Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| City of Hagerstown Fire Department | Building | | Washington | 40 04 53 N | 078 12 33 W |
| City of Havre De Grace Police Department | Building | | Harford | 39 55 25 N | 076 09 11 W |
| City Spring Elementary School | School | 7 | Baltimore (city) | 39 17 22 N | 076 35 51 W |
| Civista Health Center | Hospital | 54 | Charles | 38 37 22 N | 077 04 26 W |
| Civista Medical Center | Hospital | 55 | Charles | 38 31 49 N | 076 58 21 W |
| Civista Surgery Center | Hospital | 62 | Charles | 38 37 00 N | 076 54 58 W |
| Civista Women's Health Center | Hospital | 62 | Charles | 38 37 00 N | 076 54 58 W |
| Clagett Island | Island | 52 | Montgomery | 39 02 13 N | 077 16 28 W |
| Claggerts Forest | Populated Place | 75 | Harford | 39 28 26 N | 076 21 20 W |
| Claggett Diocesan Center | School | 101 | Frederick | 39 19 00 N | 077 25 39 W |
| Claggett Run | Stream | | Frederick | 39 19 53 N | 077 25 29 W |
| Claggetts Mill (historical) | Locale | 135 | Washington | 39 35 43 N | 077 42 34 W |
| Claggettsville | Populated Place | 226 | Montgomery | 39 19 02 N | 077 11 52 W |
| Clahamman Hills | Populated Place | 47 | Calvert | 38 33 35 N | 076 33 58 W |
| Claiborne | Populated Place | 3 | Talbot | 38 50 15 N | 076 16 40 W |
| Claiborne Post Office | Post Office | 3 | Talbot | 38 50 12 N | 076 16 31 W |
| Claiborne United Methodist Church | Church | 3 | Talbot | 38 50 10 N | 076 16 30 W |
| Claiborne-Romancoke Ferry (historical) | Crossing | -3 | Talbot | 38 50 58 N | 076 18 26 W |
| Claibornes Landing | Populated Place | 2 | Queen Anne's | 38 54 55 N | 076 20 53 W |
| Clam Harbor Tumps | Bar | -2 | Worcester | 38 01 57 N | 075 19 49 W |
| Claphams Point | Cape | 0 | Baltimore | 39 14 52 N | 076 29 37 W |
| Clara | Populated Place | 1 | Wicomico | 38 16 33 N | 075 49 12 W |
| Clara Barton Elementary School (historical) | School | 48 | Montgomery | 38 58 24 N | 077 09 10 W |
| Clara Barton House | Building | 42 | Montgomery | 38 58 01 N | 077 08 27 W |
| Claremont (historical) | Populated Place | 22 | Baltimore (city) | 39 16 27 N | 076 39 20 W |
| Claremont Trainable School | School | 34 | Baltimore (city) | 39 18 09 N | 076 33 16 W |
| Clarence Perkins Homes | Populated Place | 6 | Baltimore (city) | 39 17 15 N | 076 35 49 W |
| Clark Bridge | Bridge | 70 | Harford | 39 37 44 N | 076 22 32 W |
| Clark Chapel | Church | 137 | Harford | 39 36 12 N | 076 18 04 W |
| Clark Corners | Locale | 20 | Queen Anne's | 39 04 38 N | 075 56 03 W |
| Clark Point | Cape | -7 | Baltimore | 39 19 03 N | 076 25 30 W |
| Clark Run | Stream | | Charles | 38 26 57 N | 076 56 31 W |
| Clark Run | Stream | | Garrett | 39 19 37 N | 079 25 46 W |
| Clark Run Nature Area | Park | 34 | Charles | 38 31 13 N | 076 57 45 W |
| Clarks Landing | Populated Place | 3 | St. Mary's | 38 20 32 N | 076 30 15 W |
| Clarks Run (subdivision) | Populated Place | 49 | Charles | 38 31 09 N | 076 57 19 W |
