Ottawa County /

Ottawa County is a county in the U.S. state of Michigan. As of the 2010 census, the population was 263,801. The county seat is Grand Haven. According to the 2000 census, the county has a total area of 1,631.97 square miles (4,226.8 km), of which 565.65 square miles (1,465.0 km) (or 34.66%) is land and 1,066.32 square miles (2,761.8 km) (or 65.34%) is water. As of the census of 2000, there were 238,314 people, 81,662 households, and 61,328 families residing in the county. The population density was 421 people per square mile (163/km²). There were 86,856 housing units at an average density of 154 per square mile (59/km²). The racial makeup of the county was 91.52% White, 1.05% Black or African American, 0.36% Native American, 2.09% Asian, 0.02% Pacific Islander, 3.48% from other races, and 1.48% from two or more races. 7.00% of the population were Hispanic or Latino of any race. 37.3% were of Dutch, 14.6% German, 6.2% English, 5.6% Irish and 5.4% American ancestry according to Census 2000. 91.5% spoke English and 5.4% Spanish as their first language. There were 81,662 households out of which 39.30% had children under the age of 18 living with them, 64.60% were married couples living