Massachusetts - Significance region: Local
| Clifford-Warren House |
| Cliff, Z. E., House |
| Clinton African Methodist Episcopal Zion Church |
| Clinton Wire Cloth Company Historic District |
| Clough, Benjamin F., House |
| Cloverden |
| Cluett Peabody & Company |
| Cobb Memorial Library |
| Cobb's Tavern |
| Codding Farm, The |
| Coddington School |
| Codman Building |
| Codman Square District |
| Cogan, Bernard, House |
| Cogan, James, House |
| Coggin, Gilman, House |
| Cogswell's Grant |
| Cohannet Mill No. 3 |
| Cohasset Central Cemetery |
| Cohasset Common Historic District |
| Colburn, Gilbert, House |
| Colburn School |
| Colburn School-High Street Historic District |
| Colby, Samuel, House |
| Cole, Benjamin, House |
| Cole, E. Merritt, House |
| Cole House |
| Coleman Bridge |
| Collins Building |
| Collins Cottages Historic District |
| Colonial Beacon Gas Station |
| Colonial Block |
| Colony Historic District |
| Colrain Center Historic District |
| Columbia Road-Bellevue Street Historic District |
| Columbia Road-Devon Street Historic District |
| Columbia Road-Strathcona Road Historic District |
| Columbus Avenue and Bragdon Street Historic District |
| Comins-Wall House |
| Commanding Officer's Quarters, Watertown Arsenal |
| Common District |
| Common Historic District |
| Common Street Cemetery |
| Commonwealth Avenue Historic District |
| Commonwealth Avenue Historic District |
| Commonwealth Pier Five |
| Commonwealth Shoe and Leather Co. |
| Community House |
| Community Memorial Hospital |
| Company F State Armory |
| Compton Building |
| Concord Armory |
| Concord Square Historic District |
| Congregation Adath Jeshurun |
| Congregation Agudath Shalom |
| Congregational Church |
| Congregational Church of West Stockbridge |
| Congress Street Fire Station |
| Conkey-Stevens House |
| Conway Center Historic District |
| Cook, Asa M., House |
| Cook, Thomas, House |
| Coolidge, Josiah, House |
| Coolidge School |
| Cooper-Davenport Tavern Wing |
| Copp's Hill Terrace |
| Coram Shipyard Historic District |
| Corcoran School |
| Cottage Farm Historic District |
| Cottage-Freeman Historic District |
| Cotting, John, House |
| Cove Burying Ground |
| Cove Street Historic District |
| Cowdrey, George, House |
| Cowdry, Jonas, House |
| Cowdry, Nathaniel, House |
| Crabtree, Thomas, Three-Decker |
| Crafts Street City Stable |
| Craigie Arms |
| Cranch School |
| Crane, Frank W., House |
| Cranesville Historic District |
| Crawford Street Historic District |
| Crimmins, Thomas A., House |
| Crocker, Benomi and Barnabas, House |
| Crocker Field Historic District |
| Crocker, Lot, House |
| Crombie Street District |
| Crosby, Daniel, House |
| Crossman Bridge |
| Crowell, C. C., House |
| Crowley House |
| Crystal Street Historic District |
| Cuming, Dr. John, House |
| Cummings, E. B., House |
| cummings, e.e., House |
| Curtis Building |
| Curtis, Noah, House |
| Curtis, Paul, House |
| Curtis, Thomas, House |
Data from United States Park Service and Wikidata
