Rosaryville State Park
Prince George’s · Maryland Department of Natural Resources
A place to get outside.
Rosaryville State Park7805 West Marlton Avenue Upper Marlboro, MD 20772Contact: Park Headquarters 301-888-1410Duty Ranger is 443-975-4358 Hours: Park is Open 8 a.m. to sunset. All vehicles must exit the park before the gate closes at sunset. If locked in, call Park Watch at 1- 800 825 7275. Rosaryville is a 1227 acre day-use park with miles of trails for hiking, biking and equestrians. To gain access to Rosaryville State Park, make a right turn into the entrance just south of Osborne Road while traveling south on U.S. 301.
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Locations represent park land, not necessarily an entrance. Follow official entrance directions. Map tiles © OpenStreetMap contributors.
This map represents park land. Use the official park map and entrance directions for your journey.
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Park facts and notices are checked separately. Missing facility information does not mean a facility is absent. Official visitor page checked Oct 15, 2026.
- Maryland state park directory · Oct 15, 2026
- Maryland DNR lands · Oct 15, 2026