Feature Name | Class | Elev.
meters | County | Latitude
DMS | Longitude
DMS |
| Neavitt Post Office | Post Office | 2 | Talbot | 38 43 40 N | 076 17 18 W |
| New Market Post Office | Post Office | 165 | Frederick | 39 22 59 N | 077 16 16 W |
| New Midway Post Office | Post Office | 143 | Frederick | 39 33 55 N | 077 17 41 W |
| New Windsor Post Office | Post Office | 153 | Carroll | 39 32 30 N | 077 06 23 W |
| Newark Post Office | Post Office | 9 | Worcester | 38 15 01 N | 075 17 30 W |
| Newburg Post Office | Post Office | 38 | Charles | 38 22 41 N | 076 57 15 W |
| Newcomb Post Office | Post Office | 3 | Talbot | 38 45 10 N | 076 10 41 W |
| Nikep Post Office | Post Office | 425 | Allegany | 39 32 59 N | 079 00 01 W |
| North Beach Post Office | Post Office | 0 | Calvert | 38 42 15 N | 076 31 59 W |
| North East Post Office | Post Office | 5 | Cecil | 39 35 46 N | 075 56 29 W |
| North Ocean City Station Ocean City Post Office | Post Office | 1 | Worcester | 38 23 13 N | 075 03 60 W |
| Northwood Station Baltimore Post Office | Post Office | 96 | Baltimore (city) | 39 22 02 N | 076 34 54 W |
| Nottingham Branch Baltimore Post Office | Post Office | | Baltimore | 39 22 40 N | 076 27 20 W |
| Oakland Mills Post Office | Post Office | 125 | Howard | 39 12 36 N | 076 50 43 W |
| Oakland Post Office | Post Office | 726 | Garrett | 39 24 36 N | 079 24 25 W |
| Oakville Post Office (historical) | Post Office | 43 | St. Mary's | 38 23 28 N | 076 38 36 W |
| Ocean City Post Office | Post Office | 2 | Worcester | 38 20 10 N | 075 05 06 W |
| Odenton Post Office | Post Office | 51 | Anne Arundel | 39 04 57 N | 076 41 29 W |
| Oldtown Post Office | Post Office | 171 | Allegany | 39 32 28 N | 078 36 41 W |
| Olney Post Office | Post Office | 153 | Montgomery | 39 09 18 N | 077 04 18 W |
| Oraville Post Office (historical) | Post Office | 49 | St. Mary's | 38 25 04 N | 076 41 42 W |
| Oriole Post Office | Post Office | 1 | Somerset | 38 10 27 N | 075 48 49 W |
| Owings Mills Post Office | Post Office | 139 | Baltimore | 39 24 44 N | 076 46 44 W |
| Owings Post Office | Post Office | 27 | Calvert | 38 42 57 N | 076 35 59 W |
| Oxford Post Office | Post Office | 2 | Talbot | 38 41 17 N | 076 10 22 W |
| Oxon Hill Post Office | Post Office | 57 | Prince George's | 38 48 10 N | 076 59 25 W |
| Park Hall Post Office | Post Office | 31 | St. Mary's | 38 13 10 N | 076 25 52 W |
| Parkton Post Office | Post Office | 124 | Baltimore | 39 38 31 N | 076 39 30 W |
| Parkville Branch Baltimore Post Office | Post Office | | Baltimore | 39 22 43 N | 076 32 19 W |
| Parsonsburg Post Office | Post Office | 24 | Wicomico | 38 23 23 N | 075 28 13 W |
| Pasadena Post Office | Post Office | | Anne Arundel | 39 07 13 N | 076 30 45 W |
| Patapsco Post Office | Post Office | 159 | Carroll | 39 32 18 N | 076 53 39 W |
| Patterson Station Baltimore Post Office | Post Office | 10 | Baltimore (city) | 39 17 16 N | 076 35 36 W |
| Pearson Post Office (historical) | Post Office | 32 | St. Mary's | 38 16 05 N | 076 27 31 W |
| Peninsula Junction Post Office (historical) | Post Office | 3 | Somerset | 38 09 40 N | 075 41 14 W |
| Perry Hall Post Office | Post Office | | Baltimore | 39 23 35 N | 076 29 17 W |
