Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Cecil County Poor House (historical) | Building | 60 | Cecil | 39 39 11 N | 075 51 25 W |
| Cecil County Public Library | Building | 9 | Cecil | 39 36 31 N | 075 49 42 W |
| Cecil County Sheriffs Office | Building | | Cecil | 40 00 32 N | 076 24 02 W |
| Cecilton Branch Cecil County Public Library | Building | 23 | Cecil | 39 24 14 N | 075 51 51 W |
| Cecilton Town Hall | Building | 21 | Cecil | 39 24 16 N | 075 52 09 W |
| Cecilton Volunteer Fire Company | Building | | Cecil | 39 40 40 N | 076 27 12 W |
| Center for Learning & Technology | Building | | Prince George's | 39 01 09 N | 076 45 38 W |
| Center for the Arts | Building | 122 | Baltimore | 39 23 30 N | 076 36 46 W |
| Center for the Handicapped | Building | 107 | Montgomery | 39 01 51 N | 077 01 35 W |
| Central Fire Station | Building | 190 | Allegany | 39 39 10 N | 078 45 46 W |
| Centreville City Police Department | Building | | Queen Anne's | 39 05 12 N | 076 06 31 W |
| Centreville Police Department | Building | | Queen Anne's | 39 05 10 N | 076 06 32 W |
| Centreville Town Hall | Building | 19 | Queen Anne's | 39 02 40 N | 076 03 56 W |
| Chapel Oaks Volunteer Fire Department Company 38 | Building | | Prince George's | 39 31 02 N | 077 31 11 W |
| Charles Carroll House | Building | | Anne Arundel | 38 58 27 N | 076 29 16 W |
| Charles County Courthouse | Building | 56 | Charles | 38 31 48 N | 076 58 43 W |
| Charles County Detention Center | Building | 44 | Charles | 38 31 26 N | 076 59 04 W |
| Charles County Government Building | Building | 54 | Charles | 38 31 52 N | 076 58 52 W |
| Charles County Museum | Building | 4 | Charles | 38 30 39 N | 077 01 16 W |
| Charles County Public Library | Building | 53 | Charles | 38 31 49 N | 076 58 16 W |
| Charlestown Fire Company | Building | | Cecil | 39 57 35 N | 076 38 07 W |
| Charlestown Town Hall | Building | 7 | Cecil | 39 34 23 N | 075 58 34 W |
| Charlotte Robinson Hall | Building | | Prince George's | 39 00 59 N | 076 45 36 W |
| Chase Fire Department Station 54 | Building | | Baltimore | 39 21 41 N | 076 22 07 W |
| Chase-Lloyd House | Building | | Anne Arundel | 38 58 52 N | 076 29 20 W |
| Chauvenet Hall | Building | 4 | Anne Arundel | 38 58 58 N | 076 29 02 W |
| Cherry Hill Branch Enoch Pratt Free Library | Building | 34 | Baltimore (city) | 39 15 07 N | 076 37 46 W |
| Chesapeake Bay Maritime Museum | Building | 3 | Talbot | 38 47 15 N | 076 13 27 W |
| Chesapeake Beach Town Hall | Building | 0 | Calvert | 38 41 37 N | 076 32 03 W |
| Chesapeake City Town Hall | Building | 6 | Cecil | 39 31 38 N | 075 48 47 W |
| Chesapeake Dining Hall | Building | 584 | Allegany | 39 39 04 N | 078 56 09 W |
| Chesapeake Fire Museum | Building | 13 | Wicomico | 38 24 53 N | 075 40 34 W |
| Chesapeake Hall | Building | 9 | Wicomico | 38 20 52 N | 075 36 16 W |
| Chesapeake Railway Museum | Building | 3 | Calvert | 38 41 23 N | 076 32 02 W |
| Chester Hall | Building | 8 | Wicomico | 38 20 42 N | 075 36 30 W |
| Chestertown Police Department | Building | | Kent | 39 21 13 N | 076 07 16 W |
