Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| College Run | Stream | | Frederick | 39 28 52 N | 077 20 04 W |
| College Station | Populated Place | 13 | Anne Arundel | 39 03 17 N | 076 31 19 W |
| College View | Populated Place | 125 | Montgomery | 39 02 35 N | 077 03 55 W |
| Collier Creek | Stream | | Wicomico | 38 21 31 N | 075 51 08 W |
| Collier Hollow | Valley | | Garrett | 39 42 56 N | 079 23 02 W |
| Collier Hollow | Valley | | Garrett | 39 42 57 N | 079 23 01 W |
| Collier Island | Island | -3 | Worcester | 38 21 50 N | 075 05 30 W |
| Collier Islands (historical) | Island | 1 | Worcester | 38 21 28 N | 075 04 54 W |
| Collier Mountain | Summit | 444 | Allegany | 39 37 10 N | 078 40 56 W |
| Collier Run | Stream | | Allegany | 39 34 00 N | 078 43 30 W |
| Collier Run | Stream | | Garrett | 39 42 52 N | 079 23 04 W |
| Collington | Populated Place | 55 | Prince George's | 38 58 06 N | 076 45 35 W |
| Collington Branch | Stream | | Prince George's | 38 49 11 N | 076 44 49 W |
| Collington Branch Park | Park | 31 | Prince George's | 38 56 10 N | 076 44 50 W |
| Collington Lake | Reservoir | 34 | Prince George's | 38 55 12 N | 076 49 36 W |
| Collington Plaza Shopping Center | Locale | 32 | Prince George's | 38 56 15 N | 076 43 09 W |
| Collington School (historical) | School | 51 | Prince George's | 38 57 39 N | 076 45 58 W |
| Collington Square | Park | 38 | Baltimore (city) | 39 18 22 N | 076 35 12 W |
| Collington Square Elementary School | School | 43 | Baltimore (city) | 39 18 26 N | 076 35 12 W |
| Collingwood | Populated Place | 3 | St. Mary's | 38 15 32 N | 076 44 51 W |
| Collins Estates | Populated Place | 177 | Carroll | 39 25 11 N | 076 57 39 W |
| Collins Fishery | Locale | 3 | Cecil | 39 29 24 N | 075 57 11 W |
| Collins Gut | Stream | | Wicomico | 38 17 01 N | 075 44 47 W |
| Collins Temple Church | Church | 10 | Worcester | 38 08 02 N | 075 23 40 W |
| Collins Wharf | Locale | 1 | Wicomico | 38 17 59 N | 075 45 25 W |
| Collison Corner | Populated Place | 25 | Anne Arundel | 38 54 54 N | 076 33 07 W |
| Collmus | Populated Place | 158 | Frederick | 39 24 20 N | 077 15 34 W |
| Colmar Manor | Populated Place | 9 | Prince George's | 38 55 59 N | 076 56 45 W |
| Colmar Manor School | School | 4 | Prince George's | 38 55 53 N | 076 56 56 W |
| Colonel E Brooke Lee Middle School | School | 128 | Montgomery | 39 02 59 N | 077 01 51 W |
| Colonel Richardson High School | School | 16 | Caroline | 38 45 17 N | 075 49 42 W |
| Colonel Richardson Middle School | School | 16 | Caroline | 38 45 17 N | 075 49 33 W |
| Colonel Zadok Magruder High School | School | 132 | Montgomery | 39 07 53 N | 077 07 06 W |
| Colonial Acres | Populated Place | 37 | Cecil | 39 37 57 N | 075 50 45 W |
| Colonial Acres | Populated Place | 106 | Harford | 39 31 05 N | 076 19 34 W |
| Colonial Acres | Populated Place | 15 | Wicomico | 38 22 45 N | 075 31 16 W |
| Colonial Annapolis Historic District | Park | 12 | Anne Arundel | 38 58 44 N | 076 29 27 W |
