| 11 Courtland Street | C | 1930s Brick Building |
| 17 Courtland Street | C | HA-219 -- Archer Building |
| 21 Courtland Street | C | HA-1391 -- Baltimore Gas & Electric Building (Harford Democrat Building) |
| 25-27 Courtland Street | C | HA-1392 -- Holden Building |
| 29 Courtland Street | C | HA-1393 -- Aegis Building |
| 31 Courtland Street | C | HA-1394 -- Mrs. Dunnigan Building (Ranneberger Building) |
| 33 Courtland Street | C | HA-1395 -- Mrs. Dunnigan Hotel & Restaurant (County Extension Office) |
| Courtland Street & Bond Street | C | HA-1396 -- Survey Stone #2 |
| 34 S. Main Street (MD 924) | C | HA-1451 -- Herman's Store |
| 100 S. Main Street (MD 924) | C | HA-1452 -- Stagmer's Hotel |
| 6-8 Office Street | C | HA-1461 -- Preston Gilbert Law Office |
| 12 Office Street | C | HA-1462 -- First National Bank Building (Second National Bank Building) |
| 14 Office Street | C | HA-1462 -- Reed Building |
| 18 Office Street | C | HA-1463 -- Harford Mutual Fire Insurance Co. Building (County Office Building) |
| 20 Office Street | C | HA-1464 -- Lee Building |
| 26 Office Street | C | HA-1464 -- Farmers and Merchant's Bank Building (Johnson Credit Company) |
| 28 Office Street | C | HA-1465 -- Robinson Building |
| 30 Office Street | C | HA-282 -- Cameron & Reed Offices |
| Office Street & Bond Street | C | HA-1466 -- Survey Stone #1 |
| 4 Office Street | NC | Brick Building |
| S. Main Street (MD 924) & Courtland Street | C/NC | HA-218 -- Harford County Courthouse |
| Bond Street | | HA-1242 -- Old Masonic Lodge |
| Bond Street | | HA-1243 -- Harford National Bank (County Office Building) |