Get to Know Harmony Hall

Harmony Hall is an 18th century mansion is located on a 62.5-acre open pasture land estate along the Potomac River in Prince George’s County, Maryland. This estate was purchased by the National Park Service in 1966, in hopes of preserving the decades of southern Maryland cultural heritage represented here.

The mansion is not open to the public, however the grounds can be walked. Parking is located at the Harmony Hall Regional Center located adjacent to the park.

The history is only a click away.

Last updated: May 10, 2020

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Contact Info

Mailing Address:

13551 Fort Washington Road
Fort Washington, MD 20744


(771) 208-1555
If the staff is unable to answer the phone, please leave a message and we will get back to you as soon as possible. Thank you. The phone is not monitored when the Visitor Center is closed, Monday through Wednesday. You may call Oxon Hill Farm at 771-208-1536 Monday through Wednesday for assistance..

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