Barrios de Maryland R
- Ramblewood (3)
- Redland (2)
- Reistertown Station (3)
- Remington (10)
- Reservoir Hill (25)
- Richnor Springs (2)
- Ridgely's Delight (5)
- River Hill (1)
- Riverside (50)
- Riviera Beach (2)
- Rockburn Branch Park (2)
- Rockville Town Center (5)
- Rognel Heights (4)
- Rosaryville (5)
- Rosebank (1)
- Rosemont (7)
- Rossmoor (6)
- Rossville (11)
- Ruxton (15)