| Perry Point Post Office | Post Office | 24 | Cecil | 39 33 12 N | 076 04 14 W |
| Perryman Post Office | Post Office | 13 | Harford | 39 27 59 N | 076 12 09 W |
| Perryville Post Office | Post Office | 21 | Cecil | 39 33 34 N | 076 04 20 W |
| Phoenix Post Office | Post Office | 183 | Baltimore | 39 31 08 N | 076 33 35 W |
| Pike Station Post Office | Post Office | 116 | Montgomery | 39 03 32 N | 077 07 24 W |
| Pikesville Post Office | Post Office | 157 | Baltimore | 39 22 45 N | 076 43 19 W |
| Piney Point Post Office | Post Office | 2 | St. Mary's | 38 08 23 N | 076 30 14 W |
| Pisgah Post Office | Post Office | 39 | Charles | 38 32 26 N | 077 08 06 W |
| Pittsville Post Office | Post Office | 15 | Wicomico | 38 23 41 N | 075 24 44 W |
| Plumpoint Post Office (historical) | Post Office | 1 | Calvert | 38 36 50 N | 076 30 44 W |
| Pocomoke City Post Office | Post Office | 3 | Worcester | 38 04 29 N | 075 34 02 W |
| Point of Rocks Post Office | Post Office | 76 | Frederick | 39 16 31 N | 077 31 44 W |
| Pomfret Post Office | Post Office | 60 | Charles | 38 35 07 N | 077 01 29 W |
| Poolesville Post Office | Post Office | 125 | Montgomery | 39 08 42 N | 077 24 52 W |
| Port Deposit Post Office | Post Office | 12 | Cecil | 39 36 15 N | 076 06 54 W |
| Port Herman Post Office (historical) | Post Office | 4 | Cecil | 39 30 07 N | 075 54 06 W |
| Port Republic Post Office | Post Office | 39 | Calvert | 38 29 55 N | 076 31 12 W |
| Port Tobacco Post Office | Post Office | 5 | Charles | 38 30 55 N | 077 01 04 W |
| Post Office Road Plaza Shopping Center | Post Office | 61 | Charles | 38 37 07 N | 076 54 03 W |
| Potomac Post Office | Post Office | 104 | Montgomery | 39 01 09 N | 077 12 36 W |
| Powellville Post Office | Post Office | 9 | Wicomico | 38 19 43 N | 075 22 31 W |
| Preston Post Office | Post Office | 10 | Caroline | 38 42 29 N | 075 54 16 W |
| Price Post Office | Post Office | 20 | Queen Anne's | 39 05 54 N | 075 57 25 W |
| Prince Frederick Post Office | Post Office | 40 | Calvert | 38 32 10 N | 076 35 05 W |
| Princess Anne Post Office | Post Office | 4 | Somerset | 38 12 08 N | 075 41 35 W |
| Principio Furnace Post Office (historical) | Post Office | 20 | Cecil | 39 34 40 N | 076 01 58 W |
| Principio Post Office (historical) | Post Office | 96 | Cecil | 39 39 02 N | 076 02 19 W |
| Pylesville Post Office | Post Office | 125 | Harford | 39 40 58 N | 076 22 22 W |
| Quantico Post Office | Post Office | 5 | Wicomico | 38 22 27 N | 075 44 30 W |
| Queen Anne Post Office | Post Office | 7 | Queen Anne's | 38 55 09 N | 075 57 22 W |
| Queenstown Post Office | Post Office | 6 | Queen Anne's | 38 59 25 N | 076 09 26 W |
| Randallstown Post Office | Post Office | 183 | Baltimore | 39 22 08 N | 076 47 59 W |
| Randle Cliffs Post Office (historical) | Post Office | 23 | Calvert | 38 39 55 N | 076 32 54 W |
| Raspeburg Station Baltimore Post Office | Post Office | 70 | Baltimore (city) | 39 21 17 N | 076 31 58 W |
| Rawlings Post Office | Post Office | 236 | Allegany | 39 31 59 N | 078 53 09 W |
| Rehobeth Post Office | Post Office | 1 | Somerset | 38 02 19 N | 075 39 47 W |
| Reisterstown Post Office | Post Office | 219 | Baltimore | 39 27 34 N | 076 49 29 W |
| Rhodesdale Post Office | Post Office | 12 | Dorchester | 38 34 38 N | 075 50 16 W |
