Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Winding Ridge | Locale | 746 | Garrett | 39 41 17 N | 079 19 32 W |
| Winding Ridge | Ridge | 774 | Garrett | 39 41 17 N | 079 20 04 W |
| WKHJ-FM (Mountain Lake Park) | Tower | 938 | Garrett | 39 24 37 N | 079 17 14 W |
| WMSG-AM (Oakland) | Tower | 747 | Garrett | 39 25 15 N | 079 24 59 W |
| Wolf Gap | Gap | 826 | Garrett | 39 41 54 N | 078 56 16 W |
| Wolf Swamp | Swamp | 788 | Garrett | 39 40 09 N | 079 05 11 W |
| Wolfden Run | Stream | | Garrett | 39 23 20 N | 079 11 39 W |
| Wonderly Cemetery | Cemetery | 759 | Garrett | 39 22 36 N | 079 22 08 W |
| Yoder School | School | 715 | Garrett | 39 42 47 N | 079 08 57 W |
| Zehner Hill | Summit | 908 | Garrett | 39 42 56 N | 079 12 17 W |
| Zion Evangelical Lutheran Church | Church | 733 | Garrett | 39 37 51 N | 079 19 05 W |
| A B Demarco Memorial Park | Park | 65 | Harford | 39 31 25 N | 076 10 37 W |
| Abbey Creek | Stream | | Harford | 39 21 09 N | 076 14 01 W |
| Abbey Point | Cape | 3 | Harford | 39 20 58 N | 076 13 40 W |
| Aberdeen | Populated Place | 29 | Harford | 39 30 34 N | 076 09 51 W |
| Aberdeen Branch Harford County Library | Building | 28 | Harford | 39 30 45 N | 076 09 50 W |
| Aberdeen Festival Park | Park | 29 | Harford | 39 30 41 N | 076 09 49 W |
| Aberdeen Fire Department Company 2 House 1 | Building | | Harford | 39 51 22 N | 076 16 53 W |
| Aberdeen Fire Department Company 2 House 2 | Building | | Harford | 39 51 03 N | 076 16 13 W |
| Aberdeen Fire Department Company 2 House 3 | Building | | Harford | 39 52 21 N | 076 17 24 W |
| Aberdeen High School | School | 49 | Harford | 39 30 58 N | 076 10 17 W |
| Aberdeen Hills (subdivision) | Populated Place | 61 | Harford | 39 31 33 N | 076 10 37 W |
| Aberdeen Industrial Center | Locale | 18 | Harford | 39 29 22 N | 076 10 48 W |
| Aberdeen Market Place Shopping Center | Locale | 60 | Harford | 39 31 18 N | 076 10 54 W |
| Aberdeen Middle School | School | 39 | Harford | 39 30 54 N | 076 09 53 W |
| Aberdeen Police Department | Building | | Harford | 39 51 16 N | 076 16 45 W |
| Aberdeen Post Office | Post Office | 31 | Harford | 39 30 34 N | 076 09 55 W |
| Aberdeen Proving Ground Post Office | Post Office | 13 | Harford | 39 28 56 N | 076 07 49 W |
| Aberdeen Swim Club | Locale | 49 | Harford | 39 32 10 N | 076 09 57 W |
| Abingdon | Populated Place | 51 | Harford | 39 27 44 N | 076 16 45 W |
| Abingdon Elementary School | School | 62 | Harford | 39 28 40 N | 076 19 31 W |
| Abingdon Fire Company | Building | | Harford | 39 47 30 N | 076 29 29 W |
| Abingdon Landfill | Locale | 25 | Harford | 39 27 10 N | 076 16 58 W |
| Abingdon Post Office | Post Office | 71 | Harford | 39 28 40 N | 076 18 35 W |
| Abingdon Reserve | Populated Place | 55 | Harford | 39 27 57 N | 076 16 59 W |
| Adams Heights | Populated Place | 89 | Harford | 39 32 16 N | 076 10 49 W |
