| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Araby View | city | Maryland | United States | 39.35 | -77.39 | 830 | |
| Arbor Greene | city | Maryland | United States | 38.69 | -76.63 | 101 | |
| Arboranda Estates | city | Maryland | United States | 39.68 | -77.79 | 830 | |
| Arbordale | city | Maryland | United States | 39.15 | -76.62 | 49 | |
| Arborview | city | Maryland | United States | 38.50 | -76.78 | 147 | |
| Arborwood | city | Maryland | United States | 39.46 | -76.79 | 830 | |
| Arbour Green | city | Maryland | United States | 39.40 | -76.46 | 150 | |
| Arbour Manor | city | Maryland | United States | 39.24 | -76.70 | 52 | |
| Arbutus | city | Maryland | United States | 39.25 | -76.70 | 98 | |
| Arcadia | city | Maryland | United States | 39.10 | -76.43 | 0 | |
| Arcadia Shores | city | Maryland | United States | 38.76 | -76.16 | 3 | |
| Arch Bridge | city | Maryland | United States | 39.45 | -77.50 | 948 | |
| Arched Bow Valley | city | Maryland | United States | 39.62 | -76.83 | 830 | |
| Arcola | city | Maryland | United States | 39.05 | -77.05 | 403 | |
| Arden Valley | city | Maryland | United States | 39.57 | -76.69 | 830 | |
| Arden on the Severn | city | Maryland | United States | 39.07 | -76.58 | 3 | |
| Arden-on-the-Severn | city | Maryland | United States | 39.07 | -76.58 | 3 | |
| Ardmore | city | Maryland | United States | 38.93 | -76.85 | 196 | |
| Ardwick | city | Maryland | United States | 38.95 | -76.88 | 75 | |
| Ardwick Park | city | Maryland | United States | 38.94 | -76.87 | 98 | |
| Argonne Hills | city | Maryland | United States | 39.11 | -76.77 | 200 | |
| Arlington | city | Maryland | United States | 39.34 | -76.68 | 830 | |
| Armacost | city | Maryland | United States | 39.61 | -76.80 | 830 | |
| Armagh | city | Maryland | United States | 39.38 | -76.62 | 830 | |
| Armiger | city | Maryland | United States | 39.13 | -76.53 | 72 | |
| Armistead Gardens | city | Maryland | United States | 39.30 | -76.55 | 49 | |
| Armistead Homes | city | Maryland | United States | 39.31 | -76.56 | 98 | |
| Arnold | city | Maryland | United States | 39.03 | -76.50 | 98 | |
| Arnold Heights | city | Maryland | United States | 38.85 | -76.94 | 278 | |
| Arnoldtown | city | Maryland | United States | 39.41 | -77.61 | 830 | |
| Arrington Estates | city | Maryland | United States | 39.39 | -76.93 | 830 | |
| Arrowhead | city | Maryland | United States | 39.19 | -76.86 | 298 | |
| Arrowhead | city | Maryland | United States | 39.46 | -77.41 | 344 | |
| Arrowhead Acres | city | Maryland | United States | 39.60 | -76.07 | 347 | |
| Arrowhead Farms Estates | city | Maryland | United States | 38.98 | -76.69 | 134 | |
| Arters Mill | city | Maryland | United States | 39.67 | -77.07 | 830 | |
| Arters Mill Estates | city | Maryland | United States | 39.69 | -77.07 | 830 | |
| Arthur Ridge | city | Maryland | United States | 39.42 | -77.03 | 830 | |
| Arundel | city | Maryland | United States | 39.57 | -75.87 | 39 | |
| Arundel Acres | city | Maryland | United States | 39.08 | -76.68 | 154 | |
| Arundel Beach | city | Maryland | United States | 39.08 | -76.52 | 3 | |
| Arundel Gardens | city | Maryland | United States | 39.21 | -76.62 | 134 | |
| Arundel Hills | city | Maryland | United States | 39.20 | -76.64 | 127 | |
| Arundel Mobile Village | city | Maryland | United States | 39.08 | -76.71 | 196 | |
| Arundel View | city | Maryland | United States | 39.07 | -76.68 | 157 | |
| Arundel Village | city | Maryland | United States | 39.22 | -76.60 | 111 | |
| Arundel on the Bay | city | Maryland | United States | 38.92 | -76.46 | 3 |