Looking for three-bedroom apartments in O'Fallon, MO? With 89 options available, you’ll find spacious layouts designed to accommodate a variety of lifestyles. Three-bedroom apartments are perfect for renters who needs extra space for a home office, guest room, or storage. When you browse O'Fallon three-bedroom apartments on ForRent.com, you can find a variety of comfortable and functional living options that suit your needs. Start your search and find your next home today.