 Regarding ancestry, in 2000 14.4% of the population were ethnically German, 9.0% Irish, 8.5% English, 8.5% Polish, 5.7% Italian and 5.5% American, 87.4% spoke only English at home; 2.0% spoke Spanish, 1.3% Syriac (Neo Aramaic) and 1.0% Arabic.The population density as of the 2000 census was 1,369 people per square mile (528/km²).There were 492,006 housing units at an average density of 564 per square mile (218/km²).