| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sea Isle Mobile Home Park | city | Maryland | United States | 38.34 | -75.11 | 3 | |
| Seaborne Estates | city | Maryland | United States | 39.12 | -76.52 | 49 | |
| Seabreeze | city | Maryland | United States | 38.57 | -76.26 | 3 | |
| Seabright | city | Maryland | United States | 38.38 | -75.14 | 3 | |
| Seabrook | city | Maryland | United States | 38.97 | -76.84 | 147 | |
| Seabrook Acres | city | Maryland | United States | 38.98 | -76.84 | 150 | |
| Seashore Beach | city | Maryland | United States | 38.33 | -76.41 | 0 | |
| Seat Pleasant | city | Maryland | United States | 38.90 | -76.91 | 131 | |
| Seaview | city | Maryland | United States | 38.57 | -76.26 | 3 | |
| Seawilde | city | Maryland | United States | 38.53 | -76.20 | 3 | |
| Sebring | city | Maryland | United States | 39.20 | -76.87 | 367 | |
| Secretary | city | Maryland | United States | 38.61 | -75.95 | 16 | |
| Security | city | Maryland | United States | 39.65 | -77.69 | 830 | |
| Selassie Villa | city | Maryland | United States | 38.83 | -76.51 | 3 | |
| Selby Beach | city | Maryland | United States | 38.91 | -76.52 | 3 | |
| Selby Grove | city | Maryland | United States | 39.11 | -76.57 | 49 | |
| Selby-on-the-Bay | city | Maryland | United States | 38.92 | -76.52 | 22 | |
| Selbys Landing | city | Maryland | United States | 38.75 | -76.70 | 42 | |
| Selbysport | city | Maryland | United States | 39.69 | -79.38 | 1712 | |
| Sellman | city | Maryland | United States | 39.21 | -77.38 | 830 | |
| Sellman Estates | city | Maryland | United States | 39.04 | -76.93 | 141 | |
| Seminary Overlook | city | Maryland | United States | 39.43 | -76.65 | 308 | |
| Seminary Springs | city | Maryland | United States | 39.42 | -76.66 | 347 | |
| Seneca | city | Maryland | United States | 39.08 | -77.34 | 200 | |
| Seneca Chase | city | Maryland | United States | 39.14 | -77.40 | 347 | |
| Seneca Highlands | city | Maryland | United States | 39.11 | -77.29 | 396 | |
| Seneca Overlook | city | Maryland | United States | 39.26 | -77.15 | 830 | |
| Seneca Park | city | Maryland | United States | 39.32 | -76.37 | 3 | |
| Seneca Park | city | Maryland | United States | 39.17 | -77.23 | 400 | |
| Seneca Springs | city | Maryland | United States | 39.27 | -77.19 | 830 | |
| Seneca Upland | city | Maryland | United States | 39.25 | -77.16 | 830 | |
| Sequoia | city | Maryland | United States | 39.10 | -76.98 | 410 | |
| Serenity Woods | city | Maryland | United States | 38.50 | -76.84 | 147 | |
| Settlers Landing | city | Maryland | United States | 39.11 | -76.85 | 193 | |
| Seven Cedars | city | Maryland | United States | 39.61 | -76.40 | 380 | |
| Seven Havens | city | Maryland | United States | 39.66 | -76.82 | 830 | |
| Seven Oaks | city | Maryland | United States | 39.01 | -77.02 | 249 | |
| Seven Oaks | city | Maryland | United States | 39.11 | -76.71 | 127 | |
| Severn | city | Maryland | United States | 39.14 | -76.70 | 141 | |
| Severn Crossroads | city | Maryland | United States | 39.06 | -76.63 | 98 | |
| Severn Forest | city | Maryland | United States | 39.01 | -76.52 | 39 | |
| Severn Forest | city | Maryland | United States | 39.10 | -76.68 | 144 | |
| Severn Grove | city | Maryland | United States | 39.01 | -76.53 | 68 | |
| Severn Heights | city | Maryland | United States | 39.05 | -76.53 | 98 | |
| Severn Landing | city | Maryland | United States | 39.04 | -76.59 | 62 | |
| Severn Lea | city | Maryland | United States | 39.11 | -76.70 | 98 | |
| Severn Mills | city | Maryland | United States | 39.13 | -76.71 | 164 | |
| Severn Mobile Home Park | city | Maryland | United States | 39.13 | -76.69 | 108 | |
| Severn Ridge | city | Maryland | United States | 39.14 | -76.72 | 154 | |
| Severn Village | city | Maryland | United States | 39.13 | -76.70 | 141 | |
| Severn Woods | city | Maryland | United States | 39.14 | -76.70 | 154 | |
| Severna Forest | city | Maryland | United States | 39.08 | -76.56 | 49 | |
| Severna Gardens | city | Maryland | United States | 39.08 | -76.56 | 22 | |
| Severna Park | city | Maryland | United States | 39.07 | -76.55 | 55 | |
| Severndale | city | Maryland | United States | 39.08 | -76.57 | 45 | |
| Severnside | city | Maryland | United States | 39.00 | -76.49 | 36 | |
| Severnsides | city | Maryland | United States | 39.13 | -76.69 | 150 | |
| Severnview | city | Maryland | United States | 39.04 | -76.52 | 88 | |
| Seward | city | Maryland | United States | 38.45 | -76.08 | 9 | |
| Sewell Mills | city | Maryland | United States | 39.00 | -75.78 | 39 | |
| Sewells Orchard | city | Maryland | United States | 39.20 | -76.83 | 351 |