The Maryland-National Capital Park and Planning Commission is a quasi-governmental agency covering both Montgomery and Prince George's Counties in Maryland. In Montgomery County, it combines stewardship and maintenance of the Parks, and is the home of the Planning Commission which has significant authority over land-use planning.
Perhaps you would like to see their website?
In the parks, law-enforcement is done by the Park Police:
Emergency Park POLICE: 301-949-3010 Non-emergency Park Police: 301-949-8010