| Chestertown Town Hall | Building | 6 | Kent | 39 12 38 N | 076 03 56 W |
| Chestertown Volunteer Fire Company | Building | | Kent | 39 21 05 N | 076 06 41 W |
| Chestnut Ridge Volunteer Fire Company Station 50 | Building | | Baltimore | 39 27 13 N | 076 43 38 W |
| Cheverly Police Department | Building | | Prince George's | 39 32 49 N | 077 31 09 W |
| Chevey Chase Library | Building | 86 | Montgomery | 38 59 28 N | 077 04 36 W |
| Chevy Chase Fire Station Company 7 | Building | 87 | Montgomery | 38 59 26 N | 077 04 36 W |
| Chevy Chase Library | Building | 85 | Montgomery | 38 59 29 N | 077 04 36 W |
| Childrens Home of the Eastern Shore | Building | 9 | Talbot | 38 46 37 N | 076 04 14 W |
| Childrens Rehabilitation Institute (historical) | Building | 160 | Baltimore | 39 30 36 N | 076 42 39 W |
| Childrens Resource Center Library | Building | 112 | Montgomery | 39 03 15 N | 077 08 40 W |
| Childrens Village | Building | 154 | Baltimore | 39 27 39 N | 076 36 12 W |
| Chillum-Adelphi Volunteer Fire Department Company 34 | Building | | Prince George's | 39 38 45 N | 077 38 28 W |
| Choptank Hall | Building | 8 | Wicomico | 38 20 44 N | 075 36 29 W |
| Christian Community Center | Building | 7 | Baltimore (city) | 39 17 29 N | 076 36 02 W |
| Church Creek Volunteer Fire Company | Building | | Dorchester | 38 50 21 N | 076 15 26 W |
| Church Hill Volunteer Fire Company | Building | | Queen Anne's | 39 14 10 N | 076 39 04 W |
| Circle Theatre | Building | | Anne Arundel | 38 58 43 N | 076 29 23 W |
| Citizens Truck Company Number 4 | Building | | Frederick | 39 41 33 N | 077 41 26 W |
| City of Baltimore Fire Museum | Building | 9 | Baltimore (city) | 39 17 43 N | 076 36 20 W |
| 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 |
| Clara Barton House | Building | 42 | Montgomery | 38 58 01 N | 077 08 27 W |
| Clarksburg Community Center | Building | 167 | Montgomery | 39 13 32 N | 077 15 50 W |
| Clarksville Fire Station | Building | 149 | Howard | 39 12 28 N | 076 56 20 W |
| Clarksville Volunteer Fire Department Station 5 | Building | | Howard | 39 21 31 N | 077 34 08 W |
| Clear Spring Town Hall | Building | 177 | Washington | 39 39 24 N | 077 55 45 W |
| Clifton Branch Enoch Pratt Free Library | Building | 39 | Baltimore (city) | 39 18 47 N | 076 35 30 W |
| Clifton M Miller Library | Building | 15 | Kent | 39 12 58 N | 076 04 07 W |
| Clinton Volunteer Fire Department Company 25 | Building | | Prince George's | 39 16 58 N | 077 30 11 W |
| Cloisters Child Museum | Building | 148 | Baltimore | 39 24 37 N | 076 40 14 W |
| Coad Science Building | Building | 176 | Frederick | 39 40 56 N | 077 21 05 W |
| Coblentz Hall | Building | | Frederick | 39 42 39 N | 077 42 22 W |
| Coblentz Memorial Hall | Building | | Frederick | 39 42 32 N | 077 42 17 W |
| Cockeys Old Tavern (historical) | Building | 132 | Baltimore | 39 25 46 N | 076 40 13 W |
| Cockeysville Area Branch Baltimore County Public Library | Building | 130 | Baltimore | 39 27 37 N | 076 37 48 W |
| Cockeysville Volunteer Fire Company Station 39 | Building | | Baltimore | 39 29 31 N | 076 38 58 W |
