As of the census of 2000, there were 66,430 people, 23,483 households, and 17,025 families residing in the city. The population density was 2,034.4 people per square mile (785.6/km²). There were 26,203 housing units at an average density of 802.4/sq mi (309.9/km²). The racial makeup of the city was 67.87% White, 13.38% African American, 0.51% Native American, 0.98% Asian, 0.08% Pacific Islander, 14.42% from other races, and 2.77% from two or more races. Hispanic or Latino of any race were 35% of the population.
There were 23,483 households out of which 39.2% had children under the age of 18 living with them, 52.9% were married couples living together, 14.2% had a female householder with no husband present, and 27.5% were non-families. 23.0% of all households were made up of individuals and 8.0% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.32.
In the city the population was spread out with 30.0% under the age of 18, 11.2% from 18 to 24, 29.4% from 25 to 44, 19.5% from 45 to 64, and 10.0% who were 65 years of age or older. The median age was 31 years. For every 100 females there were 94.4 males. For every 100 females age 18 and over, there were 91.4 males.
The median income for a household in the city was $40,559, and the median income for a family was $45,346. Males had a median income of $38,039 versus $25,012 for females. The per capita income for the city was $17,641. About 13.0% of families and 15.5% of the population were below the poverty line, including 21.9% of those under age 18 and 9.8% of those age 65 or over.
Greyhound Bus Lines operates the Baytown Station at Baytown Travel Express.
Baytown Airport is a privately-owned general aviation airport in unincorporated Harris County located north of Baytown. RWJ Airpark is a privately-owned airport three miles east of Baytown in Beach City. The closest airports with commercial airline service are William P. Hobby Airport and George Bush Intercontinental Airport in Houston.
Baytown is served by Metropolitan Transit Authority of Harris County, Texas (METRO) express route 236 Maxey Road/Baytown during the rush hours, sending commuters to downtown Houston
Baytown is linked to Interstate 10 (see map) by State Highway 146 (Lanier Freeway) and Spur 330 (Decker Drive). It is also linked by the Fred Hartman Bridge, which crosses into the city from nearby La Porte; the bridge was built in 1995, replacing the Baytown Tunnel, to allow a deeper ship channel.