| 3542 Church Road | C | House |
| 3552 Church Road | C | Victorian House |
| 3560 Church Road | C | American Foursquare House |
| 3565 Church Road | C | Victorian House |
| 3574 Church Road | C | American Foursquare House |
| 3575 Church Road | C | House |
| 3585 Church Road | C | Carpenter Gothic Cottage |
| 3611 Church Road | C | HO-345 -- The Vineyard (Devine House) |
| 3655 Church Road | C | HO-60 -- Patapsco Female Institute, ruins (Patapsco Heights Hotel, Burg Alnwick Hotel, The Hilltop Theatre) |
| 3749 Church Road | C | HO-58 -- Angelo Castle (Angelo Cottage, Castle Angelo) |
| 3788 Church Road | C | HO-57 -- The Manse |
| 3791 Church Road | C | HO-56 -- Kenkins-Powell House (Jonathan Ellicott House, MacGill House) |
| 3799 Church Road | C | HO-55 -- Emory Methodist Church |
| 3802 Church Road | C | HO-436 -- Dr. Isaac J. Martin House (Kroh House) |
| 3829 Church Road | C | HO-61 -- The Firehouse Museum (Old Howard Co. Fire Department Building, Old Howard Co. Public Library) |
| 3421 Church Road (3421 Martha Bush Drive) | C | HO-193 -- Linwood (Linwood Children's Center) |
| Church Road & Sylvan Lane | C | HO-609 -- Church Road and Sylvan Lane Survey District |
| 3879 College Avenue | C | HO-355 -- Lilburn Cottage |
| 3899 College Avenue | C | HO-353 -- Lilburn Mansion (Balderstone's Mansion, Hazeldene) |
| 3899 College Avenue | C | HO-354 -- Lilburn Smokehouse |
| 8324 Court Avenue | C | HO-285 -- Weir House (Second School Building, Planning Office) |
| 8328 Court Avenue | C | HO-50 -- First Presbyterian Church (Howard County Historical Society Building) |
| 8343 Court Avenue | C | HO-437 -- Bright House, Lawyer's Row (Reuben Johnson House) |
| 8355 Court Avenue | C | HO-100 -- Bicentennial Headquarters Building |
| 8360 Court Avenue | C | HO-51 -- Howard County Courthouse |
| 3600 Fels Lane | C | HO-763 -- House |
| 3713 Fels Lane | C | HO-581 -- Fort-Heine House (Barnard or Bernard Fort House) |
| 3646 Fels Lane (House at 3640) | C | HO-979 -- William and Elizabeth Robinson House |
| 8469 Hill Street | C | HO-557 -- Mount Misery |
| 8448 Main Street | C | HO-315 -- George Burgess House |
| 8480 Main Street | C | HO-1135 -- Burgess House/Yates Grocery |
| Main Street (MD 144) | C | HO-332 -- Oliver Viaduct |
| Main Street (MD 144) | C | HO-591 -- National Pike Milestone No. 10 |
| 8000 Main Street (MD 144) | C | HO-72 -- Bridge Market (E.T. Clark Property, Radcliffe's Emporium, Louis T. Clark Grocery) |
| 8004-8024 Main Street (MD 144) | C | HO-70 -- Patapsco Hotel (Thomas' Patapsco Hotel, Stewart's Hotel, Wilson Patapsco Hotel, Ellicott City Times) |
| 8028-8036 Main Street (MD 144) | C | HO-86 -- Railroad Hotel (Turn Over a New Leaf, The Meeting House) |
| 8044-8046 Main Street (MD 144) | C | HO-62 -- The Town Hall (Opera House, Rhodey's Emporium) |
| 8048-8056 Main Street (MD 144) | C | HO-577 -- Hill, Robbins, Carter's 5 shops on Main Street |
| 8053 Main Street (MD 144) | C | HO-330 -- Phoenix Emporium (George Goeller Building, P. Valmas Building) |
| 8060 Main Street (MD 144) | C | HO-98 -- Lauman House (Alda Baptiste, Tongue Row Fabric Boutique) |
| 8066-8068 Main Street (MD 144) | C | HO-88 -- Cacao Lane Restaurant (Hunt's General Store, Millinery Shop, Edward Alexander House) |
| 8074-8082 Main Street (MD 144) | C | HO-89 -- Bernard Campbell House (Froogle Fashions, Import Specialties) |
| 8080 Main Street (MD 144) | C | |
| 8081 Main Street (MD 144) | C | HO-360 -- Boone House (Stone Shop) |
| 8086 Main Street (MD 144) | C | HO-97 -- John Williams' House (Pairo & Pairo Law Offices) |
| 8090 Main Street (MD 144) | C | HO-99 -- Margaret Smith Gallery (Norton's Drug Store) |
| 8098 Main Street (MD 144) | C | HO-52 -- Patapsco National Bank |
| 8109-8111 Main Street (MD 144) | C | HO-586 -- Katydid |