| Coffman Chapel | Building | | Frederick | 39 42 26 N | 077 42 13 W |
| Cogan Student Union Building | Building | 178 | Frederick | 39 40 49 N | 077 21 07 W |
| Collamore Residence | Building | | Prince George's | 38 58 32 N | 076 51 44 W |
| College House | Building | | Frederick | 39 42 29 N | 077 42 17 W |
| College Park Branch Prince George's County Memorial Library | Building | 20 | Prince George's | 38 58 41 N | 076 56 08 W |
| Columbus Center For Marine Biology | Building | | Baltimore (city) | 39 17 11 N | 076 36 20 W |
| Commons Building | Building | 11 | Wicomico | 38 20 37 N | 075 36 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 |
| Community Volunteer Fire Department Millington | Building | | Kent | 39 26 04 N | 076 24 19 W |
| Compton Auditorium | Building | 598 | Allegany | 39 39 03 N | 078 55 54 W |
| Compton Science Center | Building | | Allegany | 39 39 04 N | 078 55 53 W |
| Conner House | Building | | Baltimore | 39 24 21 N | 076 35 31 W |
| Coppin Center | Building | | Baltimore (city) | 39 18 41 N | 076 39 28 W |
| Coppin Heights Development Center | Building | | Baltimore (city) | 39 18 33 N | 076 39 34 W |
| Corbin Memorial Library | Building | 3 | Somerset | 38 12 15 N | 075 42 34 W |
| Corriganville Volunteer Fire Company | Building | | Allegany | 40 09 40 N | 079 19 28 W |
| Corsica Hills Nursing Home | Building | 12 | Queen Anne's | 39 02 57 N | 076 03 39 W |
| Costen House Museum | Building | 3 | Worcester | 38 04 25 N | 075 33 60 W |
| Cottage City Colmar Manor Fire Company | Building | | Prince George's | 39 34 22 N | 077 36 14 W |
| Cottage City Police Department | Building | | Prince George's | 39 34 16 N | 077 35 12 W |
| Court Square Building | Building | 7 | Baltimore (city) | 39 17 29 N | 076 36 44 W |
| Cresaptown Volunteer Fire and Rescue | Building | | Allegany | 39 59 54 N | 079 23 06 W |
| Crofton Branch Library | Building | 24 | Anne Arundel | 39 00 54 N | 076 41 45 W |
| Crooke Emergency Communications Center | Building | 132 | Montgomery | 39 04 55 N | 077 09 03 W |
| Crumpton Seniors Center | Building | 10 | Queen Anne's | 39 14 14 N | 075 55 03 W |
| Crumpton Volunteer Fire Department | Building | | Queen Anne's | 39 24 30 N | 076 32 59 W |
| Cumberland City Hall | Building | 191 | Allegany | 39 39 10 N | 078 45 45 W |
| Cumberland City Police Department | Building | | Allegany | 40 05 35 N | 079 16 23 W |
| Cumberland Residence Hall | Building | 589 | Allegany | 39 39 08 N | 078 56 09 W |
| Cumberland Visitor Center | Building | 189 | Allegany | 39 39 02 N | 078 45 48 W |
| Dahlgren Hall | Building | 5 | Anne Arundel | 38 58 47 N | 076 29 03 W |
| Daley Hall | Building | | Baltimore (city) | 39 18 44 N | 076 39 26 W |
| Damascus Library | Building | 259 | Montgomery | 39 17 14 N | 077 12 01 W |
| Damascus Volunteer Fire Department Fire Station 13 | Building | | Montgomery | 39 29 27 N | 077 20 48 W |
| Dameron House | Building | 7 | St. Mary's | 38 09 43 N | 076 21 05 W |
| Darlington Family Reading Center | Building | 98 | Harford | 39 38 35 N | 076 12 14 W |