Areas penwin roofing & windows serve
- Baltimore
- Marlton
- Upper Marlboro
- Marlboro Village
- Friendly
- Oxon Hill
- Morningside
- Forestville
- Dunkirk
- Largo
- Bowie
- Crofton
- Baden
- Beltsville
- Mitchellville
- Accokeek
- Lothian
- Galesville
- Gambrills
- Crownsville
- Brandywine
- Queensland
- Croom
- Danville
- Temple Hills
- Rosaryville
- Westphalia
- Brock Hall
- District Heights
- Annapolis
- Parole
- Kettering
- College Park
- Fort Washington
- Waldorf
- Friendship
- Fort Meade
- Odenton
- Woodmore
- Hyattsville