| City Name | County | Zip Code |
| Gaithersburg | Montgomery | ***** |
| Galena | Kent | ***** |
| Galesville | Anne Arundel | 20765 |
| Gambrills | Anne Arundel | 21054 |
| Gapland | Washington | 21736 |
| Garfield | Frederick | 21783 |
| Garrett Park | Montgomery | 20896 |
| Garretts Mill | Washington | 21758 |
| Garrison | Baltimore | 21055 |
| Georgetown | Kent | 21930 |
| Germantown | Montgomery | ***** |
| Gibson Island | Anne Arundel | 21056 |
| Gilmore | Allegany | 21532 |
| Girdletree | Worcester | 21829 |
| Glen Arm | Baltimore | 21057 |
| Glen Burnie | Anne Arundel | ***** |
| Glen Echo | Montgomery | 20812 |
| Glenarden | Prince George's | 20706 |
| Glencoe | Baltimore | 21152 |
| Glenelg | Howard | 21737 |
| Glenmont | Montgomery | 20906 |
| Glenn Dale | Prince George's | 20769 |
| Glenwood | Howard | 21738 |
| Glyndon | Baltimore | 21071 |
| Goldsboro | Caroline | 21636 |
| Gortner | Garrett | 21550 |
| Graceham | Frederick | 21788 |
| Granite | Baltimore | 21163 |
| Gantsville | Garrett | 21536 |
| Garsonville | Queen Anne's | 21638 |
| Great Mills | Saint Mary's | 20634 |
| Green Haven | Anne Arundel | 21122 |
| Greenbelt | Prince George's | ***** |
| Greensboro | Caroline | 21639 |
| Gunpowder | Harford | 21010 |
| Gwynn Oak | Baltimore | ***** |
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