Jones County is a county in the U.S. state of Iowa. As of the 2020 census the population was 20,646. The county seat is Anamosa. The county was founded in 1837 and named after George Wallace Jones, a United States senator and member of Congress.

George Wallace Jones was an American frontiersman, entrepreneur, attorney, and judge, was among the first two United States Senators to represent the state of Iowa after it was admitted to the Union in 1846. A Democrat who was elected before the birth of the Republican Party, Jones served over ten years in the Senate, from December 7, 1848 to March 3, 1859. During the American Civil War, he was arrested by Federal authorities and briefly jailed on suspicion of having pro-Confederate sympathies.