Coffeyville is a city in southeastern Montgomery County, Kansas, United States, located along the Verdigris River in the state's southeastern region. As of the 2020 census, the population of the city was 8,826. Coffeyville is the most populous city of Montgomery County, and the home to Coffeyville Community College. The town of South Coffeyville, Oklahoma is approximately 1 mile (1.6 km) south of the city.