| Adams Mobile Home Park | Populated Place | 18 | Harford | 39 31 47 N | 076 07 34 W |
| Advocate Hill Farms | Populated Place | 189 | Harford | 39 35 58 N | 076 27 40 W |
| Ady | Populated Place | 145 | Harford | 39 38 19 N | 076 19 58 W |
| Ady Estates | Populated Place | 121 | Harford | 39 40 04 N | 076 21 14 W |
| Aldino | Populated Place | 128 | Harford | 39 33 50 N | 076 11 45 W |
| Allendale Estates | Populated Place | 78 | Harford | 39 34 52 N | 076 15 08 W |
| Allibone (historical) | Populated Place | 64 | Harford | 39 36 58 N | 076 18 52 W |
| Alton Homes (subdivision) | Populated Place | 54 | Harford | 39 31 09 N | 076 10 54 W |
| Ames Church | Church | 118 | Harford | 39 31 59 N | 076 20 54 W |
| Ames Plaza Shopping Center | Locale | 25 | Harford | 39 31 43 N | 076 07 52 W |
| Ames Shopping Center | Locale | 12 | Harford | 39 26 11 N | 076 18 59 W |
| Amos Island (historical) | Island | 30 | Harford | 39 39 59 N | 076 11 12 W |
| Amos Mill | Populated Place | 180 | Harford | 39 42 01 N | 076 30 04 W |
| Amoss | Populated Place | 140 | Harford | 39 31 41 N | 076 24 37 W |
| Amyclae Estates | Populated Place | 104 | Harford | 39 32 59 N | 076 19 19 W |
| Angel Hill Cemetery | Cemetery | 29 | Harford | 39 33 19 N | 076 06 11 W |
| Annes Delight | Populated Place | 31 | Harford | 39 25 37 N | 076 20 50 W |
| Appleview Farms | Locale | 131 | Harford | 39 43 05 N | 076 17 37 W |
| Aquila Scott Park | Park | 87 | Harford | 39 32 11 N | 076 19 44 W |
| Asbury Cemetery | Cemetery | 124 | Harford | 39 33 02 N | 076 16 06 W |
| Asbury Church | Church | 125 | Harford | 39 33 01 N | 076 16 06 W |
| Ascension Cemetery | Cemetery | 134 | Harford | 39 38 48 N | 076 17 33 W |
| Ashby Place | Populated Place | 32 | Harford | 39 25 31 N | 076 18 51 W |
| Atkisson Dam | Dam | 30 | Harford | 39 28 36 N | 076 20 21 W |
| Atkisson Reservoir | Reservoir | 30 | Harford | 39 28 36 N | 076 20 21 W |
| Ayers Chapel | Church | 178 | Harford | 39 39 53 N | 076 32 33 W |
| B and J Trailer Park | Populated Place | 19 | Harford | 39 31 05 N | 076 08 45 W |
| Back Creek | Stream | | Harford | 39 23 18 N | 076 12 11 W |
| Back Creek | Stream | | Harford | 39 26 38 N | 076 05 14 W |
| Bagley | Populated Place | 141 | Harford | 39 29 54 N | 076 23 52 W |
| Bagleys Venture | Populated Place | 136 | Harford | 39 29 47 N | 076 23 42 W |
| Baker Cemetery | Cemetery | 102 | Harford | 39 31 52 N | 076 11 59 W |
| Bakerfield Elementary School | School | 40 | Harford | 39 30 47 N | 076 10 15 W |
| Bakersfield | Populated Place | 187 | Harford | 39 33 47 N | 076 29 19 W |
| Bald Hill | Populated Place | 97 | Harford | 39 41 09 N | 076 13 43 W |
| Baldwin Hills | Populated Place | 177 | Harford | 39 34 00 N | 076 27 48 W |
| Baldwin Manor (subdivision) | Populated Place | 24 | Harford | 39 30 35 N | 076 09 34 W |
| Bar Harbor Campground | Locale | 0 | Harford | 39 27 42 N | 076 14 44 W |
