- Brooklyn Museum3
- Brown, Charles A., active 19054
- Brown, Harry E., Mrs., active 19068
- Brown, Harry E., active 190612
- Burnham and Root17
- Cain, Walker O., 1915-1993398
- Carnegie Endowment for International Peace1
- Carr, William S., active 191615
- Chandler Improvement Company6
- Chandler, Alexander J. (Alexander John), 1859-195020
- Cheney, Edwin H. (Edwin Henry)26
- Clark, Irving (Washington Irving), 1863-191810
- Clarke, Cora, 1875-196233
- Clarke, Robert, 1874-193833
- Clink, Theo1
- Coburn, F. A.1
- Como Orchard Land Company16
- Converse, Clarence, active 19166
- Coonley, Avery, 1870-1920131
- Coonley, Queene Ferry131
- Copeland, Frances, 1862-193620
- Copeland, William, 1860-194420
- Crow, Jules T.1
- Cudney, Ralph, 1866-19359
- Cudney, Wellington, 1861-19319
- Curtis publishing company24
- Cutten, Arthur, 1870-193616
- Cutten, Maud, 1870-196116
- Dana, Susan M. Lawrence, 1862-194636
- Davenport, Arthur (Edward Arthur), 1867-194518
- Davenport, Susan, 1870-193118
- Davidson, Christiana, 1879-194910
- Davidson, Walter V.46
- Day, Agnes, 1862-194171
- DeRhodes, Kersey, 1862-194419
- DeRhodes, Laura, 1864-195219
- Delano & Aldrich1
- Devin, Aline, 1865-19385
- Devin, David, 1849-18983
- District of Columbia. Commission on the Improvement of the Park System12
- Douglas L. Elliman and Co., Inc.1
- Dreyer, Louis H.2
- Eagle Iron Works (New York, N.Y.)1
- Egan, Alice, 1878-5
- Emery Roth and Sons1
- Ennis, Charles W., 1858-192831
- Ennis, Mabel, 1863-195431
- Esbenshade, Abram, 1849-191413
- Esbenshade, Alice, 1877-192413
- Evans, Raymond W., active 190818
- Fabyan, George, 1867-19364
- Fabyan, Nellie, 1866-19394
- Faulkner, Barry, 1881-19662
- Fawcett, Harriet, 1922-199323
- Fawcett, Randall, 1921-200623
- Ferriss, Hugh, 1889-1962180
- Fisher, Jesse, 1931-201421
- Foster, Dorothy Martin10
- Foster, James, 1895-195510
- Foster, Mary, 1869-19589