List of Howard County properties in the Maryland Historical Trust
The Maryland Historical Trust serves as the central historic preservation office in Maryland. The properties listed reside within the boundaries of modern Howard County. Prior to 1851, sites would have been part of Anne Arundel County. Sites settled prior to 1650 would have been part of St Mary's County in the Province of Maryland which was settled in 1632 by Europeans.
Maryland Historical Trust properties in Howard County
- HO-1, Cherry Grove, 2937 Jennings Chapel Road, Woodbine
- HO-2, Oakdale, 16449 Edwin Warfield Road, Woodbine
- HO-3, Pleasant Valley, 13893 Forsythe Road, Cooksville
- HO-4, Red House Tavern, Hoods Mill Road, Cooksville
- HO-5, Roberts Inn, 14610 Frederick Road, Cooksville
- HO-6, Ellerslie, 2761 Roxbury Mills Road, Cooksville
- HO-7, Union Chapel, Roxbury Mills Road, Glenwood
- HO-8, Longwood, 3188 Roxbury Mills Road, Glenwood
- HO-9, Round About Hills, 15505 Cattail Oaks, Glenwood
- HO-10,Villa de Speranza, 3890 Roxbury Mills Road, Glenwood
- HO-11, Duvall's Range, 15451 Roxbury Road, Glenwood
- HO-12, Roxbury Mill, Roxbury Mill Road, Brookeville
- HO-13, Howard Lodge, 12301 Howard Lodge Drive, Sykesville
- HO-14, Howard County Hunt Club, 13402 Triadelphia Road, Ellicott City
- HO-15, Glenelg Manor, 12793 Folly Quarter Road, Glenelg
- HO-16, Folly Quarter Manor, 12290 Folly Quarter Road, Ellicott City
- HO-17, Folly Quarter Farm, 4308 Folly Quarter Road, Ellicott City
- HO-18, Walnut Grove, 5192 Sheppard Lane, Clarksville
- HO-19, Huntington Farms, 13180 Brighton Dam Road, Clarksville
- HO-20, Hickory Ridge, 13032 Highland Road, Clarksville
- HO-21, Waverley, 2335 Waverly Mansion Drive, Marriotsville
- HO-22, Doughoregan Manor, 3500 Old Manor Lane, Ellicott City
- HO-23, Burleigh Manor and Gate House, 3950 White Rose Way, Ellicott City
- HO-24, Font Hill, 3838 Parrot Drive, Ellicott City
- HO-25, Brick House on the Pike, 9564 National Pike, Ellicott City
- HO-26, St. John's Episcopal Church, 9130 Frederick Road, Ellicott City
- HO-27, Daniels Mill, Daniels Road, Ellicott
- HO-28, Dorsey Hall, 5100 Dorsey Hall Drive, Ellicott City
- HO-29, Arlington, 5100 Columbia Road, Columbia
- HO-30, Woodlawn, Bendix Road Also 4614 New Cut Road, Ellicott City
- HO-32, Oakland Manor, 5430 Vantage Point Road, Columbia Maryland
- HO-33, Blandair, 6651 Little Patuxent Parkway, Columbia
- HO-34, Waveland, Sewells Orchard Drive, Columbia
- HO-35, Christ Church, 6800 Oakland Mills Road, Columbia
- HO-36, Oak Hall Site, Oak Hall Lane, Columbia
- HO-37, Athol, 6680 Columbia Pike, Columbia
- HO-38, Montpelier, 10904 Johns Hopkins Road, Laurel
- HO-39, Worthington's Quarters, Weather Worn Way, Columbia
- HO-40, Moundland, Guilford Road, Columbia
- HO-41, Commodore Joshua Barney House, 7912 Savage Guilford Road, Jessup
- HO-42, Savage Mill Historic District, Savage
- HO-43, Belmont, 6555 Belmont Woods Road, Elkridge
- HO-44, Troy Hill, Baltimore Washington Boulevard, Elkridge
- HO-45, Trinity Church, 7474 Baltimore Washington Boulevard, Elkridge
- HO-46, Spurriers Tavern, site, Waterloo Road & Baltimore Washington Boulebard, Jessup
