| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Idlewild | city | Maryland | United States | 38.76 | -76.06 | 16 | |
| Idlewild | city | Maryland | United States | 38.99 | -76.73 | 98 | |
| Idlewilde | city | Maryland | United States | 38.85 | -76.50 | 3 | |
| Idlewood | city | Maryland | United States | 39.37 | -76.59 | 354 | |
| Idlewood Acres | city | Maryland | United States | 38.31 | -76.89 | 3 | |
| Idlewood Park | city | Maryland | United States | 38.63 | -76.88 | 200 | |
| Idlewood Trailer Park | city | Maryland | United States | 38.63 | -76.88 | 200 | |
| Idlewylde | city | Maryland | United States | 39.38 | -76.59 | 351 | |
| Iglehart | city | Maryland | United States | 39.01 | -76.57 | 98 | |
| Ijamsville | city | Maryland | United States | 39.36 | -77.32 | 410 | |
| Ijamsville Heights | city | Maryland | United States | 39.35 | -77.32 | 830 | |
| Ilchester | city | Maryland | United States | 39.25 | -76.76 | 190 | |
| Imperial Gardens | city | Maryland | United States | 39.38 | -76.78 | 830 | |
| Independence Village | city | Maryland | United States | 38.50 | -76.80 | 147 | |
| Indian Acres | city | Maryland | United States | 39.39 | -75.91 | 49 | |
| Indian Creek Estates | city | Maryland | United States | 38.51 | -76.71 | 98 | |
| Indian Creek Estates | city | Maryland | United States | 39.06 | -76.61 | 65 | |
| Indian Falls | city | Maryland | United States | 39.62 | -75.93 | 88 | |
| Indian Hammock | city | Maryland | United States | 38.00 | -75.77 | 3 | |
| Indian Harbor | city | Maryland | United States | 38.75 | -76.28 | 0 | |
| Indian Head | city | Maryland | United States | 38.60 | -77.16 | 3 | |
| Indian Head Manor | city | Maryland | United States | 38.63 | -77.06 | 147 | |
| Indian Hill | city | Maryland | United States | 39.33 | -76.95 | 830 | |
| Indian Hills | city | Maryland | United States | 39.68 | -76.51 | 830 | |
| Indian Hills | city | Maryland | United States | 39.02 | -76.49 | 65 | |
| Indian Landing Estates | city | Maryland | United States | 39.07 | -76.62 | 82 | |
| Indian Meadows | city | Maryland | United States | 39.70 | -76.58 | 830 | |
| Indian Princess | city | Maryland | United States | 39.48 | -76.38 | 298 | |
| Indian Queen Estates | city | Maryland | United States | 38.76 | -77.02 | 49 | |
| Indian River Estates | city | Maryland | United States | 38.49 | -76.70 | 98 | |
| Indian Spring Terrace | city | Maryland | United States | 39.01 | -77.01 | 298 | |
| Indian Spring Village | city | Maryland | United States | 39.02 | -77.00 | 252 | |
| Indian Springs | city | Maryland | United States | 39.65 | -78.00 | 830 | |
| Indian Springs | city | Maryland | United States | 39.46 | -77.45 | 413 | |
| Indian Town | city | Maryland | United States | 39.12 | -76.09 | 19 | |
| Indian Village | city | Maryland | United States | 39.10 | -76.53 | 19 | |
| Indianbone | city | Maryland | United States | 38.49 | -76.01 | 3 | |
| Indiantown | city | Maryland | United States | 38.19 | -75.41 | 19 | |
| Indiantown | city | Maryland | United States | 38.37 | -76.83 | 16 | |
| Ingleside | city | Maryland | United States | 39.09 | -75.88 | 49 | |
| Ingleton | city | Maryland | United States | 38.78 | -76.16 | 3 | |
| Inverness | city | Maryland | United States | 39.26 | -76.49 | 3 | |
| Inverness Knolls | city | Maryland | United States | 39.04 | -77.16 | 252 | |
| Inwood | city | Maryland | United States | 39.30 | -77.02 | 830 | |
| Ireland Estates | city | Maryland | United States | 38.67 | -76.58 | 98 | |
| Irelands Corner | city | Maryland | United States | 39.33 | -75.88 | 49 | |
| Iron Hill | city | Maryland | United States | 39.65 | -75.79 | 190 | |
| Irongate | city | Maryland | United States | 39.43 | -76.97 | 830 | |
| Irongate | city | Maryland | United States | 39.45 | -77.49 | 1053 | |
| Ironshire | city | Maryland | United States | 38.28 | -75.23 | 19 | |
| Ironsides | city | Maryland | United States | 38.49 | -77.16 | 98 | |
| Irvington | city | Maryland | United States | 39.28 | -76.69 | 170 | |
| Island Acres | city | Maryland | United States | 38.67 | -76.14 | 3 | |
| Island Creek | city | Maryland | United States | 38.45 | -76.56 | 78 | |
| Island View | city | Maryland | United States | 38.93 | -76.30 | 3 | |
| Island View Beach | city | Maryland | United States | 39.27 | -76.40 | 0 | |
| Islands of Balmoral | city | Maryland | United States | 39.42 | -77.29 | 351 | |
| Iverness | city | Maryland | United States | 38.14 | -75.81 | 3 | |
| Ivory | city | Maryland | United States | 39.28 | -76.98 | 830 | |
| Ivory Mill | city | Maryland | United States | 39.67 | -76.54 | 830 | |
| Ivy Hill | city | Maryland | United States | 39.48 | -76.67 | 318 | |
| Ivy Hill | city | Maryland | United States | 39.49 | -76.31 | 295 | |
| Ivy Hill | city | Maryland | United States | 39.29 | -76.80 | 406 | |
| Ivy Hill Way | city | Maryland | United States | 39.42 | -77.05 | 830 | |
| Ivy Meadows | city | Maryland | United States | 39.44 | -76.87 | 830 | |
| Ivytown | city | Maryland | United States | 38.72 | -76.04 | 49 |