| Riderwood Post Office | Post Office | 93 | Baltimore | 39 24 33 N | 076 38 41 W |
| Ridge Post Office | Post Office | 20 | St. Mary's | 38 07 09 N | 076 22 24 W |
| Ridgely Post Office | Post Office | 18 | Caroline | 38 56 32 N | 075 52 54 W |
| Rising Sun Post Office | Post Office | 120 | Cecil | 39 41 57 N | 076 03 43 W |
| Rison Post Office | Post Office | 38 | Charles | 38 32 24 N | 077 11 23 W |
| Riviera Beach Post Office | Post Office | 7 | Anne Arundel | 39 09 25 N | 076 31 05 W |
| Robinson Post Office (historical) | Post Office | 15 | Anne Arundel | 39 04 44 N | 076 33 11 W |
| Rock Hall Post Office | Post Office | 3 | Kent | 39 08 07 N | 076 14 07 W |
| Rock Point Post Office | Post Office | 6 | Charles | 38 16 24 N | 076 50 10 W |
| Rockawalking Post Office (historical) | Post Office | 13 | Wicomico | 38 24 07 N | 075 39 39 W |
| Rocksprings Post Office (historical) | Post Office | 155 | Cecil | 39 42 55 N | 076 09 30 W |
| Rockville Post Office | Post Office | 139 | Montgomery | 39 05 29 N | 077 09 15 W |
| Rocky Ridge Post Office | Post Office | 141 | Frederick | 39 36 20 N | 077 19 09 W |
| Rohrersville Post Office | Post Office | 191 | Washington | 39 26 02 N | 077 39 49 W |
| Rosedale Branch Baltimore Post Office | Post Office | | Baltimore | 39 19 59 N | 076 29 38 W |
| Rowlandsville Post Office (historical) | Post Office | 25 | Cecil | 39 39 52 N | 076 08 52 W |
| Royal Oak Post Office | Post Office | 1 | Talbot | 38 44 33 N | 076 10 45 W |
| Rumbley Post Office | Post Office | 0 | Somerset | 38 05 41 N | 075 51 41 W |
| Sabillasville Post Office | Post Office | 351 | Frederick | 39 42 27 N | 077 27 46 W |
| Saint Augustine Post Office (historical) | Post Office | 23 | Cecil | 39 29 39 N | 075 48 34 W |
| Saint Inigoes Post Office | Post Office | 24 | St. Mary's | 38 09 16 N | 076 23 39 W |
| Saint James Post Office | Post Office | 147 | Washington | 39 33 51 N | 077 45 20 W |
| Saint James School Post Office (historical) | Post Office | 158 | Washington | 39 34 52 N | 077 43 57 W |
| Saint Leonard Post Office | Post Office | 34 | Calvert | 38 28 30 N | 076 30 24 W |
| Saint Marys City Post Office | Post Office | 7 | St. Mary's | 38 11 10 N | 076 25 53 W |
| Saint Michaels Post Office | Post Office | 3 | Talbot | 38 47 05 N | 076 13 27 W |
| Salisbury Post Office | Post Office | 2 | Wicomico | 38 21 57 N | 075 35 53 W |
| Sandy Spring Post Office | Post Office | 149 | Montgomery | 39 08 59 N | 077 01 40 W |
| Sang Run Post Office | Post Office | 615 | Garrett | 39 34 02 N | 079 25 26 W |
| Sassafras and Oak Post Office (historical) | Post Office | 46 | St. Mary's | 38 21 08 N | 076 34 41 W |
| Savage Post Office | Post Office | 60 | Howard | 39 08 16 N | 076 49 22 W |
| Scotland Beach Post Office (historical) | Post Office | 0 | St. Mary's | 38 04 17 N | 076 19 47 W |
| Scotland Post Office | Post Office | 5 | St. Mary's | 38 05 13 N | 076 21 30 W |
| Secretary Post Office | Post Office | 3 | Dorchester | 38 36 35 N | 075 57 09 W |
| Security Post Office (historical) | Post Office | 152 | Washington | 39 39 03 N | 077 41 20 W |
| Severn Post Office | Post Office | 46 | Anne Arundel | 39 08 10 N | 076 41 19 W |
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