Warren County, Iowa

Warren County is a located in the  of. As of 2000, the population was 40,671. Its is, and it is one of the five counties that make up the.

Geography
According to the, the county has a total area of 1,485 (573 ). 1,481 km² (572 sq mi) of it is land and 4 km² (2 sq mi) of it (0.27%) is water.

Adjacent counties

 * (north)
 * (east)
 * (southeast)
 * (southwest)
 * (west)

Demographics
As of the of 2000, there were 40,671 people, 14,708 households, and 11,207 families residing in the county. The was 27/km² (71/sq mi). There were 15,289 housing units at an average density of 10/km² (27/sq mi). The racial makeup of the county was 98.08%, 0.27% or , 0.17% , 0.38% , 0.04% , 0.29% from , and 0.76% from two or more races. 1.08% of the population were or  of any race.

There were 14,708 households out of which 37.80% had children under the age of 18 living with them, 64.50% were living together, 8.80% had a female householder with no husband present, and 23.80% were non-families. 19.90% of all households were made up of individuals and 8.70% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 3.05.

In the county the population was spread out with 27.00% under the age of 18, 9.70% from 18 to 24, 28.20% from 25 to 44, 23.20% from 45 to 64, and 11.80% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 94.60 males. For every 100 females age 18 and over, there were 91.80 males.

The median income for a household in the county was $50,349, and the median income for a family was $56,344. Males had a median income of $36,983 versus $26,768 for females. The for the county was $20,558. About 3.70% of families and 5.10% of the population were below the, including 6.40% of those under age 18 and 5.20% of those age 65 or over.