| 8113 Main Street (MD 144) | C | HO-359 -- Crosscurrents (Caplan's Frame Shop) |
| 8120 Main Street (MD 144) | C | HO-94 -- Samuel Powell House (Chateau Wine Supplies, Rhodey Beer Garden, Navicki's (Votta's) Shoe Repair) |
| 8126-8132 Main Street (MD 144) | C | HO-79 -- I.O.O.F. Lodge Building (Annie's) |
| 8129 Main Street (MD 144) | C | HO-357 -- Stillridge Herb Shop (Caplan's Stone Shop) |
| 8133 Main Street (MD 144) | C | HO-358 -- Mumbles and Squeaks (Fissel's Stone Shop) |
| 8180-8182 Main Street (MD 144) | C | HO-69 -- Walker-Chandler House, Mrs. Rowland Bounds' House (Ellicott Country Store) |
| 8186-8192 Main Street (MD 144) | C | HO-90 -- Charlotte Tazewell House (Lena McCauley Brick House) |
| 8198 Main Street (MD 144) | C | HO-53 -- Samuel Powell House |
| 8202 Main Street (MD 144) | C | HO-68 -- Howard House |
| 8267 Main Street (MD 144) | C | HO-752 -- Ellicott City Post Office |
| 8289 Main Street (MD 144) | C | HO-1102 -- Ellicott City Garage (Reedy Electric) |
| 8298-8304 Main Street (MD 144) | C | HO-82 -- Disney's Tavern, H.H. Tamburo Shop (Mount Misery, Fabric House, Sprecher House) |
| 8308 Main Street (MD 144) | C | HO-341 -- Talbott Lumber Company (Ellicott Mills Brewing Company) |
| 8329-8333 Main Street (MD 144) | C | HO-325 -- Caleb Merryman's Two Frame Buildings (Abend House, Kirkwood's Double House) |
| 8345 Main Street (MD 144) | C | HO-362 -- Ida Holzweig's Double Stone House #2 (State Farm & Antiques Etc.) |
| 8357 Main Street (MD 144) | C | HO-361 -- Ida Holzweig's Double Stone House #1 (Brown Law Office) |
| 8385 Main Street (MD 144) | C | HO-573 -- The Judge's Bench (Buzz Suter Building) |
| 8394 Main Street (MD 144) | C | HO-64 -- Thomas Isaac's Log Cabin (Stanton's Log Cabin) |
| 8398 Main Street (MD 144) | C | HO-340 -- Old Howard County Courthouse |
| 8450 Main Street (MD 144) | C | HO-583 -- Samuel Burgess Carriage House |
| 8454 Main Street (MD 144) | C | HO-338 -- Sam Caplan House (Burgess Tenant House, Miller's House) |
| 8490 Main Street (MD 144) | C | |
| 8516 Main Street (MD 144) | C | HO-483 -- S.E. Yates House |
| 8532-8534 Main Street (MD 144) | C | HO-336 -- William Moore House |
| 8572 Main Street (MD 144) | C | HO-482 -- Catherine Kuhn House |
| 8624 Main Street (MD 144) | C | HO-334 -- George White Shop |
| 8340 Main Street (MD144) (formerly 8398 Court Avenue) | C | HO-343 -- Curran-Boerly House (The History Shoppe) |
| 2711 Maryland Avenue | C | HO-71 -- Ellicott City B&O Railroad Station, Freight Building, & Turntable |
| 3709 Old Columbia Pike | C | HO-1133 -- Fahey House and Shop |
| 3774 Old Columbia Pike (MD 144) | C | HO-308 -- Manelli Cottage |
| 3782 Old Columbia Pike (MD 144) | C | HO-550 -- Latimer House |
| 3771 Old Columbia Pike (MD 987) | C | HO-67 -- Friends Meeting House (Quaker Meeting House) |
| 3771 Old Columbia Pike (MD 987) | C | HO-66 -- Quaker Burial Grounds |
| 3771 Old Columbia Pike (MD 987) | C | HO-65 -- Ellicott Family Burial Grounds |
| 3786-3790 Old Columbia Pike (MD 987) | C | HO-307 -- David Myer's House |
| 3801-3803 Old Columbia Pike (MD 987) | C | HO-305 -- Esther Rettger's Two-Part House |
| 3815 Old Columbia Pike (MD 987) | C | HO-303 -- Bruce Smyser's Double House |
| 3817 Old Columbia Pike (MD 987) | C | HO-363 -- Charles Ringly House #2 |
| 3820 Old Columbia Pike (MD 987) | C | HO-302 -- Charles Ringley's House |
| 3821 Old Columbia Pike (MD 987) | C | HO-304 -- Paul Perkins House |
| 3825 Old Columbia Pike (MD 987) | C | HO-301 -- Tuten's Cottage, site |
| 3829 Old Columbia Pike (MD 987) | C | HO-300 -- Broxton |
| 3832 Old Columbia Pike (MD 987) | C | HO-558 -- Prestage's Folly |
| 3709 Park Avenue (Formerly 1 Emory Streety) | C | HO-54 -- Howard County Jail |
| 3691 Sarah's Lane | C | HO-59 -- Mount Ida |