| Clarksbrook Estates | Populated Place | 184 | Montgomery | 39 14 01 N | 077 16 01 W |
| Clarksburg | Populated Place | 202 | Montgomery | 39 14 19 N | 077 16 46 W |
| Clarksburg Community Center | Building | 167 | Montgomery | 39 13 32 N | 077 15 50 W |
| Clarksburg Elementary School | School | 197 | Montgomery | 39 14 12 N | 077 16 53 W |
| Clarksburg Heights | Populated Place | 163 | Montgomery | 39 13 25 N | 077 15 50 W |
| Clarksburg Methodist Church | Church | 203 | Montgomery | 39 14 28 N | 077 16 47 W |
| Clarksburg Post Office | Post Office | 198 | Montgomery | 39 14 19 N | 077 16 43 W |
| Clarkson | Populated Place | 151 | Howard | 39 17 53 N | 076 56 08 W |
| Clarksville | Populated Place | 155 | Howard | 39 12 23 N | 076 56 35 W |
| Clarksville Elementary School | School | 156 | Howard | 39 13 06 N | 076 55 45 W |
| Clarksville Environmental Area | Park | 117 | Howard | 39 13 26 N | 076 55 04 W |
| Clarksville Fire Station | Building | 149 | Howard | 39 12 28 N | 076 56 20 W |
| Clarksville Meadows | Populated Place | 142 | Howard | 39 11 20 N | 076 54 36 W |
| Clarksville Middle School | School | 148 | Howard | 39 11 24 N | 076 55 24 W |
| Clarksville Post Office | Post Office | 154 | Howard | 39 12 31 N | 076 56 27 W |
| Clarksville Ridge | Populated Place | 128 | Howard | 39 11 04 N | 076 54 44 W |
| Clarksville Volunteer Fire Department Station 5 | Building | | Howard | 39 21 31 N | 077 34 08 W |
| Clarys Forest | Populated Place | 141 | Howard | 39 12 42 N | 076 53 29 W |
| Clarysville | Populated Place | 457 | Allegany | 39 38 33 N | 078 53 18 W |
| Clarysville Bridge | Bridge | 455 | Allegany | 39 38 35 N | 078 53 22 W |
| Claw Point | Cape | 0 | Somerset | 38 07 03 N | 075 56 07 W |
| Clay Island | Island | 0 | Dorchester | 38 14 10 N | 075 57 42 W |
| Clay Island Bend | Bend | -4 | Dorchester | 38 15 12 N | 075 57 54 W |
| Clay Island Creek | Bay | -3 | Dorchester | 38 14 39 N | 075 57 26 W |
| Clay Island Marsh | Swamp | 0 | Dorchester | 38 15 20 N | 075 57 38 W |
| Clay Point | Cape | 0 | Dorchester | 38 20 39 N | 076 13 57 W |
| Claybank Point | Cape | 0 | Baltimore | 39 14 53 N | 076 24 53 W |
| Claysville | Populated Place | 171 | Montgomery | 39 11 38 N | 077 07 28 W |
| Clayton | Populated Place | 54 | Harford | 39 27 01 N | 076 21 17 W |
| Clayton Manor | Populated Place | 33 | Harford | 39 26 50 N | 076 20 16 W |
| Clayton Marina | Locale | -5 | St. Mary's | 38 06 42 N | 076 24 19 W |
| Clayton Road Park | Park | 26 | Harford | 39 26 43 N | 076 20 15 W |
| Clayton Run Estates | Populated Place | 57 | Charles | 38 35 23 N | 076 47 54 W |
| Clayton Station | Locale | 25 | Harford | 39 26 09 N | 076 19 59 W |
| Clayton Station Business Center | Locale | 32 | Harford | 39 26 05 N | 076 19 54 W |
| Clear Acres | Populated Place | 52 | Harford | 39 26 44 N | 076 22 31 W |
| Clear Ridge | Populated Place | 206 | Carroll | 39 34 58 N | 077 07 28 W |
