| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Reba L Anthony Estates | city | Maryland | United States | 39.21 | -76.05 | 3 | |
| Rebas Retreat | city | Maryland | United States | 39.53 | -76.96 | 830 | |
| Rebecca Ridge | city | Maryland | United States | 39.54 | -76.96 | 830 | |
| Reckford | city | Maryland | United States | 39.48 | -76.43 | 830 | |
| Recovery | city | Maryland | United States | 39.05 | -76.14 | 3 | |
| Red Fox Meadow | city | Maryland | United States | 39.42 | -77.03 | 830 | |
| Red Hill | city | Maryland | United States | 39.47 | -77.70 | 830 | |
| Red Hill | city | Maryland | United States | 39.64 | -78.86 | 1669 | |
| Red Hill | city | Maryland | United States | 38.34 | -76.53 | 49 | |
| Red Hill Acres | city | Maryland | United States | 39.72 | -76.20 | 324 | |
| Red Hill Estates | city | Maryland | United States | 39.71 | -76.19 | 324 | |
| Red Lion Inn Estates | city | Maryland | United States | 39.34 | -77.01 | 830 | |
| Red Oak Hills | city | Maryland | United States | 39.47 | -76.90 | 830 | |
| Red Oak Hills West | city | Maryland | United States | 39.47 | -76.91 | 830 | |
| Red Point | city | Maryland | United States | 39.52 | -75.98 | 49 | |
| Redbridge | city | Maryland | United States | 39.13 | -76.70 | 141 | |
| Redgate | city | Maryland | United States | 38.26 | -76.60 | 98 | |
| Redgate | city | Maryland | United States | 38.44 | -76.80 | 147 | |
| Redhill | city | Maryland | United States | 38.57 | -77.13 | 147 | |
| Redhill Estates | city | Maryland | United States | 38.57 | -77.13 | 147 | |
| Redhouse | city | Maryland | United States | 39.31 | -79.45 | 2588 | |
| Redland | city | Maryland | United States | 39.15 | -77.14 | 406 | |
| Reece Heights | city | Maryland | United States | 39.12 | -76.71 | 141 | |
| Reeds Village | city | Maryland | United States | 39.65 | -76.90 | 944 | |
| Reeds at Bayview Mobile Home Park | city | Maryland | United States | 39.44 | -76.28 | 3 | |
| Reels Mill | city | Maryland | United States | 39.36 | -77.37 | 390 | |
| Reese | city | Maryland | United States | 39.54 | -76.94 | 830 | |
| Reese Manor | city | Maryland | United States | 39.53 | -76.93 | 830 | |
| Reeses Corner | city | Maryland | United States | 39.17 | -76.20 | 3 | |
| Regal Estastes | city | Maryland | United States | 38.74 | -76.67 | 52 | |
| Regency Estates | city | Maryland | United States | 39.05 | -77.17 | 331 | |
| Regency Manor Mobile Home Park | city | Maryland | United States | 38.74 | -76.65 | 144 | |
| Regwood | city | Maryland | United States | 39.47 | -76.45 | 400 | |
| Rehobeth | city | Maryland | United States | 38.04 | -75.66 | 3 | |
| Reichs Ford Estates | city | Maryland | United States | 39.38 | -77.36 | 830 | |
| Reid | city | Maryland | United States | 39.71 | -77.68 | 830 | |
| Reids Grove | city | Maryland | United States | 38.53 | -75.83 | 19 | |
| Reisterstown | city | Maryland | United States | 39.47 | -76.83 | 830 | |
| Relay | city | Maryland | United States | 39.23 | -76.70 | 49 | |
| Relda Square | city | Maryland | United States | 39.14 | -77.25 | 406 | |
| Reliance | city | Maryland | United States | 38.64 | -75.71 | 42 | |
| Remington Farms | city | Maryland | United States | 39.18 | -76.17 | 6 | |
| Remsberg Acres | city | Maryland | United States | 39.43 | -77.54 | 830 | |
| Remsburg Heights | city | Maryland | United States | 39.45 | -77.31 | 830 | |
| Renix (historical) | city | Maryland | United States | 39.56 | -78.86 | 830 | |
| Renn Branch Estates | city | Maryland | United States | 39.37 | -77.48 | 400 | |
| Reo Vista Plaza | city | Maryland | United States | 38.82 | -76.69 | 49 | |
| Reservoir Ridge | city | Maryland | United States | 39.40 | -76.87 | 830 | |
| Resh Mill Farms | city | Maryland | United States | 39.66 | -76.80 | 830 | |
| Resourceful Acres | city | Maryland | United States | 39.43 | -77.21 | 830 | |
| Rest Haven | city | Maryland | United States | 38.78 | -76.54 | 0 | |
| Retreat Farms | city | Maryland | United States | 39.56 | -76.66 | 380 | |
| Retreat Grove (historical) | city | Maryland | United States | 39.47 | -77.38 | 298 | |
| Revell | city | Maryland | United States | 39.04 | -76.52 | 88 | |
| Revell Downs | city | Maryland | United States | 39.03 | -76.44 | 3 | |
| Revere Park | city | Maryland | United States | 39.40 | -76.52 | 347 | |
| Rewastico | city | Maryland | United States | 38.41 | -75.76 | 13 | |
| Reynolds | city | Maryland | United States | 39.51 | -79.03 | 1896 |