| Colonial Church | Church | 147 | Baltimore | 39 22 00 N | 076 42 57 W |
| Colonial Gardens | Populated Place | 144 | Baltimore | 39 16 35 N | 076 45 31 W |
| Colonial Heights (subdivision) | Populated Place | 158 | Frederick | 39 37 45 N | 077 24 01 W |
| Colonial Heights (subdivision) | Populated Place | 8 | Talbot | 38 46 58 N | 076 04 29 W |
| Colonial Hills | Populated Place | 190 | Carroll | 39 40 45 N | 077 06 37 W |
| Colonial Island | Island | 73 | Frederick | 39 19 29 N | 077 40 06 W |
| Colonial Manor | Populated Place | 48 | Anne Arundel | 39 07 53 N | 076 40 24 W |
| Colonial Manor Trailer Park | Populated Place | 32 | Anne Arundel | 39 01 58 N | 076 27 55 W |
| Colonial Park | Populated Place | 129 | Baltimore | 39 18 22 N | 076 43 14 W |
| Colonial Park | Populated Place | 151 | Washington | 39 37 46 N | 077 41 50 W |
| Colonial Parole Shopping Center | Locale | 19 | Anne Arundel | 38 58 40 N | 076 32 09 W |
| Colonial Shopping Center | Locale | 145 | Baltimore | 39 21 47 N | 076 42 44 W |
| Colonial Shopping Center | Locale | 107 | Montgomery | 39 03 27 N | 077 04 58 W |
| Colonial Village | Populated Place | 145 | Baltimore (city) | 39 21 35 N | 076 42 37 W |
| Colony Acres | Populated Place | 119 | Cecil | 39 38 47 N | 076 04 31 W |
| Colony Fairfield | Populated Place | 80 | Anne Arundel | 39 07 15 N | 076 45 44 W |
| Colony Hills (subdivision) | Populated Place | 7 | Anne Arundel | 38 58 08 N | 076 29 44 W |
| Colony Ridge | Populated Place | 59 | Anne Arundel | 39 04 27 N | 076 41 05 W |
| Colony Square | Populated Place | 34 | St. Mary's | 38 15 27 N | 076 26 59 W |
| Colony Village (subdivision) | Populated Place | 98 | Frederick | 39 29 05 N | 077 20 46 W |
| Colora | Populated Place | 91 | Cecil | 39 40 19 N | 076 05 55 W |
| Colora Meetinghouse | Church | 92 | Cecil | 39 40 33 N | 076 05 55 W |
| Colora Post Office | Post Office | 91 | Cecil | 39 40 21 N | 076 05 57 W |
| Colter Industrial Park | Locale | 123 | Montgomery | 39 06 07 N | 077 08 34 W |
| Colton Villa Nursing Home | Hospital | 158 | Washington | 39 38 06 N | 077 42 09 W |
| Coltons Point | Cape | 3 | St. Mary's | 38 13 22 N | 076 45 08 W |
| Coltons Point | Populated Place | 3 | St. Mary's | 38 13 28 N | 076 45 12 W |
| Coltons Point Post Office | Post Office | 3 | St. Mary's | 38 13 28 N | 076 45 11 W |
| Columbia | Populated Place | 124 | Howard | 39 14 25 N | 076 50 22 W |
| Columbia 100 Office Research Park | Locale | 144 | Howard | 39 13 37 N | 076 48 59 W |
| Columbia Academy | School | 119 | Howard | 39 10 44 N | 076 52 20 W |
| Columbia Beach | Populated Place | 0 | Anne Arundel | 38 49 04 N | 076 30 02 W |
| Columbia Church | Church | 153 | Montgomery | 39 07 01 N | 076 56 00 W |
| Columbia Country Club | Locale | 89 | Montgomery | 38 59 21 N | 077 04 42 W |
| Columbia Forest | Populated Place | 97 | Montgomery | 38 59 24 N | 077 05 09 W |
| Columbia Hills | Populated Place | 122 | Howard | 39 14 31 N | 076 49 44 W |
| Columbia Lng Secondary Dam | Dam | 27 | Calvert | 38 23 24 N | 076 24 59 W |
