Biographies from the fourth and final volume are currently going online, with completion projected for sometime in 2026.
- Photo: Adams, John Quincy (IV, 191)
- Photo: Adams, Sanford (III, 533)
- Photo: Agne, Charles H. F. (III, 491)
- Photo: Aldridge, James Lyon (III, 623)
- Photo: Alexander, John (III, 593)
- Photo: Andrews, George Wood (III, 767)
- Photo: Arkell, James (Senator) (III, 23)
- Photo: Bailey, Charles (III, 515)
- Photo: Baker, Ashley D. L. (III, 295)
- Photo: Baldwin, Sylvester C. (III, 610)
- Photo: Baringer, Edward M. (IV, 89)
- Photo: Barns, Frederic C. (III, 449)
- Photo: Beach, Samuel H. (III, 427)
- Photo: Benton, Charles E. (III, 37)
- Photo: Best, Tharratt Gilbert (Captain) (III, 503)
- Photo: Betts, Otis A. (III, 683)
- Photo: Block, Robert (IV, 137)
- Photo: Bosworth, Frank A. (IV, 95)
- Painting: Bouck, William C. (Governor) (II, 1313)
- Photo: Boyce, Isaac M. (III, 773)
- Painting: Brant, Joseph (I, 791)
- Painting: Brayton, Merrill Jesse (III, 31)
- Photo: Breen, Ella Mae Flynn (Mrs. Thomas) (III, 442)
- Photo: Breen, John (IV, 71)
- Photo: Breen, Thomas (III, 443)
- Photo: Brower, Abram Giles (M. D.) (IV, 21)
- Photo: Brower, Abram Vedder) (IV, 27)
- Photo: Brower, Egmont Giles (IV, 26)
- Photo: Brown, T. Forrest (Captain) (III, 415)
- Photo: Brownell, William Henry (M. D.) (III, 55)
- Photo: Burney, Ivan Thomas (III, 433)
- Photo: Burrell, David Hamlin (III, 50)
- Photo: Burrows, Charles Henry (III, 527)
- Photo: Carpenter, Erwin C. (III, 133)
- Photo: Cassedy, William Spencer (Hon.) (III, 509)
- Photo: Collins, James William (III, 461)
- Photo: Conant, Eugene Henry (III, 409)
- Photo: Conyne, Edward A. (III, 773)
- Photo: Cookinham, Henry J. (III, 43)
- Photo: Crowe, Peter (III, 677)
- Photo: Crumb, Everett F. (III, 689)
- Photo: Cullings, Emmett H. (III, 575)
- Photo: Cushman, Charles Wallace (III, 61)
- Photo: Davis, George T. (Hon.) (III, 397)
- Photo: De Angelis, Pascal C. J. (Hon.) (IV, 41)
- Photo: De Rosa, Angelo (III, 485)
- Photo: Devendorf, Irving R. (Hon.) (III, 67)
- Photo: Dewhurst, Johnson C. (III, 617)
- Photo: Dibble, Everett W. (III, 545)
- Photo: Doody, Daniel (Mgr.) (IV, 161)
- Photo: Douglas, Fred James (M. D.) (III, 73)
- Photo: Sawyer, Ralph William (D. M. D.) (III, 695)
- Photo: Doyle, William J. (III, 701)
- Photo: Dunlop, David Lawthorne (III, 587)
- Photo: Dunmore, Watson Thomas (III, 85)
- Photo: Eckert, Adam James (IV, 179)
- Photo: Edison, Thomas A. in Edison and Steinmetz (II, 1585)
- Photo: Fagan, Albert Lansing (M. D.) (III, 467)
- Photo: Filkins, Delina Ecker "Grandma" (II, 1804)
- Photo: Firsching, Joseph A. (III, 551)
- Photo: Fish, Henry H. (III, 91)
- Photo: Fraser, Robert (III, 97)
- Photo: Furlong, Richard R. T. (M. D.) (IV, 107)
- Photo: Garfunkel, Sol (III, 289)
- Photo: Garlock, Morgan B. (III, 307)
- Photo: Garlock, William D. (M. D.) (III, 271)
- Photo: Gordon, Harry S. (III, 710)
- Photo: Graves, James Wetherwax (M. D.) (III, 647)
- Photo: Greene, Nelson (I, inside front cover)
- Photo: Greenman, George H. (I, 197)
- Photo: Griffiths, Griffith (III, 191)
- Photo: Guernsey, James J. (III, 557)
- Photo: Harper, John R. (III, 785)
- Photo: Haselton, Jonathan Sawyer (III, 109)
- Photo: Hemstreet, John Van Kirk (D. D. S.) (III, 563)
- Painting: Herkimer, Nicholas (General) at the Battle of Oriskany (I, 791)
- Photo: Hieber, Eugene Albert (III, 223)
- Photo: Hieber, John Christian (III, 219)
- Photo: Hieber, Theodore William (III, 222)
- Photo: Howard, Harry (III, 539)
- Photo: Howell, William B. (III, 801)
- Photo: Hower, Leopold (III, 391)
- Photo: Hughes, William W. (III, 671)
- Photo: Hurley, Richard (IV, 149)
- Photo: Jenner, Harry A. (III, 209)
- Photo: Jewett, Charles A. (III, 253)
- Photo: Jones, Evan (Hon.) (III, 301)
