Massachusetts - Role: Building
| Coddington School |
| Codman Building |
| Coffin, Jethro, House |
| Cogan, Bernard, House |
| Cogan, James, House |
| Coggin, Gilman, House |
| Cogswell's Grant |
| Cohannet Mill No. 3 |
| Coker, Benjamin, House |
| Colburn, Gilbert, House |
| Colburn, Sarah Foster, House |
| Colburn School |
| Colby Hall |
| Colby, Samuel, House |
| Cole, Benjamin, House |
| Cole, E. Merritt, House |
| Cole House |
| Collins Building |
| Collins, Frederick, House |
| Collins, William, House |
| Colonial Beacon Gas Station |
| Colonial Block |
| Colton's Block |
| Comfort Station |
| Comins-Wall House |
| Commanding Officer's Quarters, Watertown Arsenal |
| Commonwealth Pier Five |
| Commonwealth Shoe and Leather Co. |
| Community House |
| Community Memorial Hospital |
| Company F State Armory |
| Compton Building |
| Conant, Exercise, House |
| Concord Armory |
| Congregation Adath Jeshurun |
| Congregation Agudath Shalom |
| Congregational Church |
| Congregational Church of West Stockbridge |
| Congress Street Fire Station |
| Conkey-Stevens House |
| Connell, William M., School |
| Conventual Church of St. Mary and St. John |
| Converse Memorial Building |
| Cook, A. E., House |
| Cook, Asa M., House |
| Cook, Thomas, House |
| Cook, William, House |
| Coolidge, Calvin, House |
| Coolidge, Josiah, House |
| Coolidge School |
| Cooper-Davenport Tavern Wing |
| Cooper-Frost-Austin House |
| Copeland, Samuel, House |
| Corcoran School |
| Corey, Timothy, House No. 1 |
| Corey, Timothy, House No. 2 |
| Cornell Mills |
| Corner Lunch |
| Corning, Samuel, House |
| Cotting, John, House |
| Coughlin School |
| Cowdrey, George, House |
| Cowdry, Jonas, House |
| Cowdry, Nathaniel, House |
| Crabtree, Thomas, Three-Decker |
| Crafts Street City Stable |
| Craigie Arms |
| Cranch School |
| Crane and Company Old Stone Mill Rag Room |
| Crane, Frank W., House |
| Crane, Thomas, Public Library |
| Crawford, Elias, House |
| Crescent Mill |
| Crimmins, Thomas A., House |
| Crocker, Benomi and Barnabas, House |
| Crocker, Capt. Alexander, House |
| Crocker, Ebenezer, Jr., House |
| Crocker, Lot, House |
| Crompton Loom Works |
| Crosby, Daniel, House |
| Crowell-Bourne Farm |
| Crowell, C. C., House |
| Crowell-Smith House |
| Crowley House |
| Crowninshield House |
| Cuffe, Paul, Farm |
| Cuming, Dr. John, House |
| Cummings, E. B., House |
| cummings, e.e., House |
| Curtis Building |
| Curtis, Noah, House |
| Curtis, Paul, House |
| Curtis, Thomas, House |
| Curtis, William, House |
| Cushing, Caleb, House |
| Cushing, Caleb, House and Farm |
| Cushing Homestead |
| Cushman House |
| Cutler and Porter Block |
| Cutter, Ephraim, House |
Data from United States Park Service and Wikidata
