Harvey County is a county located in the U.S. state of Kansas. Its county seat and most populous city is Newton. As of the 2020 census, the county population was 34,024. The county was named for James Harvey, a U.S. senator and 5th governor of Kansas.

Newton is a city in and the county seat of Harvey County, Kansas, United States. As of the 2020 census, the population of the city was 18,602. Newton is located 25 miles (40 km) north of Wichita. The city of North Newton is located immediately north and exists as a separate political entity. Newton is located at the intersection of Interstate 135, U.S. Route 50, and U.S. Route 81 highways.