- HO-47, Temora, 4252 Columbia Road, Ellicott City
- HO-48, Woodlawn, 8880 Frederick Road, Ellicott City
- HO-49, Mount Hebron, 2331 Calvin Circle, Ellicott City
- HO-50, First Presbyterian Church, 8328 Court Avenue, Ellicott City
- HO-51, Howard County Courthouse, 8360 Court Avenue, Ellicott City
- HO-52, Patapsco National Bank, 8098 Main Street, Ellicott City
- HO-53, Samuel Powell House, 8198 Main Street, Ellicott City
- HO-54, Howard County Jail, 3709 Park Avenue, Ellicott City
- HO-55, Emory Methodist Church, 3799 Church Road, Ellicott City
- HO-56, Jenkins-Powell House, 3791 Church Road, Ellicott City
- HO-57, The Manse, 3788 Church Road, Ellicott City
- HO-58, Angelo Castle, 3749 Church Road, Ellicott City
- HO-59, Mount Ida, 3691 Sarah's Lane, Ellicott City
- HO-60, Patapsco Female Institute, 3655 Church Road, Ellicott City
- HO-61, The Firehouse Museum, 3829 Church Road, Ellicott City
- HO-62, The Town Hall, 8044-8046 Main Street, Ellicott City
- HO-63, Patterson Viaduct, Ilchester Road & River Road, Catonsville
- HO-64, Thomas Isaac's Log Cabin, Main Street & Ellicott Mills Drive, Ellicott City
- HO-65, Ellicott Family Burial Grounds, Old Columbia Pike, Ellicott City
- HO-66, Quaker Burial Grounds, Old Columbia Pike, Ellicott City
- HO-67, Friends Meeting House, 3771 Old Columbia Pike, Ellicott City
- HO-68, Howard House, 8202 Main Street, Ellicott City
- HO-69, Walker-Chandler House, Mrs. Rowland Bounds' House, 8180 Main Street, Ellicott City
- HO-70, Patapsco Hotel, Ellicott City
- HO-71, Ellicott City B&O Railroad Station, Freight Building, & Turntable, 2711 Maryland Avenue, Ellicott City
- HO-72, Bridge Market, 8000 Main Street, Ellicott City
- HO-73, Ellicott Mill Original Historic Site, Frederick Road, Ellicott City
- HO-74, BLANK
- HO-75, BLANK
- HO-76, St. Paul's Catholic School, St. Paul Street, Ellicott City
- HO-77, BLANK
- HO-78, Ellicott City Historic District, Ellicott City
- HO-79, I.O.O.F. Lodge Building, 8126-8132 Main Street, Ellicott City
- HO-80, Thomas Viaduct, Baltimore & Ohio Railway, B&O Railroad over Patapsco River, Halethorpe
- HO-81, Bollman Suspension Truss Bridge, Savage Road, Savage
- HO-82, Disney's Tavern, H.H. Tamburo Shop, 8298-8304 Main Street, Ellicott City
- HO-83, Collier's Grist Mill, 8069 Tiber Alley, Ellicott City
- HO-84, Linden Grove, 5790 Tamar Drive, Columbia
- HO-85, Montrose Farm, 13370 Brighton Dam Road, Clarksville
- HO-86, Railroad Hotel, 8028-8046 Main Street, Ellicott City
- HO-87, Bethesda, 9140 Sybert Drive, Ellicott City
- HO-88, Cacao Lane Restaurant, 8066-8068 Main Street, Ellicott City
- HO-89, Bernard Campbell House, 8074-8082 Main Street, Ellicott City
- HO-90, Charlotte Tazewell House, 8192 Main Street, Ellicott City
- HO-91, Hobson's Choice, 2921 Florence Road, Woodbine
- HO-92, Trusty Friend, Frederick Road, Cooksville
- HO-93, BLANK
- HO-94, Samuel Powell House, 8120 Main Street, Ellicott City
- HO-95, Wheatfields, 4588 Montgomery Road, Ellicott City
- HO-96, Elmonte, Furrow Avenue, Ellicott City
- HO-97, John Williams' House, 8086 Main Street, Ellicott City
