As of the census of 2000, there were 105,080 people, 31,411 households, and 25,254 families residing in the city. The population density was 2,518.4/km² (6,524.6/mi²). There were 32,058 housing units at an average density of 768.3/km² (1,990.5/mi²). The racial makeup of the city was 23.0% White, 6.0% African American, 0.3% Native American, 32.0% Asian, 0.6% Pacific Islander, .2% from other races, and 2.2% from two or more races. Hispanic or Latino mainly of any race were 35.7% of the population.
There were 31,411 households out of which 41.9% had children under the age of 18 living with them, 58.2% were married couples living together, 15.8% had a female householder with no husband present, and 19.6% were non-families. 14.8% of all households were made up of individuals and 6.0% had someone living alone who was 65 years of age or older. The average household size was 3.32 and the average family size was 3.67.
In the city the population was spread out with 28.5% under the age of 18, 10.0% from 18 to 24, 30.5% from 25 to 44, 20.6% from 45 to 64, and 10.4% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 94.4 males. For every 100 females age 18 and over, there were 90.2 males.
The median income for a household in the city was $53,002, and the median income for a family was $57,614. Males had a median income of $38,160 versus $31,138 for females. The per capita income for the city was $19,342. About 6.8% of families and 9.0% of the population were below the poverty line, including 11.1% of those under age 18 and 7.3% of those age 65 or over.
Over the past two decades, West Covina has experienced significant demographic change. The Hispanic proportion of its population has increased from 21% in 1980 to 35.7% in 2000, while the white non-Hispanic proportion has decreased from 64.8% to 23% in that period. The proportion of the population that is Asian or Pacific Islander increased from 3.8% to 32.6% from 1980 to 2000. At the same time, the population of the city as a whole has grown: