Apartments Or Houses For Rent In Monmouth Il . Only 34% of residents rent in monmouth, as most own their homes. Find monmouth apartments for rent that you'll love on redfin. Photos of Southtown Apartments in Monmouth, OR from www.southtownapts.com 1018 n 6th st, monmouth, il 61462. The average apartment rent in this town costs you $794. More to explore in monmouth.