As of the census[REF] of 2000, there were 574,335 people, 212,890 households, and 144,126 families residing in the county.
19.6% reported being of Dutch ancestry; 14.9% German, 13.1% English, 7.4% Irish, 7.1% Polish and 5.5% American ancestry according to the 2010 American Community Survey [REF].