Feature Name | Class | Elev.
meters | County | Latitude
DMS | Longitude
DMS |
| Clarksville Post Office | Post Office | 154 | Howard | 39 12 31 N | 076 56 27 W |
| Clear Spring Post Office | Post Office | 172 | Washington | 39 39 20 N | 077 55 42 W |
| Clements Post Office | Post Office | 13 | St. Mary's | 38 18 48 N | 076 43 16 W |
| Clifton-East End Station Baltimore Post Office | Post Office | 18 | Baltimore (city) | 39 19 01 N | 076 33 20 W |
| Clinton Post Office | Post Office | 74 | Prince George's | 38 45 53 N | 076 53 59 W |
| Cobb Island Post Office | Post Office | 6 | Charles | 38 15 46 N | 076 51 02 W |
| Colesville Post Office | Post Office | 123 | Montgomery | 39 04 21 N | 077 00 08 W |
| Colora Post Office | Post Office | 91 | Cecil | 39 40 21 N | 076 05 57 W |
| Coltons Point Post Office | Post Office | 3 | St. Mary's | 38 13 28 N | 076 45 11 W |
| Columbia Post Office | Post Office | 120 | Howard | 39 11 06 N | 076 49 18 W |
| Compton Post Office | Post Office | 7 | St. Mary's | 38 16 37 N | 076 41 35 W |
| Conowingo Post Office | Post Office | 84 | Cecil | 39 40 37 N | 076 09 42 W |
| Cooksville Post Office | Post Office | 186 | Howard | 39 19 15 N | 077 01 11 W |
| Cordova Post Office | Post Office | 14 | Talbot | 38 52 29 N | 075 59 44 W |
| Cornfield Harbor Post Office (historical) | Post Office | 2 | St. Mary's | 38 03 39 N | 076 21 40 W |
| Corriganville Post Office | Post Office | 225 | Allegany | 39 41 34 N | 078 47 35 W |
| Courthouse Station Post Office | Post Office | 138 | Montgomery | 39 05 02 N | 077 09 12 W |
| Crapo Post Office | Post Office | 0 | Dorchester | 38 19 04 N | 076 07 37 W |
| Crellin Post Office | Post Office | 730 | Garrett | 39 23 20 N | 079 27 59 W |
| Cresaptown Post Office | Post Office | 246 | Allegany | 39 35 32 N | 078 50 08 W |
| Crisfield Post Office | Post Office | 1 | Somerset | 37 58 52 N | 075 51 24 W |
| Crofton Post Office | Post Office | 30 | Anne Arundel | 38 59 21 N | 076 41 53 W |
| Crownsville Post Office | Post Office | 44 | Anne Arundel | 39 01 52 N | 076 36 12 W |
| Crumpton Post Office | Post Office | 6 | Queen Anne's | 39 14 26 N | 075 55 19 W |
| Cumberland Post Office | Post Office | 189 | Allegany | 39 39 02 N | 078 45 44 W |
| Damascus Post Office | Post Office | 260 | Montgomery | 39 17 15 N | 077 12 13 W |
| Dameron Post Office | Post Office | 27 | St. Mary's | 38 09 09 N | 076 22 12 W |
| Dames Quarter Post Office | Post Office | 1 | Somerset | 38 11 17 N | 075 53 51 W |
| Dares Wharf Post Office (historical) | Post Office | 35 | Calvert | 38 30 30 N | 076 32 29 W |
| Darlington Post Office | Post Office | 98 | Harford | 39 38 25 N | 076 12 09 W |
| Davidsonville Post Office | Post Office | 54 | Anne Arundel | 38 55 22 N | 076 37 43 W |
| Dayton Post Office | Post Office | 181 | Howard | 39 14 11 N | 076 59 05 W |
| Deal Island Post Office | Post Office | 1 | Somerset | 38 09 50 N | 075 56 54 W |
| Deale Post Office | Post Office | 2 | Anne Arundel | 38 46 53 N | 076 33 13 W |
| Deer Park Post Office | Post Office | 772 | Garrett | 39 25 25 N | 079 19 35 W |
| Denton Post Office | Post Office | 13 | Caroline | 38 53 08 N | 075 49 44 W |
