to the Pasadena city limits. The main freeway artery is the Pasadena Freeway (State Highway 225). The east side of the Sam Houston Tollway (Beltway 8) runs through the eastern portion of the city.
METRO operates a park & ride service from the Pasadena Town Square Mall. This joint venture between Harris County, the city of Pasadena and METRO extended select trips. METRO operates four trips during the morning and five trips during the afternoon rush hours.