Cedar County is a county located in the U.S. state of Iowa. It is named for the Cedar River, which runs through the county, the county is at the crossroads between the Cedar Rapids, Quad Cities and Iowa City metropolitan areas also known as the "Tri-Metro" county, it is also the only Iowa county which shares the name of a tree. The population was 18,499 in the 2010 census, an increase from 18,187 in 2000. Its county seat is Tipton. The first American president born west of the Mississippi River, Herbert Hoover, was born in Cedar County in the town of West Branch.
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 American 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.