Places
- Madison (Wis.)3
- Maine -- Portland1
- Manahawkin (N.J.)1
- Manhattan (New York, N.Y.)2
- Mansion498
- Mansion Circle 174
- Mansion Interiors1,226
- Mansion exterior1,164
- Maritime Provinces3
- Marshall Hall (Md.)5
- Martha Washington's Garret Chamber8
- Maryland29
- Maryland--Baltimore1
- Maryland--Baltimore County--Catonsville--St. Timothy's Hall1
- Maryland--Harford County1