North Newton is a city in Harvey County, Kansas, United States. As of the 2020 census, the population of the city was 1,814. It is located betwe…North Newton is a city in Harvey County, Kansas, United States. As of the 2020 census, the population of the city was 1,814. It is located between the north side of the city of Newton and the south side of Interstate I-135. North Newton is home of Bethel College.