| Derwood Post Office | Post Office | 150 | Montgomery | 39 08 42 N | 077 08 39 W |
| Detour Post Office | Post Office | 103 | Carroll | 39 36 13 N | 077 16 06 W |
| Diamond Farms Post Office | Post Office | 121 | Montgomery | 39 08 06 N | 077 08 35 W |
| Dickerson Post Office | Post Office | 104 | Montgomery | 39 13 08 N | 077 25 28 W |
| Dowell Post Office | Post Office | 1 | Calvert | 38 20 17 N | 076 27 09 W |
| Drayden Post Office | Post Office | 12 | St. Mary's | 38 10 37 N | 076 28 53 W |
| Druid Station Baltimore Post Office | Post Office | 53 | Baltimore (city) | 39 18 15 N | 076 38 10 W |
| Dunkirk Post Office | Post Office | 45 | Calvert | 38 43 08 N | 076 39 36 W |
| Earleville Post Office | Post Office | 24 | Cecil | 39 24 47 N | 075 54 52 W |
| East New Market Post Office | Post Office | 13 | Dorchester | 38 35 53 N | 075 55 23 W |
| Easton Post Office | Post Office | 8 | Talbot | 38 46 25 N | 076 04 24 W |
| Eckhart Mines Post Office | Post Office | 531 | Allegany | 39 39 02 N | 078 54 00 W |
| Eden Post Office | Post Office | 7 | Somerset | 38 16 53 N | 075 39 07 W |
| Edgewater Post Office | Post Office | 6 | Anne Arundel | 38 56 16 N | 076 33 36 W |
| Edgewood Post Office | Post Office | 22 | Harford | 39 25 41 N | 076 17 54 W |
| Elk Mills Post Office | Post Office | 45 | Cecil | 39 39 30 N | 075 49 36 W |
| Elkton Post Office | Post Office | 8 | Cecil | 39 36 25 N | 075 49 57 W |
| Ellerslie Post Office | Post Office | 224 | Allegany | 39 43 17 N | 078 46 29 W |
| Ellicott City Post Office | Post Office | 57 | Howard | 39 16 04 N | 076 47 59 W |
| Ellicott Mills Station Post Office | Post Office | 58 | Howard | 39 16 03 N | 076 47 56 W |
| Elliott Post Office | Post Office | -3 | Dorchester | 38 17 32 N | 076 00 14 W |
| Emmitsburg Post Office | Post Office | 128 | Frederick | 39 42 05 N | 077 19 41 W |
| Emorygrove Post Office (historical) | Post Office | 203 | Baltimore | 39 28 55 N | 076 49 00 W |
| Enchanted Forest Postal Store | Post Office | 113 | Howard | 39 16 51 N | 076 51 18 W |
| Essex Branch Baltimore Post Office | Post Office | | Baltimore | 39 18 25 N | 076 28 35 W |
| Ewell Post Office | Post Office | 0 | Somerset | 37 59 45 N | 076 02 10 W |
| Fairhill Post Office (historical) | Post Office | 116 | Cecil | 39 42 10 N | 075 52 07 W |
| Fairlee Post Office (historical) | Post Office | 18 | Kent | 39 13 23 N | 076 10 21 W |
| Fairplay Post Office | Post Office | 147 | Washington | 39 32 25 N | 077 44 19 W |
| Fallston Post Office | Post Office | 141 | Harford | 39 30 50 N | 076 24 38 W |
| Farmington Post Office (historical) | Post Office | 128 | Cecil | 39 40 43 N | 076 01 59 W |
| Faulkner Post Office | Post Office | 46 | Charles | 38 26 18 N | 076 58 38 W |
| Federal Hill Post Office (historical) | Post Office | 180 | Harford | 39 38 31 N | 076 28 19 W |
| Federalsburg Post Office | Post Office | 8 | Caroline | 38 41 40 N | 075 46 36 W |
| Fenwicks Tavern Post Office (historical) | Post Office | 41 | St. Mary's | 38 22 20 N | 076 36 27 W |
| Finksburg Post Office | Post Office | 170 | Carroll | 39 29 30 N | 076 53 05 W |
| Flintstone Post Office | Post Office | 252 | Allegany | 39 42 12 N | 078 34 08 W |
