3,930.4/km² (10,178.7/mi²). There are 47,863 housing units at an average density of 2,237.3/km² (5,794.0/mi²). The racial makeup of the city is 78.29% White , 7.25% Asian , 3.78% African American , 0.47% Native American , 0.10% Pacific Islander , 5.97% from other races , and 4.13% from two or more races.