Maine - Criteria: A (event)
| Abyssinian Meeting House |
| Academy Building |
| Acadian Historic Buildings |
| Acadian Landing Site |
| Adams-Pickering Block |
| Agassiz Bedrock Outcrop |
| Albany Town House |
| Alfred Historic District |
| Alfred Shaker Historic District |
| Allan, Harold, Schoolhouse |
| All Soul's Chapel |
| Alna Meetinghouse |
| Alna School |
| Ambajejus Boom House |
| American Boathouse |
| AMERICAN EAGLE (schooner) |
| American Woolen Company Foxcroft Mill |
| Anderson Bros. Store |
| Andover Hook and Ladder Company Building |
| Andover Public Library |
| Androscoggin County Courthouse and Jail |
| Androscoggin Mill Block |
| Androscoggin Swinging Bridge |
| Androscoggin Yacht Club |
| Anson Grange #88 |
| Arch Bridge |
| Arnold Trail to Quebec |
| Aroostook County Courthouse and Jail |
| Auburn Commercial Historic District |
| Auburn-Harpswell Association Historic District |
| Augusta City Hall, Former |
| Austin-Hennessey Homestead |
| BAGHEERA (schooner) |
| Bailey, Charles M., Library |
| Bailey Island Cobwork Bridge |
| Bailey Island Library Hall |
| Baker Island Light Station |
| Bangor Children's Home |
| Bangor House |
| Bangor Mental Health Institute |
| Bangor Theological Seminary Historic District |
| Barker Mill |
| Bass Boarding House |
| Bass Harbor Head Light Station |
| Bass Harbor Memorial Library |
| Bates Mill Historic District |
| Bath Historic District |
| Battery Steele |
| Baxter House |
| Bayside Historic District |
| Bear Island Light Station |
| Beckett's Castle |
| Belfast Commercial Historic District |
| Belfast Historic District |
| Belfast National Bank |
| Bell Hill School |
| Bennett Bridge |
| Benton Grange #458 |
| Berwick Academy |
| Berwick High School |
| Biddeford City Hall |
| Biddeford Main Street Historic District |
| Biddeford-Saco Mills Historic District |
| Bingham Free Meetinghouse |
| Birch Island House |
| Black Horse Tavern |
| Blackwoods Campground |
| Bloomfield Academy |
| Blue Hill Historic District |
| Boarding House and Storehouse at Churchill Depot |
| Bodwell Water Power Company Plant |
| Bond Street Historic District |
| Boon Island Light Station |
| Boothbay Harbor Memorial Library |
| BOWDOIN (schooner) |
| Bowman-Carney House |
| Boynton High School, Former |
| Bradford Farm Historic District |
| Bray House |
| Breakwater, The |
| Bremen Town Hall, Former |
| Brewer High School |
| Brickett Place |
| Brick School |
| Brick School |
| Brick School House |
| Bridgewater Town Hall and Jail |
| Briggs, William, Homestead |
| Broad Street Historic District |
| Broadway Historic District |
| Brown House |
| Brown Memorial Library |
| Browns Head Light Station |
| Brunswick Commercial Historic District |
| Building at 84-96 Hammond Street |
| Burgess House |
| Burnell Tavern |
| Burnham Tavern |
| Burnt Coat Harbor Light Station |
| Burnt Island Light Station |
Data from United States Park Service and Wikidata