- HO-98, Lauman House, 8060 Main Street, Ellicott City
- HO-99, Margaret Smith Gallery, 8090 Main Street, Ellicott City
- HO-100, Bicentennial Headquarters Building, 8355 Court Avenue, Ellicott City
- HO-101, St. Paul's Episcopal Church, Old Frederick Road, Mt. Airy
- HO-102, Sarah Jane Powell Log Cabin, 2240 Roxbury Mills Road, Cooksville
- HO-103, Charles Layton, Jr. Log Building, site, 1221 St. Michaels Road, Woodbine
- HO-104, Thaddeus Crapster's Log House, 3101 Cabin Run, Woodbine
- HO-105, Ellicott House, 3500 Woodbine Road, Woodbine
- HO-106, Robert Hunter House, Annapolis Rock Road, Woodbine
- HO-107, George G. Willson Log House, site, Annapolis Rock Road, Woodbine
- HO-108, Hipsley's Mill Road Log Ruins, site, Hipsley Mill Road, Woodbine
- HO-109, Ann B. Dunn's Log House, ruin, Daisy Road & Jennings Chapel Road, Woodbine
- HO-110, Dr. John Hood Owings House, site & Jennings Cemetery, Jennings Chapel Road, Brookville
- HO-111, Happy Retreat, 3100 McNeal Road, Woodbine
- HO-112, J.P. Tarenz Log House, 2898 Duvall Road, Woodbine
- HO-113, Bernard Warfield Farm, 16539 A.E. Mullinix Road, Woodbine
- HO-114, The Heritage Log Building, site, A.E. Mullinix Road, Woodbine
- HO-115, Sunnyside, Woodbine Road, Woodbine
- HO-116, Beldon Patrick Farmhouse, 1960 Daisy Road, Woodbine
- HO-117, Dr. William J. Bryson House, Frederick Road, Cooksville
- HO-118, Albert Schulze Post & Plank Building, site, 1685 St. Michaels Road, Woodbine
- HO-119, Deep Meadow, 3173 Daisy Road, Woodbine
- HO-120, By His Grace, 3710 Roxbury Mills Road, Glenwood
- HO-121, Nancy Valle's Stone House, 4401 Roxbury Mills Road, Brookville
- HO-122, Stephen B. Dorsey Farm Tenant House, 15282 Roxbury Road, Glenelg
- HO-123, Clark Family House, 15081 Roxbury Road, Roxbury Mills
- HO-124, St. Barnabas Episcopal Church, 13135 Forsythe Road, Sykesville
- HO-125, Wavertree, 12961 Triadelphia Road, Ellicott City
- HO-126, Marvin Howard Log Building, Dorsey Mill Road, Glenwood
- HO-127, Linda Byrd Eareckson Stone-Log House, 601 River Road, Sykesville
- HO-128, Judge John L. Clark House, Marriotsville Road, Marriotsville
- HO-129, Alexander Hassan Stone Ruins, Old Frederick Road, Woodstock
- HO-130, Doughoregan Manor Gate House, 3120 Manor Lane, Ellicott City
- HO-131, Enniscorthy, 3412 Folly Quarter Road, Ellicott City
- HO-132, Franciscan Friars Novitiate, 12290 Folly Quarter Road, Ellicott City
- HO-133, Doughoregan Manor Stone House, Old Manor Lane, Ellicott City
- HO-134, William Johnson Estate House, 4411 Manor Lane, Ellicott City
- HO-135, Jack Gebhard House, 4955 Manor Lane, Ellicott City
- HO-136, Joel Kline Farm Ruins, Clarksville Pike, Ellicott City
- HO-137, Hopkins-Brosenne' Stone House, 10281 Baltimore National Pike, Ellicott City
- HO-138, Gerwig-Lintner House, site, 10101 Frederick Road, Ellicott City
- HO-139, Shirley, 10212 Little Brick House Court, Ellicott City
- HO-140, Gary Memorial Methodist Church, Daniels Road, Ellicott City
- HO-141, The Lawn, 6036 Old Lawyers Hill Road, Elkridge
- HO-142, Old St. Johns Rectory, 3508 W. Gate Drive, Ellicott City
