as of the census of 2000, there were 31,392 people, 11,209 households, and 8,675 families residing in the city. the population density was 1,486.1 people per square mile (573.9/km²). there were 12,038 housing units at an average density of 569.9 per square mile (220.1/km²). the racial makeup of the city was 89.66% white, 1.73% african american, 0.08% native american, 7.36% asian, 0.02% pacific islander, 0.20% from other races, and 0.95% from two or more races. hispanic or latino of any race were 1.01% of the population.