| Forest Hill Post Office | Post Office | 174 | Harford | 39 35 02 N | 076 23 15 W |
| Fork Post Office | Post Office | 130 | Baltimore | 39 28 05 N | 076 26 33 W |
| Fort Howard Post Office | Post Office | 5 | Baltimore | 39 12 31 N | 076 26 37 W |
| Fort Washington Post Office | Post Office | 16 | Prince George's | 38 43 48 N | 076 59 30 W |
| Franklin Station Baltimore Post Office | Post Office | 25 | Baltimore (city) | 39 16 49 N | 076 39 16 W |
| Frederick Post Office | Post Office | 87 | Frederick | 39 24 51 N | 077 24 27 W |
| Freeland Post Office | Post Office | 272 | Baltimore | 39 43 03 N | 076 42 24 W |
| Friendship Post Office | Post Office | 44 | Anne Arundel | 38 44 13 N | 076 35 29 W |
| Frostburg Post Office | Post Office | 633 | Allegany | 39 39 29 N | 078 55 44 W |
| Fruitland Post Office | Post Office | 12 | Wicomico | 38 19 14 N | 075 37 08 W |
| Fulton Post Office | Post Office | 144 | Howard | 39 09 04 N | 076 55 24 W |
| Funkstown Post Office | Post Office | 149 | Washington | 39 36 35 N | 077 42 29 W |
| Gaither Post Office | Post Office | 136 | Carroll | 39 21 44 N | 076 59 32 W |
| Gaithersburg Post Office | Post Office | 153 | Montgomery | 39 08 28 N | 077 10 36 W |
| Galena Post Office | Post Office | 22 | Kent | 39 20 31 N | 075 52 44 W |
| Galesville Post Office | Post Office | 0 | Anne Arundel | 38 50 38 N | 076 32 39 W |
| Gambrills Post Office | Post Office | 48 | Anne Arundel | 39 04 05 N | 076 40 08 W |
| Gapland Post Office | Post Office | 204 | Washington | 39 24 21 N | 077 39 37 W |
| Garrett Park Post Office | Post Office | 89 | Montgomery | 39 02 17 N | 077 05 36 W |
| Garrison Post Office | Post Office | 136 | Baltimore | 39 24 22 N | 076 45 39 W |
| Germantown Post Office | Post Office | 154 | Montgomery | 39 10 47 N | 077 16 16 W |
| Gibson Island Post Office | Post Office | 11 | Anne Arundel | 39 04 37 N | 076 25 29 W |
| Girdletree Post Office | Post Office | 11 | Worcester | 38 05 41 N | 075 23 51 W |
| Glen Arm Post Office | Post Office | 99 | Baltimore | 39 27 16 N | 076 29 42 W |
| Glen Burnie Post Office | Post Office | 20 | Anne Arundel | 39 09 30 N | 076 37 13 W |
| Glen Echo Post Office | Post Office | 43 | Montgomery | 38 58 10 N | 077 08 31 W |
| Glenelg Post Office | Post Office | 195 | Howard | 39 15 53 N | 076 59 32 W |
| Glenwood Post Office | Post Office | 168 | Howard | 39 17 24 N | 077 01 40 W |
| Glyndon Post Office | Post Office | 205 | Baltimore | 39 28 30 N | 076 49 10 W |
| Goldsboro Post Office | Post Office | 17 | Caroline | 39 02 08 N | 075 47 15 W |
| Golts Post Office | Post Office | 23 | Kent | 39 20 18 N | 075 46 30 W |
| Govans Station Baltimore Post Office | Post Office | 100 | Baltimore (city) | 39 20 55 N | 076 36 36 W |
| Grasonville Post Office | Post Office | 5 | Queen Anne's | 38 57 32 N | 076 12 25 W |
| Gratitude Post Office (historical) | Post Office | 1 | Kent | 39 08 30 N | 076 15 39 W |
| Great Mills Post Office | Post Office | 2 | St. Mary's | 38 14 15 N | 076 30 01 W |
| Greensboro Post Office | Post Office | 8 | Caroline | 38 58 29 N | 075 48 29 W |
| Guard Post Office (historical) | Post Office | 439 | Garrett | 39 42 51 N | 079 23 21 W |
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