- HO-143, MacAlpine Slave Quarters, 3645 Mac Alpine Road, Ellicott City
- HO-144, Wayside Inn, 4344 Columbia Road, Ellicott City
- HO-145, Mt. Joy, 5000 Executive Park Drive, Ellicott City
- HO-146, Stempner House, 5777 Main Street, Elkridge
- HO-147, Eklof House, 494 New Cut Road, Ellicott City
- HO-148, Frank Boggs House, 5306 Waterloo Road, Ellicott City
- HO-149, Clover Hill, 6121 Rockburn Branch Park Road, Elkridge
- HO-150, Alice L. Lorenz House, Elkridge
- HO-151, Rockburn, 6581 Belmont Woods Road, Elkridge
- HO-152, Hockley Grist Mill House, 5481 Levering Avenue, Elkridge
- HO-153, Fairview, 10150 Gorman Road, Laurel
- HO-154, Kelly Stone House, 5509 Old Columbia Road, Columbia
- HO-155, Gales-Gaither Stone House, 5505 Old Columbia Road, Columbia
- HO-156, Dalton, 9315 Mellenbrook Road, Columbia
- HO-157, Alabama Farm, site, Trotter Road, Columbia
- HO-158, River Hill Farm, Guilford Road, Clarksville
- HO-159, Oakland Farms, 14175 Old Frederick Road, Cooksville
- HO-160, Bassler House, Sunny Spring, Columbia
- HO-161, John L. Due House, 6044 Trotter Road, Clarksville
- HO-162, Sturdevant Building, Clarksville Pike, Clarksville
- HO-163, Tierney Gambrel Roof House, site, Guilford Road & Clarksville Pike, Clarksville
- HO-164, Clifton, 6420 Warm Sunshine Path, Clarksville
- HO-165, Owings-Myerly House, site, 7538 Guilford Road, Simpsonville
- HO-166, St. Mark's Episcopal Church, 12700 Hall Shop Road, Highland
- HO-167, Locust Grove, 1095 Hood's Mill Road, Cooksville
- HO-168, Banks Schoolhouse, 15491 Roxbury Mills Road, Glenwood
- HO-169, Roxbury Mill Miller's House, 4102 Roxbury Mill Road, Brookeville
- HO-170, Shipley's Adventure, 14830 Old Frederick Road, Clarksville
- HO-171, Hedgerow, Underwood Road, Sykesville
- HO-174, Tubman House, 7250 Baltimore Washington Boulevard, Elkridge
- HO-175, Judge William Matthew's House, 2945 Roxbury Mills Road, Glenwood
- HO-176, Glenwood Country Club Building, 2902 Roxbury Mills Road, Glenwood
- HO-177, Holly Rock Farm, 3060 Roxbury Mills Road, Glenwood
- HO-178, Schroll House, 8418 A Baltimore Washington Boulevard, Jessup
- HO-179, Factory House,site, Old Scaggsville Road, Scaggsville
- HO-180, Hobbs Regulation, 2555 McKendree Road, Glenwood
- HO-181, R. Hook Log House, 14465 Frederick Road, Cooksville
- HO-182, Mrs. Miller Mills House, 13523 Triadelphia Road, Ellicott City
- HO-183, Day House and Store, 14040 Triadelphia Road, Glenelg
- HO-184, Old Oakland Manor, 10026 Hyla Brook Road, Columbia
- HO-185, Oakland Manor Blacksmith Shop, 10102 Hyla Brook Road, Columbia
- HO-186, Clarkland Farm & Log Smokehouse, 10380 Clarksville Pike, Ellicott City
- HO-187, Harmony Cemetery, McKendree Road, West Friendship
- HO-188, Granite Park, Murray Hill Drive, Columbia
- HO-189, Humphrey Wolfe Farm, 3607 Roxbury Mills Road, Glenwood
- HO-190, Good Fellowship, 1795 Woodstock Road, Woodstock
- HO-191, Roland Maxwell Farmhouse, 1805 Marriottsville Road, Marriottsville
- HO-192, Friendship Pines, 13905 Frederick Road, Cooksville
- HO-193, Linwood, 3421 Martha Bush Drive, Ellicott City
- HO-194, Welsh-Webb Farm, site, 16180 Frederick Road, Woodbine
