As of the census of 2000, there were 13,991 people, 5,937 households, and 3,775 families residing in the city. The population density was 2,085.3 people per square mile (805.1/km²). There were 6,407 housing units at an average density of 954.9/sq mi (368.7/km²). The racial makeup of the city was 90.45% White, 2.22% Asian, 0.66% African American, 0.70% Native American, 0.16% Pacific Islander, 3.15% from other races, and 2.65% from two or more races. Hispanic or Latino of any race were 6.94% of the population.
There were 5,937 households out of which 30.4% had children under the age of 18 living with them, 51.5% were married couples living together, 8.3% had a female householder with no husband present, and 36.4% were non-families. 28.3% of all households were made up of individuals and 9.7% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.89. Median home cost was $200,972 in 2000 and had grown to $316,400 by 2006.
In the city the population was spread out with 24.6% under the age of 18, 9.4% from 18 to 24, 31.4% from 25 to 44, 20.2% from 45 to 64, and 14.4% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 94.5 males. For every 100 females age 18 and over, there were 91.7 males.
The median income for a household in the city was $52,515, and the median income for a family was $65,172. Males had a median income of $43,480 versus $28,395 for females. The per capita income for the city was $29,786. About 3.0% of families and 5.6% of the population were below the poverty line, including 3.7% of those under age 18 and 8.2% of those age 65 or over.
Interstate 5 runs north-south through the middle of the city and crosses the Willamette River on the Boone Bridge. Wilsonville has two interchanges with the freeway north of the river, at Wilsonville Road on the south and where Boones Ferry Road meets Elligsen Road on the north end of town. To the south of the river, the Charbonneau interchange crosses I-5 at the southern limit of the city. Boeckman Road is the only other street that crosses I-5 and links the western and eastern parts of Wilsonville. Wilsonville, Boones Ferry (northern portion is OR 141), Boeckman, and Stafford roads are the main arterials in the city.
Transit service was formerly provided by TriMet, but the city decided to "opt-out" and now operates South Metro Area Regional Transit (SMART). SMART has connections with Salem's transit service, Canby's transit service, and TriMet. The Westside Express Service (WES), a commuter rail line to Beaverton, began operations in February 2009. Wilsonville Station is the southern terminus of the nearly 15-mile (24 km) line operated by TriMet, and the station is the hub for SMART services.