Maine - Criteria: A (event)
| Burton, Benjamin, Garrison Site |
| Bussey, Louis I., School |
| Buxton Powder House |
| Calais Free Library |
| Calais Historic District |
| Calais Observatory |
| Calais Residential Historic District |
| Camden Great Fire Historic District |
| Camden Yacht Club |
| Canadian Pacific Railway Depot, Greenville Junction, Maine |
| Cape Arundel Golf Club |
| Cape Arundel Summer Colony Historic District |
| Cape Neddick Light Station |
| Capitol Complex Historic District |
| Carrabasset Inn |
| Carriage Paths, Bridges and Gatehouses |
| Carver Memorial Library |
| Castine Historic District |
| Caswell Public Library (Former) |
| Cate House |
| Cathedral of the Immaculate Conception |
| Center Meeting House and Common |
| Chandler-Parsons Blacksmith Shop |
| Chandler Store |
| Chapman-Hall House |
| Charlotte Pound |
| Chase, Squire, House |
| Cherryfield Academy |
| Cherryfield Historic District |
| Chestnut Street Historic District |
| Chesuncook Village |
| Children's Hospital |
| China Village Historic District |
| Clapp, Charles Q., House |
| Claremont Hotel |
| Clark, Edmund and Rachel, Homestead |
| Clary Mill |
| Cleaveland, Parker, House |
| Clifford, Nathan, School |
| Cliffwood Hall |
| Cobbossee Lighthouse |
| Coburn, John G. |
| Colburn House State Historic Site |
| Colburn School |
| Colburn, William, House |
| College Club Inn |
| Colonial Apartments |
| Colonial Inn |
| Colonial Theater |
| Columbia House |
| Common, The |
| Conant-Sawyer Cottage |
| Continental Mill Housing |
| Conway House |
| Conway Junction Railroad Turntable Site |
| Cony High School |
| Coplin Plantation Schoolhouse |
| CORA F. CRESSEY |
| Corinth Town Hall and Corinthian Lodge #59, I.O.O.F. |
| Crescent Lodge |
| Criterion Theatre |
| Crooker, W. D., House |
| Crosby Street Historic District |
| Crystal Spring Farm |
| Cuckolds Light Station |
| Cumberland and Oxford Canal |
| Cumberland Mills Historic District |
| Cummings' Guest House |
| Cummings Shoe Factory |
| Curtis Island Light |
| Curtis, John B., Free Public Library |
| Cushnoc (ME 021.02) |
| Cutler Memorial Library |
| Damariscotta Baptist Church |
| Damariscove Lifesaving Station |
| Danville Junction Grange #65 |
| Dark Harbor Shop |
| Davis, Dalton Holmes, Memorial Library |
| Days Ferry Historic District |
| Deering Estate Barn |
| Deering, J. G., House |
| Deering Street Historic District |
| Deertrees Theatre |
| Dexter Grist Mill |
| District #5 School House |
| District No. 1 Schoolhouse |
| District No. 5 School |
| Division No. 9 School |
| Dixmont Town House |
| Dominican Block |
| Donovan-Hussey Farms Historic District |
| Dorfield Farm |
| Doubling Point Light Station |
| Dresden Brick School House |
| Dresden Town House |
| Duck Cove School |
| Dudley Block |
| Dudley's Corner School House |
| Duncan, Beecher H., Farm |
| Dyer-Hutchinson Farm |
Data from United States Park Service and Wikidata