- HO-195, Fowble House, site, Frederick Road, Lisbon
- HO-196, Flohr House, site, Frederick Road, Lisbon
- HO-197, Cheaks Tavern, site, Frederick Road, Lisbon
- HO-198, Cope-Knox Log House, site, 16041 Frederick Road, Lisbon
- HO-199, Methodist Episcopal Parsonage, site, 16037 Frederick Road, Lisbon
- HO-200, Alvin G. Leamon House, 16032 Frederick Road, Lisbon
- HO-201, Mathis House, 16024 Frederick Road, Lisbon
- HO-202, Mayne House, 16020 Frederick Road, Lisbon
- HO-203, Emerson Pickett Log House, site, Frederick Road, Lisbon
- HO-204, Lisbon Presbyterian Manse, 16000 Frederick Road, Lisbon
- HO-205, Lee's Market and House, 16005 Frederick Road, Lisbon
- HO-206, Lisbon Hotel, Frederick Road & Madison Street, Lisbon
- HO-207, Westwood M.E. Church, 13554 Triadelphia Road, Ellicott City
- HO-208, Brown Chapel U.M. Church, Howard Road, Dayton
- HO-209, Providence Church, 14290 Triadelphia Road, Glenwood
- HO-210, E. Walter Scott Farmhouse, 6791 Guilford Road, Clarksville
- HO-211, Dundee, 3775 Bonny Bridge Place, Ellicott City
- HO-212, Dundee Smokehouse, Bonny Bridge Place, Ellicott City
- HO-213, Savage Mill, Foundry Street & Washington Street, Savage
- HO-214, Carroll Baldwin Memorial Hall, 9035 Foundry Street, Savage
- HO-215, 19th Century Mill Workers Houses, 9040-9062 Washington Street, Savage
- HO-216, Old Mill Apartment House, 9078 Washington Street, Savage
- HO-217, Old Mill Workers Apartment House, 9105-9111 Washington Street, Savage
- HO-218, Savage-Irving House, 9110 Washington Street, Savage
- HO-219, Masonic Hall, 2-4 Washington Street, Savage
- HO-220, Holte-Grafton House, 8502 Fair Street, Savage
- HO-221, Hutchinson-Hobbs House, 9132-9136 Baltimore Street, Savage
- HO-222, Gralton's Apartment House, 9105-9111 Baltimore Street, Savage
- HO-223, Chickering House, 9066 Baltimore Street, Savage
- HO-224, Minnie W. Rooney House, 9056-9058 Baltimore Street, Savage
- HO-225, Mill Workers Houses, Savage
- HO-226, Victor Myers Farmhouse, 9915 Gorman Road, Laurel
- HO-227, Lewis Warfield House, 15948 Frederick Road, Lisbon
- HO-228, Dorsey-Hall House, site, Frederick Road, Lisbon
- HO-229, Roy Martin House, site, Frederick Road, Lisbon
- HO-230, Lisbon Female School, 15928 Frederick Road, Lisbon
- HO-231, Paul Joggereit House, 15927 Frederick Road, Lisbon
- HO-232, Esworthy House, 15935 Frederick Road, Lisbon
- HO-233, The Misses Warfield House, 15947 Frederick Road, Lisbon
- HO-234, Zubovic Farmhouse, 1259 Ridge Road, Mt. Airy
- HO-235, St. Stephens A.M.E. Church, 7741 Mayfield Avenue, Elkridge
- HO-236, Overlook Farms, Murray Hill Road, Laurel
- HO-237, Stansfield House, Gorman Road, Laurel
- HO-238, Glenelg Gardeners Cottage, 12789 Folly Quarter Road, Glenelg
- HO-239, The Herbiary, 12549 Folly Quarter Road, Ellicott City
- HO-240, McKendree Methodist Church, McKendree Road, West Friendship
- HO-241, Ellicott Family Burial Grounds, Old Frederick Road, Ellicott City
- HO-242, Joseph Ellicott House, 8262 Old Frederick Road, Ellicott City
- HO-243, The Oaks, 3251 Oaks Road, Ellicott City
- HO-244, Lisbon Methodist Church, site, Frederick Road & Hopkins Alley, Lisbon
