| City Name | County | Zip Code |
| Nanjemoy | Charles | 20662 |
| Nanticoke | Wicomico | 21840 |
| National | Allegany | 21532 |
| Neavitt | Talbot | 21652 |
| New Carrollton | Prince George's | 20784 |
| New London | Frederick | 21774 |
| New Market | Frederick | 21774 |
| New Midway | Frederick | 21775 |
| New Windsor | Carroll | 21776 |
| Newark | Worcester | 21841 |
| Newburg | Charles | 20664 |
| Newcomb | Talbot | 21653 |
| Newhope | Wicomico | 21874 |
| Nikep | Allegany | 21546 |
| Norbeck | Montgomery | 20906 |
| Norrisville | Harford | 21161 |
| North Beach | Calvert | 20714 |
| North Bethesda | Montgomery | 20852 |
| North East | Cecil | 21901 |
| Nottingham | Baltimore | 21236 |
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