Trenton is a city located in northeast Butler County, Ohio, United States, west of Middletown. Originally in Madison Township, it later annexed land in Wayne Township, and withdrew to create a paper township. The population was 8,746 at the 2000 census. Trenton apartments for rent comparison page shows most up to date rent information on Trenton apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.