| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Aladdin Village | city | Maryland | United States | 39.17 | -76.78 | 200 | |
| Aladdin Village Trailer Park | city | Maryland | United States | 39.17 | -76.78 | 200 | |
| Albantown | city | Maryland | United States | 39.64 | -76.81 | 830 | |
| Albatross Mobile Home Park | city | Maryland | United States | 38.35 | -75.16 | 6 | |
| Alberta Heights | city | Maryland | United States | 39.15 | -76.67 | 98 | |
| Alberton (historical) | city | Maryland | United States | 39.32 | -76.81 | 383 | |
| Albeth Heights | city | Maryland | United States | 39.30 | -76.90 | 830 | |
| Aldino | city | Maryland | United States | 39.56 | -76.20 | 354 | |
| Alesia | city | Maryland | United States | 39.68 | -76.83 | 866 | |
| Alesia Heights | city | Maryland | United States | 39.68 | -76.82 | 866 | |
| Algonquin | city | Maryland | United States | 38.58 | -76.11 | 3 | |
| Allana Acres | city | Maryland | United States | 39.71 | -76.91 | 1046 | |
| Allandale | city | Maryland | United States | 39.63 | -77.06 | 830 | |
| Allanwood | city | Maryland | United States | 39.11 | -77.04 | 347 | |
| Allegany Grove | city | Maryland | United States | 39.64 | -78.83 | 1102 | |
| Allen | city | Maryland | United States | 38.29 | -75.69 | 19 | |
| Allendale Estates | city | Maryland | United States | 39.58 | -76.25 | 262 | |
| Allenford | city | Maryland | United States | 39.31 | -76.86 | 830 | |
| Allens Fresh | city | Maryland | United States | 38.41 | -76.94 | 32 | |
| Allenville | city | Maryland | United States | 39.06 | -76.52 | 49 | |
| Allibone (historical) | city | Maryland | United States | 39.62 | -76.31 | 242 | |
| Allnut Farms Estates | city | Maryland | United States | 39.20 | -76.97 | 830 | |
| Alloway | city | Maryland | United States | 39.14 | -76.48 | 19 | |
| Allview Estates | city | Maryland | United States | 39.19 | -76.86 | 298 | |
| Allwood | city | Maryland | United States | 39.18 | -76.65 | 91 | |
| Allyson Gardens | city | Maryland | United States | 39.43 | -76.79 | 830 | |
| Alma Meadows | city | Maryland | United States | 39.59 | -76.86 | 830 | |
| Almar Estates | city | Maryland | United States | 38.81 | -76.60 | 104 | |
| Almond Valley | city | Maryland | United States | 39.45 | -76.93 | 830 | |
| Alpha | city | Maryland | United States | 39.32 | -76.93 | 830 | |
| Alpine | city | Maryland | United States | 39.41 | -77.32 | 830 | |
| Alpine View | city | Maryland | United States | 39.53 | -77.57 | 935 | |
| Alta Vista | city | Maryland | United States | 39.01 | -77.11 | 324 | |
| Alta Vista Terrace | city | Maryland | United States | 39.01 | -77.12 | 337 | |
| Altamont | city | Maryland | United States | 39.43 | -79.28 | 2762 | |
| Altamont Place | city | Maryland | United States | 39.60 | -75.93 | 65 | |
| Alto Vista | city | Maryland | United States | 39.55 | -76.99 | 830 | |
| Altogether | city | Maryland | United States | 39.62 | -77.42 | 830 | |
| Alton Homes | city | Maryland | United States | 39.52 | -76.18 | 101 | |
| Altoona Beach | city | Maryland | United States | 39.16 | -76.54 | 3 |