620.1/km² (1,605.9/mi²). There were 3,347 housing units at an average density of 248.0/km² (642.3/mi²). The racial makeup of the city was 89.70% White , 6.08% Asian , 0.82% African American , 0.13% Native American , 0.07% Pacific Islander , 1.02% from other races , and 2.17% from two or more races,