Rock Island County, Illinois

Rock Island County is a located in the  of. As of 2000, the population was 149,374. Its is. It is one of the four counties that make up the --.

Geography
According to the, the county has a total area of 1,168 (451 ). 1,105 km² (427 sq mi) of it is land and 63 km² (24 sq mi) of it (5.41%) is water.

Adjacent Counties

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History
Rock Island County was formed in out of. It was named for Rock Island, an island in the now known as Arsenal Island.

Demographics
As of the of 2000, there were 149,374 people, 60,712 households, and 39,159 families residing in the county. The was 135/km² (350/sq mi). There were 64,489 housing units at an average density of 58/km² (151/sq mi). The racial makeup of the county was 85.52%, 7.54% or , 0.27% , 1.02% , 0.03% , 3.76% from , and 1.86% from two or more races. 8.56% of the population were or  of any race.

There were 60,712 households out of which 28.90% had children under the age of 18 living with them, 49.10% were living together, 11.60% had a female householder with no husband present, and 35.50% were non-families. 30.20% of all households were made up of individuals and 12.50% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 2.97.

In the county the population was spread out with 23.80% under the age of 18, 10.00% from 18 to 24, 27.30% from 25 to 44, 23.80% from 45 to 64, and 15.10% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 94.40 males. For every 100 females age 18 and over, there were 91.40 males.

The median income for a household in the county was $38,608, and the median income for a family was $47,956. Males had a median income of $35,998 versus $24,234 for females. The for the county was $20,164. About 8.10% of families and 10.70% of the population were below the, including 15.70% of those under age 18 and 6.80% of those age 65 or over.

Cities and towns

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