- HO-245, Warner-Hawks House, site, 16033 Frederick Road, Lisbon
- HO-246, Powers House, 16025 Frederick Road, Lisbon
- HO-247, Buckingham House, 16021 Frederick Road, Lisbon
- HO-248, Harmony Church, 15996 North Avenue, Lisbon
- HO-249, Ridgely-Mercier House, 15921 Frederick Road, Lisbon
- HO-250, Howard Chapel U.M. Church, 1970 Long Corner Road, My. Airy
- HO-251, Klein-Flynn House, 1614 Long Corner Road, Mt. Airy
- HO-252, Warfield-Dougherty Store, 2600 Woodbine Road, Woodbine
- HO-253, Old Florence School, 3055 Florence Road, Woodbine
- HO-254, Jennings Chapel U.M. Church, 2601 Jennings Chapel Road, Woodbine
- HO-255, Warfield Family Cemetery, Jennings Chapel Road, Woodbine
- HO-256, Albert Warfield Victorian House, 3300 Florence Road, Woodbine
- HO-257, Albert Warfield Tenant House, 3370 Florence Road, Woodbine
- HO-258, Daisy Trading Post and House, 15948 Union Chapel Road, Woodbine
- HO-259, Daisy I.O.O.F. Building, site, 15949 Union Chapel Road, Woodbine
- HO-260, Kimble's Cottage, 15698 Union Chapel Road, Woodbine
- HO-261, Fulfillment, Union Chapel Road, Woodbine
- HO-262, Myers Apartment Building, site, Roxbury Mills Road & McKendree Road, Glenwood
- HO-263, House of Silence, 15780 Union Chapel Road, Woodbine
- HO-264, Chippendale Farm, 14751 Addison Way, Woodbine
- HO-265, Warfield's Range Log Cabin, site, 10504 Patuxent Ridge Way, Laurel
- HO-266, Warfield's Range, 10504 Patuxent Ridge Way, Laurel
- HO-267, Wildwood, Guilford Road, Columbia
- HO-268, Hatfield Residence, 6691 Cedar Lane, Columbia
- HO-269, Charles Scaggs House, 10909 Johns Hopkins Road, Laurel
- HO-270, Oak Grove Cemetery, Roxbury Mills Road & Union Chapel Road, Glenwood
- HO-271, Oakhurst, 2460 McKendree Road, West Friendship
- HO-272, Warfield Cemetery, 14675 Carrs Mill Road, Glenwood
- HO-273, Toomey House, 5730 Furnace Road, Elkridge
- HO-274, Hubert Black House, 2416 Woodbine Road, Woodbine
- HO-275, Daisy United Methodist Church, 2685 Daisy Road, Woodbine
- HO-276, Mt. Gregory United Methodist Church, 2325 Roxbury Mills Road, Cooksville
- HO-277, St. Louis King Roman Catholic Church and Cemetery, 12500 Clarksville Pike, Clarksville
- HO-278, Tranquility, 4054 Jennings Chapel Road, Brookeville
- HO-279, Harwood, 3676 Jennings Chapel Road, Woodbine
- HO-280, Arthur Forsyth House, 14396 Old Frederick Road, Cooksville
- HO-281, Wilderness Farm, 3366 Jennings Chapel Road, Woodbine
- HO-282, Limestone Valley Farm Stone Tenant House, Sheppard Lane, Clarksville
- HO-283, Kefauver Boarding House, 8507 Old Frederick Road, Ellicott City
- HO-284, Oak Lawn, 8360 Court Place, Ellicott City
- HO-285, Weir House, 8324 Court Avenue, Ellicott City
- HO-286, Trollinger Cabin, Main Street, Ellicott City
- HO-287, Cattail Farm, 4078 Roxbury Mills Road, Glenwood
- HO-288, Ruth Daggett House, 1276 Hoods Mill Road, Cooksville
- HO-289, Meriweather, 14944 Roxbury Road, Glenelg
- HO-290, St. Michaels Roman Catholic Church, St. Michael Road & Hardy Road, Mt Airy
- HO-291, Oakley Farm, 15802 Frederick Road, Woodbine
- HO-292, Joshua Disney Wheelwright Shop, Clarksville Pike, Highland
