Following is a list of individually-designated landmark properties in Portland, many of which are also listed in the National Register of Historic Places. Some landmark properties are located within the boundaries of a larger historic district; others are not. Given the significance of landmarks, any exterior alteration or addition requires review and approval--whether or not the change will be visible from a public way.

(* Indicates a National Historic Landmark)

Individually Designated Landmark Properties
Sparrow House	35 Arlington St.
John Calvin Stevens House	52 Bowdoin St.
Portland City Hospital	1145 Brighton Ave.
Leonard Bond Chapman House	90 Capisic St.
Chestnut Street Methodist Church	11-19 Chestnut St.
St. Lawrence Church and Parish Hall (church demolished 2008 due to structural failure)	76 Congress St.
Portland Observatory *	138 Congress St.
Ann Freeman House	147 Congress St.
North School	264-284 Congress St.
St. Paul's Church and Rectory	279 Congress St.
Portland City Hall	389 Congress St.
Masonic Temple	415 Congress St.
First Parish Church	425 Congress St.
Lancaster Block	474 Congress St.
Maine Historical Society	485 Congress St.
Wadsworth-Longfellow House *	487 Congress St.
Mechanics Hall	519 Congress St.
Porteous Mitchell & Braun Department Store	522 Congress St.
J.B. Brown Memorial Block	529-543 Congress St.
H.H. Hay Building	594 Congress St.
Baxter Library	619 Congress St.
General Neal Dow House *	714 Congress St.
Maine Eye and Ear Infirmary	794-800 Congress St.
Cathedral of Immaculate Conception	307 Congress St.
Portland High School	284 Cumberland Ave.
Victoria Mansion *	109 Danforth St.
Thomas Brackett Reed House *	30-32 Deering St.
Nathan Clifford School	180 Falmouth St.
United States Courthouse	156 Federal St.
United States Custom House	312 Fore St.
Mariner's Church	368-374 Fore St.
Tracy-Causer Building	507 Fore St.
Portland Stage Company	25 Forest Ave.
United States Post Office Building	125 Forest Ave.
Fort Gorges	Hog Island Ledge
Byron Greenough Block	Free St. and Middle St.
McLellan-Sweat Mansion *	111 High St.
Eastland Hotel	157 High St.
Griffin House	200 High St.
Longfellow Monument	Longfellow Square
54-56 Maple Street	54-56 Maple Street
Thompson Block	117-125 Middle St.
Rackleff Building	127-133 Middle St.
51 Monument Street	51 Monument Street
Woodman Building	133-141 Middle St.
Charles Q. Clapp Block	Monument Square
Abyssinian Meeting House	75 Newbury St.
John B. Russworm House	238 Ocean Ave.
William Monott House	45 Park St.
Park Street Row	88-114 Park St.
William Nutter House	68 Pleasant St.
Fifth Maine Regiment Building	Peaks Island
Green Memorial A.M.E. Zion Church	46 Sheridan St.
Charles Q. Clapp House	97 Spring St.
Maine Central Railroad Office Building	222-224 Saint John St.
Joseph Holt Ingraham House	51 State St.
Portland Club	156 State St.
F.O.J. Smith Tomb	Stevens Ave.
Williston-West Church and Parish House	32 Thomas St.
Maine Hospital	331 Veranda St.
A.B. Butler House	4 Walker St.
Tate House *	1270 Westbrook St.
Adam P. Leighton House	261 Western Promenade
Nathaniel Dyer House	168 York St.
Maine Archeological Site No. 9-16