This is a list of the Maryland state historical markers in Harford County.

This is intended to be a complete list of the official state historical markers placed in Harford County, Maryland by the Maryland Historical Trust (MHT). The locations of the historical markers, as well as the latitude and longitude coordinates as provided by the MHT's database, are included below. There are currently 51 historical markers located in Harford County.

Marker titleImageCityLocationTopicsAberdeen Proving GroundAberdeen, MarylandUS 40 (median), west of MD 132Bel Air - County Seat of Harford CountyBel Air, MarylandMain Street at Office Street and Courtland StreetBerkley CrossroadsDarlington, Maryland2398 Castleton Rod (MD 263) southbound, N of Berkley Rd.Black Horse TavernBlackhorse, MarylandMD 23 (southbound) at MD 138Calvary United Methodist ChurchChurchville, MarylandMD 136 (northbound), 1321 Calvary RoadCapt. Angus GremeChurchville, MarylandMD 136 (southbound) at Trappe RoadCaptain John SmithAbingdon, MarylandUS 40 (eastbound) west of Otter Point Road, in park overlooking Otter Point CreekChurchvilleChurchville, MarylandMD 22 at MD 136, northeast cornerColony of MarylandAberdeen, MarylandI-95, Maryland House Rest StopConcord Point Light StationHavre de Grace, MarylandConcord and Lafayette StreetsConowingoConowingo, MarylandUS 1 (southbound), 0.25 mile south of damConstant FriendshipAbingdon, MarylandNorthbound MD 928, N of Porter Dr.ENIACAberdeen, MarylandMD 22 between MD 7 and gate to Aberdeen Proving GroundGeorge Washington Traveled This RoadHavre de Grace, MarylandSt. John Street at Green StreetGeorge Washington Traveled This RoadHavre de Grace, MarylandUnion Avenue at Franklin Street, southwest cornerGeorge Washington Traveled This RoadHavre de Grace, MarylandUnion Avenue at Revolution, north of northwest cornerHall's Cross RoadsAberdeen, MarylandMD 132 at E. Bel Air Avenue, southeast cornerHarford Town or BushBush, MarylandMD 7 (westbound) at Bush Road, just west of bridge over Bynum RunHarry Gilmor's RaidStockton, MarylandMD 152 (southbound) at Old Joppa RoadHavre de Grace RacetrackHavre de Grace, MarylandMD 7 (Old Post Road/ Revolution Street) at Old Bay LaneHavre de Grace War of 1812Havre de Grace, MarylandLafayette Street at Concord Street (in park)Indian SpringChurchville, MarylandMD 136 (east side), 2.0 miles south of MD 1Jerusalem MillsJerusalem, MarylandJerusalem Road at Little Gunpowder BridgeJoppa TownJoppatowne, MarylandBridge Drive and Anchor DriveLadew Topiary Gardens and Pleasant Valley HouseJarrettsville, MarylandMD 146 (northbound), 0.8 mile south of MD 152, north of Pocock RoadLaFayette - at Col. Rigbie's HouseDarlington vicinity, MarylandMD 623 (Castleton Road), approximately 1500 feet south of Berkley RoadMedical HallChurchville, MarylandNorthwest corner of MD Route 22 and Thomas Run RoadOld Post Road Established 1666 - Cokesbury CollegeAbingdon, MarylandMD 7 (eastbound) at Cokesbury RoadOld Post Road Established 1666 - Count Rochambeau'sHavre de Grace, MarylandLewis Lane (northbound), north of MD 7Old Post Road Established 1666 - Gov. William PacaEdgewood, MarylandMD 7 (northbound), north of MD 24Old Post Road Established 1666 - Spesutia P.E. ChurchAberdeen, MarylandMD 7 (Old Philadelphia Road) at MD 159 (Perryman Road)Old Post Road Established 1666 - Susquehanna Lower FerryHavre de Grace, MarylandSt. John Street at Warren StreetOlneyJoppa, MarylandOld Joppa Road (eastbound), east of MD 152Peach Bottom Slate RegionWhiteford, Marylandon MD 165 north of MD 136Prospect SchoolHavre de Grace, MarylandMD 161 at Green Spring Rd.Rochambeau PlazaHavre de Grace, MarylandWashington Street at St. John Street and Green StreetRock RunRock Run, MarylandRock Run Road, 100 yds west of Stafford Road, Rock Run State ParkRock Run LandingHavre de Grace, MarylandRock Run Road at Stafford RoadSaint Ignatius Church Hickory, MarylandBel Air, MarylandUS 1 Business, south of Jarrettsville RoadSite of "Old Baltimore", MarylandHead of Bush River on US 40Site of Old BaltimoreAbingdon, MarylandUS 40 (eastbound) in park overlooking Otter Point Creek, west of Otter Point RoadSophia's DairyBelcamp, MarylandUS 40 (southbound), north of MD 543 (Riverside Pkway)Spesutia ChurchPerryman, MarylandMD 159 (southbound), south of Spesutia RoadSpesutia IslandAberdeen, MarylandSpesutia Road at Woodpecker Point (at small roadside park)State of MarylandAberdeen, MarylandI-95, Maryland House Rest StopSusquehanna River CrossingHavre de Grace, MarylandMD 7/N. Union Ave., south of Otsego St., at David R. Craig ParkThe Bush Declaration Harford TownBush, MarylandMD 7 (westbound), east of Bush RoadThe General's HighwayAberdeen, MarylandNE corner of US Rte 40 (Pulaski Hwy) and W. Belair Ave.The Hays HouseBel Air, Maryland324 Kenmore AvenueThe Lock HouseHavre de Grace, MarylandPark Drive at Conesteo StreetTudor HallBel Air, MarylandMD 22 (southbound) at Tudor Lane

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