- Photo: Jones, John H. (III, 581)
- Photo: Jones, Sheldon (III, 497)
- Photo: Kaiser, Anthony J. (III, 259)
- Photo: Kay, Cyrus (M. D.) (III, 185)
- Photo: Kellogg, George (IV, 59)
- Photo: Kellogg, John (IV, 77)
- Photo: Kellogg, Lauren (III, 265)
- Photo: King, Fred Blue (III, 403)
- Photo: Lester, Robert Barker (III, 357)
- Photo: Lewis, William Ebenezer (IV, 53)
- Photo: Liddle, James W. (III, 455)
- Photo: Liddy, John P. (III, 635)
- Photo: Lisle, David B. (III, 725)
- Photo: Littauer, Lucius Nathan (III, 479)
- Photo: Little, Andrew (III, 755)
- Photo: Little, Charles Warren (IV, 155)
- Photo: Livingston, Robert Francis (III, 241)
- Photo: McMahon, John Daniel (Hon.) (III, 139)
- Photo: McMullen, John (Hon.) (III, 749)
- Photo: Maider, Wesley H. (IV, 83)
- Photo: Martin, Fred L. (III, 731)
- Photo: Martin, John (III, 641)
- Photo: Martin, Louis Mayo (Hon.) (III, 203)
- Photo: Martin, William McLaughlin (IV, 101)
- Photo: Mills, W. Ellison (III, 203)
- Photo: Mills, William Curtis (III, 331)
- Photo: Morrison, John T. (IV, 119)
- Photo: Munger, Henry Gillette (IV, 35)
- Photo: O'Connor, Edmund A. (Rev.) (III, 337)
- Photo: Ogonowski, Mathew Stanley (III, 363)
- Photo: Olney, James P. (III, 169)
- Photo: Petrie, William H. (M. D.) (IV, 185)
- Photo: Philo, George E. (III, 761)
- Photo: Powell, William (M. D.) (III, 283)
- Photo: Prescott, William Cowan (III, 115)
- Photo: Prince, Willard H. (III, 127)
- Photo: Rathbone, Frank Matteson (III, 351)
- Photo: Robertaccio, Francesco (M. D.) (IV, 125)
- Photo: Roberts, Henry W. (IV, 197)
- Painting: Root, Elihu (Senator) (III, 4)
- Photo: Rushmer, Herbert D. (III, 521)
- Photo: Rutter, Frederick B. (IV, 167)
- Photo: Sawyer, Ralph William (D. M. D.) (III, 695)
- Photo: Scovill, Annie Dewhurst (III, 373)
- Photo: Scovill, James Van Horn (III, 372)
- Photo: Scripture, William Ellis (III, 121)
- Photo: Searles, George Walton (III, 247)
- Photo: Semo, Henry J. (III, 653)
- Photo: Sexton, Michael Henry (Hon.) (III, 229)
- Painting: Seymour, Horatio (Governor) (II, 1325)
- Photo: Sherman, Richard Updike (General) (III, 11)
- Photo: Sherman, Richard Willett (Hon.) (III, 17)
- Photo: Simpson, George Charles (IV, 131)
- Photo: Sinclair, Harry A. (D. D. S.) (III, 599)
- Photo: Skinner, George J. (III, 313)
- Photo: Small, Edward (III, 719)
- Photo: Smith, George Davis (III, 737)
- Photo: Smith, Louis C. (IV, 143)
- Photo: Southworth, Lotus N. (III, 473)
- Photo: Sperry, Thomas Alexander (IV, 113)
- Photo: Stanton, Elizabeth Cady (II, 1670)
- Photo: Steinmetz, Charles Proteus (IV, 5)
- Photo: Steinmetz, Charles Proteus in Edison and Steinmetz (II, 1585)
- Photo: Szypulski, Karol J. (III, 659)
- Photo: Taber, William Ira (III, 103)
- Photo: Talbot, Frank (Hon.) (IV, 47)
- Photo: Terry, Israel Newton (Rev.) (III, 139)
- Photo: Terry, Orrin (III, 743)
- Photo: Tharratt, Brinckerhoff C. (III, 271)
- Photo: Thomas, Arthur Baker (III, 177)
- Drawing: Thomas, Percy (III, 325)
- Photo: Thomas, Philip (III, 176)
- Painting: Throop, Enos T. (Governor) (II, 1309)
- Photo: Town, John Joseph (III, 145)
- Photo: Van Auken, Myron Wilbur (III, 155)
- Photo: Van Auken, Wilbur Rice (III, 154)
- Photo: Van Brocklin, William Seward (III, 235)
- Photo: Van Buren, Cornelius (Hon.) (IV, 6)
- Photo: Vedder, Nicholas Francis (IV, 19)
- Photo: Vickers, Harry William (M. D.) (III, 629)
- Photo: Von Dauber, William (III, 421)
- Photo: Wallin, Samuel (Hon.) (III, 211)
- Photo: Weaver, George M. (III, 163)
- Photo: Wellman, Walter Fanstone (III, 665)
- Photo: White, Richmond Lane (III, 795)
- Photo: Wild, John Bannister (III, 379)
- Painting: Willett, Marinus (Colonel) (II, 1051)
- Painting: Yates, Joseph C. (Governor) (II, 1193)
- Photo: Yerdon, William (III, 385)
- Photo: Young, Owen D. (IV, 9)