| Columbia Montessori School | School | 130 | Howard | 39 13 23 N | 076 52 32 W |
| Columbia Park | Park | 138 | Montgomery | 39 06 08 N | 076 56 39 W |
| Columbia Park | Populated Place | 55 | Charles | 38 35 35 N | 077 00 22 W |
| Columbia Park | Populated Place | 29 | Prince George's | 38 55 03 N | 076 53 18 W |
| Columbia Park Elementary School | School | 30 | Prince George's | 38 55 00 N | 076 53 14 W |
| Columbia Post Office | Post Office | 120 | Howard | 39 11 06 N | 076 49 18 W |
| Columbia Presbyterian Church | Church | 123 | Howard | 39 14 11 N | 076 51 27 W |
| Columbia Street School (historical) | School | 200 | Allegany | 39 39 31 N | 078 45 57 W |
| Columbia Union College | School | 67 | Montgomery | 38 59 05 N | 076 59 58 W |
| Columbus Center For Marine Biology | Building | | Baltimore (city) | 39 17 11 N | 076 36 20 W |
| Columbus School | School | 32 | Baltimore (city) | 39 18 45 N | 076 35 23 W |
| Combination School | School | 840 | Garrett | 39 23 53 N | 079 16 20 W |
| Combs Creek | Stream | | St. Mary's | 38 15 39 N | 076 41 31 W |
| Comegys Bight | Bay | -3 | Kent | 39 06 40 N | 076 07 45 W |
| Comegys Creek | Stream | | Kent | 39 07 14 N | 076 07 48 W |
| Comet Roller Mills (historical) | Locale | 140 | Carroll | 39 29 43 N | 076 54 09 W |
| Commerce Industrial Park | Locale | | Baltimore | 39 15 01 N | 076 40 27 W |
| Commerce Park | Locale | 35 | Calvert | 38 32 36 N | 076 35 18 W |
| Commons Building | Building | 11 | Wicomico | 38 20 37 N | 075 36 32 W |
| Commons Corporate Center | Locale | 54 | Anne Arundel | 39 09 37 N | 076 42 34 W |
| Community Baptist Church | Church | 48 | Baltimore (city) | 39 17 28 N | 076 38 38 W |
| Community Baptist Church | Church | 60 | Howard | 39 10 06 N | 076 47 27 W |
| Community Church | Church | 216 | Baltimore | 39 27 58 N | 076 49 44 W |
| Community Church | Church | 97 | Montgomery | 39 04 59 N | 077 19 31 W |
| Community Church | Church | 58 | Prince George's | 39 05 04 N | 076 51 27 W |
| Community Church | Church | 5 | Queen Anne's | 38 58 12 N | 076 14 37 W |
| Community College at Calvert County | School | 49 | Calvert | 38 29 29 N | 076 32 16 W |
| Community College of Baltimore | School | 106 | Baltimore (city) | 39 19 11 N | 076 39 44 W |
| Community College of Baltimore County Catonsville | School | 134 | Baltimore | 39 15 10 N | 076 44 07 W |
| Community College of Baltimore County Dundalk | School | 27 | Baltimore | 39 15 57 N | 076 30 50 W |
| Community College of Baltimore County Essex | School | 59 | Baltimore | 39 21 13 N | 076 28 53 W |
| Community College of Baltimore Harbor Campus | School | 3 | Baltimore (city) | 39 17 16 N | 076 36 27 W |
| Community Evangelical Church | Church | 104 | Baltimore (city) | 39 21 51 N | 076 33 32 W |
| Community Fire Company | Building | | Cecil | 39 56 24 N | 076 06 56 W |
| Community Fire Company Station 18 | Building | | Cecil | 40 10 24 N | 076 38 30 W |
| Community Fire Company Station 8 | Building | | Cecil | 40 09 28 N | 076 06 12 W |