Rosaryville State Park

Mount Airy Mansion in Rosaryville State Park



Prince George's County

Rosaryville State Park
7805 West Marlton Avenue
Upper Marlboro, MD 20772​
Contact: 301-888-1410​

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.

Calendar of Events​​​


Rosaryville is a 982 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.​ The park is also the location of the historic Mount Airy Mansion. Parties, great and small, weddings, births and visits from seven presidents have left their mark, lending a wonderful feeling of expectancy to this lovely old home. 

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