| Bar Kess Heights (subdivision) | Populated Place | 39 | Harford | 39 31 14 N | 076 09 29 W |
| Barren Point | Cape | 0 | Harford | 39 22 17 N | 076 16 37 W |
| Battery Island | Island | 0 | Harford | 39 29 40 N | 076 04 59 W |
| Bauers Mobile Home Park | Populated Place | 12 | Harford | 39 25 35 N | 076 16 54 W |
| Bay City Market Shopping Center | Locale | 8 | Harford | 39 32 51 N | 076 05 16 W |
| Bay Ridge | Populated Place | 139 | Harford | 39 41 43 N | 076 20 12 W |
| Bay View Mobile Home Park | Populated Place | 5 | Harford | 39 26 41 N | 076 17 03 W |
| Bayside Village | Populated Place | 18 | Harford | 39 29 45 N | 076 08 33 W |
| Bayview Estates (subdivision) | Populated Place | 69 | Harford | 39 33 07 N | 076 06 56 W |
| Beach Point | Cape | -3 | Harford | 39 23 17 N | 076 16 08 W |
| Bear Cabin Branch | Stream | | Harford | 39 32 10 N | 076 23 41 W |
| Bear Point | Cape | 0 | Harford | 39 26 13 N | 076 04 54 W |
| Beards Hill Plaza Shopping Center | Locale | 60 | Harford | 39 31 25 N | 076 10 55 W |
| Beckley Estates | Populated Place | 188 | Harford | 39 35 52 N | 076 32 19 W |
| Beechwood Mobile Home Park | Populated Place | 8 | Harford | 39 27 49 N | 076 15 37 W |
| Bel Air | Populated Place | 126 | Harford | 39 32 09 N | 076 20 54 W |
| Bel Air Acres | Populated Place | 83 | Harford | 39 31 10 N | 076 22 04 W |
| Bel Air Armory | Building | 120 | Harford | 39 32 17 N | 076 20 59 W |
| Bel Air Branch Harford County Library | Building | 122 | Harford | 39 32 17 N | 076 21 04 W |
| Bel Air Church of the Nazarene | Church | 154 | Harford | 39 34 20 N | 076 21 13 W |
| Bel Air Commercial Park | Locale | 118 | Harford | 39 31 20 N | 076 21 39 W |
| Bel Air Convalescent Center | Hospital | 114 | Harford | 39 31 45 N | 076 20 08 W |
| Bel Air Courthouse Historic District | Park | 118 | Harford | 39 32 10 N | 076 21 56 W |
| Bel Air Elementary School | School | 121 | Harford | 39 32 23 N | 076 21 02 W |
| Bel Air High School | School | 114 | Harford | 39 31 47 N | 076 20 49 W |
| Bel Air Medical Center | Hospital | 110 | Harford | 39 31 47 N | 076 20 03 W |
| Bel Air Memorial Gardens | Cemetery | 131 | Harford | 39 32 50 N | 076 21 30 W |
| Bel Air Middle School | School | 111 | Harford | 39 31 38 N | 076 20 41 W |
| Bel Air Park | Park | 103 | Harford | 39 32 12 N | 076 20 18 W |
| Bel Air Plaza Shopping Center | Locale | 106 | Harford | 39 31 36 N | 076 21 06 W |
| Bel Air Police Department | Building | | Harford | 39 54 25 N | 076 35 24 W |
| Bel Air Post Office | Post Office | 122 | Harford | 39 32 19 N | 076 21 09 W |
| Bel Air Reservoir | Reservoir | 152 | Harford | 39 34 26 N | 076 22 58 W |
| Bel Air Town Shopping Center | Locale | 112 | Harford | 39 31 40 N | 076 21 15 W |
| Bel Air United Methodist Church | Church | 126 | Harford | 39 32 13 N | 076 21 02 W |
| Bel Air Volunteer Fire Company | Building | | Harford | 39 54 04 N | 076 35 10 W |