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County in Iowa, United States

Cedar County is a county located in the U. S. state of Iowa. As of the 2020 census, the population was 18,505. Its county seat is Tipton. The county is named for the Cedar River, which runs through the county. Cedar County is located between the Cedar Rapids, Quad Cities and Iowa City metropolitan areas, areas also known as the "Tri Metro" county. It is the only Iowa county which shares the name of a tree. Cedar County was the focus of the Iowa Cow War of 1931.

Cedar County was formed on December 21, 1837, from sections of Dubuque County. It was named for the Cedar River. In 1840, the City of Tipton, the current county seat, was established. Before the Civil War, the area around West Branch was an active focal point of the Underground Railroad, a network for the freeing of slaves from the southern states. The former US President Herbert Hoover (1874 1964) was born in West Branch in Cedar County. The Cedar County Sheriff's House and Jail is believed to be the last jail and residence combination still in use when it closed in 2001. It was listed on the National Register of Historic Places in 2003.

According to the U. S. Census Bureau, the county has a total area of 582 square miles (1,507 km2), of which 579 square miles (1,500 km2) is land and 2.5 square miles (6 km2) (0.4%) is water. Rock Creek flows through Cedar County.

The 2020 census recorded a population of 18,505 in the county, with a population density of 96.29% of the population reported being of one race. 91.92% were non Hispanic White, 0.45% were Black, 2.50% were Hispanic, 0.28% were Native American, 0.34% were Asian, 0.01% were Native Hawaiian or Pacific Islander and 4.51% were some other race or more than one race. There were 8,190 housing units of which 7,594 were occupied.

As of the census of 2000, there were 18,187 people, 7,147 households, and 5,138 families residing in the county. The population density was There were 7,570 housing units at an average density of The racial makeup of the county was 98.47% White, 0.19% Black or African American, 0.19% Native American, 0.30% Asian, 0.03% Pacific Islander, 0.26% from other races, and 0.57% from two or more races. 0.94% of the population were Hispanic or Latino of any race. There were 7,147 households, out of which 33.30% had children under the age of 18 living with them, 61.60% were married couples living together, 6.70% had a female householder with no husband present, and 28.10% were non families. 23.70% of all households were made up of individuals, and 11.90% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 2.96. In the county, the population was spread out, with 25.30% under the age of 18, 6.90% from 18 to 24, 27.70% from 25 to 44, 23.80% from 45 to 64, and 16.20% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 97.50 males. For every 100 females age 18 and over, there were 94.60 males. The median income for a household in the county was $42,198, and the median income for a family was $48,850. Males had a median income of $32,008 versus $23,260 for females. The per capita income for the county was $19,200. About 4.00% of families and 5.50% of the population were below the poverty line, including 5.00% of those under age 18 and 7.70% of those age 65 or over.