| 8205 St. Paul Place | C | HO-298 -- St. Peters Rectory & Parish House |
| St. Paul Street | C | HO-76 -- St. Paul's Catholic School (Patapsco National Bank) |
| 3744 St. Paul Street | C | HO-493 -- Sydney C. Robertson House |
| 3749 St. Paul Street | C | HO-348 -- St. Paul's Roman Catholic Church |
| 3755 St. Paul Street | C | HO-347 -- St. Paul's Church Rectory |
| 3760-3766 St. Paul Street | C | HO-350 -- Sam Caplan Double Houses |
| 3768-3776 St. Paul Street | C | HO-346 -- John Baker Five Houses |
| 3420 Sylvan Lane | C | Victorian House |
| 3541 Sylvan Lane | C | Frame House |
| 3570 Sylvan Lane | C | Victorian House |
| 3578 Sylvan Lane | C | Victorian House |
| 3581 Sylvan Lane | C | Frame House |
| 3621 Sylvan Lane | C | |
| 3641 Sylvan Lane | C | Frame House |
| 8069 Tiber Alley | C | HO-83 -- Collier's Grist Mill (Bernard Fort CM, Ellicott City Mills, E.C. Electric Light and Power Co.) |
| Tiber Alley over Tiber River | C | HO-669 -- Bridge (SHA HO-107) |
| 3732 Tongue Row | C | HO-312 -- Hi Ho Silver (Wexford House Shop) |
| 3736-3742 Tongue Row | C | HO-311 -- R&R Unlimited Antiques |
| 3744-3748 Tongue Row | C | HO-310 -- Rebel Trading Post & The Arms Room (Ijams Shop) |
| 3752-3754 Tongue Row | C | HO-309 -- Esther Rettger's Shop (Pieter Meerschaert's Shop) |
| 3723 Tongue Row (3723 Old Columbia Pike) | C | HO-313 -- George Anderson Shop (Day-O'Neal-French House) |
| Church Road | NC | |
| 3431 Church Road | NC | Cottage |
| 3496 Church Road | NC | House |
| 3538 Church Road | NC | HO-1127 -- John and Hattie Groener House |
| 3542 Church Road | NC | House |
| 3557 Church Road | NC | House |
| 8390 Church Road | NC | Tenant House |
| Court Avenue | NC | Office Building |
| Ellicott Mills Drive | NC | Apartments |
| Junction of Columbia Pike and Main Street | NC | Movie House |
| Old Columbia Pike over Tiber River | NC | HO-680 -- Bridge No. HO-132 (Old Columbia Pike over Tiber River) |
| 8396? Park Drive | NC | Cottage |
| 8380 Park Road | NC | House |
| 3530 Sylvan Lane | NC | House |
| 3649 Sylvan Lane | NC | Aluminum-sided House |
| Sylvan Lane over tributary of Sucker Branch | NC | HO-741 -- Bridge (SHA HO-111) |
| Circuit Court Building | | HO-637 -- Confederate Monument |
| 3675 College Avenue | | HO-1003 -- Joseph and Virgile McAllister House, site |
| 3700 College Avenue | | HO-590 -- Rock Hill College (Rock Hill Academy) |
| 8360 Court Place | | HO-284 -- Oak Lawn (Hayden House, former Board of Ed. Building) |
| 3637 Fels Lane | | HO-1131 -- Ezra and Ann Fell House |
| 8197 Main Street | | HO-1132 -- Taylor's Furniture Store |
| 8472-8478 Main Street | | HO-1136 -- Yates Apartment |
| 8505-8507 Main Street | | HO-1002 -- Somerville Double Tenant House |
| 8137 Main Street (MD 144) | | HO-1008 -- Washington Trust Company (Commercials & Farmers Bank; Farmers & Mechanics Bank) |
| 8390 Main Street (MD 144) | | HO-984 -- Third Ellicott City Firehouse |
| 8454 Main Street (MD 144) | | HO-339 -- Sam Caplan's Cottage, site |
| 3793 Mulligan Hill Lane | | HO-333 -- Ellicott Cottage Lots 3 and 4 (Dennis Mulligan's Two Brick Houses, Mulligan's Brick Duplex House) |
| 3988 Mulligan's Hill Lane | | HO-1120 -- Mulligan's Frame Duplex Houses (Mulligan's Hill Frame Duplex Houses) |
| 3816 New Cut Road | | HO-352 -- Butke's Log House, site |
| 3711 Old Columbia Pike | | HO-1134 -- Ridgely Building |
| 3779 Old Columbia Pike | | HO-78-1 -- Angevina Cottage |
| Old Columbia Pike (MD 987) | | HO-306 -- Friends Meeting House Historic Marker |
| St. Paul Place | | HO-351 -- Old St. Peter's Church Rectory, site |
| St. Paul Place | | HO-299 -- St. Peters Episcopal Church, site |
| Sylvan Lane | | HO-732 -- Mentzel Paper Company Site |
| 3405 Sylvan Lane | | Frame Cottage |
| 3531 Sylvan Lane | | Frame House |
| 3645 Sylvan Lane | | Frame Cottage |