- HO-293, King's Contrivance, Shaker Drive, Columbia
- HO-294, Wilson House at Roxbury Mill, 4152 Roxbury Mill Road, Brookeville
- HO-295, Woodcamp Farm, 17403 Hardy Road, Mt. Airy
- HO-296, Earl Hough Farmhouse, 17520 Hardy Road, Mt. Airy
- HO-297, Rose Hill, 979 Hood's Mill Road, Cooksville
- HO-298, St. Peters Rectory & Parish House, 8205 St. Paul Place, Ellicott City
- HO-299, St. Peters Episcopal Church, site, St. Paul Place, Ellicott City
- HO-300, Broxton, 3829 Old Columbia Pike, Ellicott City
- HO-301, Tuten's Cottage, site, 3825 Old Columbia Pike, Ellicott City
- HO-302, Charles Ringley's House, 3820 Old Columbia Pike, Ellicott City
- HO-303, Bruce Smyser's Double House, 3815 Old Columbia Pike, Ellicott City
- HO-304, Paul Perkins House, 3821 Old Columbia Pike, Ellicott City
- HO-305, Esther Rettger's Two-Part House, 3801-3803 Old Columbia Pike, Ellicott City
- HO-306, Friends Meeting House Historic Marker, Old Columbia Pike, Ellicott City
- HO-307, David Myer's House, 3786-3790 Old Columbia Pike, Ellicott City
- HO-308, Manelli Cottage, 3774 Old Columbia Pike, Ellicott City
- HO-309, Esther Rettger's Shop, 3752-3754 Tongue Row, Ellicott City
- HO-310, Rebel Trading Post & The Arms Room, 3744-3748 Tongue Row, Ellicott City
- HO-311, R&R Unlimited Antiques, 3736-3742 Tongue Row, Elliott City
- HO-312, Hi Ho Silver, 3732 Tongue Row, Ellicott City
- HO-313, George Anderson Shop, 3723 Tongue Row, Ellicott City
- HO-314, Clarkland Farm Stone Tenant House, 10570 Clarksville Pike, Columbia
- HO-315, George Burgess House, 8448 Main Street, Ellicott City.
- HO-316, Search Enclosed, 4119 Old Columbia Pike, Ellicott City
- HO-317, Tilghman Grocery Store & House, 5733-5739 Main Street, Elkridge
- HO-318, EMPTY
- HO-319,The Tilghman-Ferraro House, 5741-5745 Main Street, Elkridge
- HO-320, Pocock-Rodgers House, 5749-5753 Main Street, Elkridge
- HO-321, Gonzales House, 5761 Main Street, Elkridge
- HO-322, Pfeiffer's Corner Blacksmith Shop House, 5961 Waterloo Road, Ellicott City
- HO-323, NO NAME, 8080 Main Street, Ellicott City
- HO-324, Mathews-E.T. Clark House, 8765 Ruppert Court, Ellicott City
- HO-325, Caleb Merryman's Two Frame Buildings, 8329-8333 Main Street, Ellicott City
- HO-326, Bill Robbins & Carter Building, Ellicott City
- HO-327, Kloman Building, 5765 Main Street, Elkridge
- HO-328, Kraft Cottage, 3896 Old Columbia Pike, Ellicott City
- HO-329, Howard Lodge #101 Masonic Building, 5814 Main Street, Elkridge
- HO-330, Phoenix Emporium, 8053 Main Street, Ellicott City
- HO-331, Oakland Manor Slave Quarters, 10102 Hyla Brook Road, Columbia
- HO-332, Oliver Viaduct, Main Street, Ellicott City
- HO-333, Ellicott Cottage Lots 3 & 4, 3793 Mulligan Hill Lane, Ellicott City
- HO-334, George White Shop, 8624 Main Street, Ellicott City
- HO-335, Rorabaugh House, 10750 Guilford Road, Annapolis Junction
- HO-336, William Moore House, 8532-8534 Main Street, Ellicott City
- HO-337, Asbury M. E. Church, Guilford Road, Annapolis Junction
- HO-338, Sam Caplan House, 8454 Main Street, Ellicott City
- HO-339, Sam Caplan's Cottage, site, 8454 Main Street, Ellicott City