| Clear Spring | Populated Place | 174 | Washington | 39 39 22 N | 077 55 54 W |
| Clear Spring | Spring | 167 | Washington | 39 39 19 N | 077 55 48 W |
| Clear Spring Elementary School | School | 182 | Washington | 39 39 24 N | 077 56 03 W |
| Clear Spring Estates | Populated Place | 182 | Harford | 39 34 24 N | 076 27 56 W |
| Clear Spring High School | School | 183 | Washington | 39 39 29 N | 077 56 13 W |
| Clear Spring Middle School | School | 178 | Washington | 39 39 30 N | 077 56 07 W |
| Clear Spring Park | Park | 119 | Montgomery | 39 11 13 N | 077 14 01 W |
| Clear Spring Park | Park | 175 | Washington | 39 39 16 N | 077 56 03 W |
| Clear Spring Post Office | Post Office | 172 | Washington | 39 39 20 N | 077 55 42 W |
| Clear Spring Station (historical) | Locale | 128 | Washington | 39 37 42 N | 077 56 21 W |
| Clear Spring Town Hall | Building | 177 | Washington | 39 39 24 N | 077 55 45 W |
| Clear Spring Water Reservoir | Reservoir | 50 | Baltimore | 39 15 30 N | 076 42 23 W |
| Clear Spring Water Reservoir Dam | Dam | 50 | Baltimore | 39 15 30 N | 076 42 23 W |
| Clear View | Populated Place | 99 | Frederick | 39 24 00 N | 077 22 38 W |
| Clear View (subdivision) | Populated Place | 252 | Carroll | 39 35 45 N | 076 50 28 W |
| Clear Water Beach | Populated Place | 5 | Anne Arundel | 39 09 59 N | 076 31 38 W |
| Clearfield | Populated Place | 249 | Carroll | 39 32 58 N | 076 57 11 W |
| Clearspring Elementary School | School | 236 | Montgomery | 39 15 58 N | 077 12 29 W |
| Clearspring Manor | Populated Place | 238 | Montgomery | 39 16 21 N | 077 12 22 W |
| Clearview | Populated Place | 104 | Cecil | 39 39 50 N | 076 04 29 W |
| Clearview | Populated Place | 25 | Harford | 39 27 01 N | 076 17 34 W |
| Clearview | Populated Place | 17 | Talbot | 38 48 31 N | 076 03 24 W |
| Clearview | Populated Place | 191 | Washington | 39 43 01 N | 077 44 25 W |
| Clearview Airpark | Airport | 238 | Carroll | 39 28 01 N | 077 01 03 W |
| Clearview North | Populated Place | 46 | Calvert | 38 42 48 N | 076 33 55 W |
| Clearview School (historical) | School | 140 | Carroll | 39 38 54 N | 077 13 22 W |
| Clearview Village | Populated Place | 18 | Anne Arundel | 39 07 23 N | 076 32 09 W |
| Cleavers Corner | Populated Place | 19 | Kent | 39 16 16 N | 075 58 37 W |
| Cleaves Fork | Populated Place | 22 | Caroline | 39 07 58 N | 075 47 14 W |
| Clem Point | Cape | 3 | St. Mary's | 38 14 50 N | 076 41 53 W |
| Clemens Crossing | Populated Place | 112 | Howard | 39 11 50 N | 076 52 34 W |
| Clemens Crossing Elementary School | School | 109 | Howard | 39 11 36 N | 076 52 18 W |
| Clement Cove | Bay | 0 | Baltimore | 39 14 16 N | 076 30 04 W |
| Clements | Populated Place | 4 | St. Mary's | 38 19 34 N | 076 43 38 W |
| Clements Creek | Bay | -3 | Anne Arundel | 39 01 07 N | 076 31 39 W |
| Clements Creek Seaplane Base | Airport | -3 | Anne Arundel | 39 01 16 N | 076 31 22 W |
| Clements Post Office | Post Office | 13 | St. Mary's | 38 18 48 N | 076 43 16 W |