Percival—Potter
- Percival, James Gates
- Perkins, Elisha
- Peter, Robert
- Peters, George A.
- Peters, John Charles
- Peterson, Robert Evans
- Phares, David Lewis
- Phelps, Charles
- Phelps, Edward Elisha
- Physick, Philip Syng
- Pickering, Charles
- Picton, John Moore White
- Piffard, Henry Granger
- Pilcher, James Evelyn
- Pilcher, Lewis Stephen, see Pilcher, Paul Monroe
- Pilcher, Paul Monroe
- Pinckney, Ninian
- Piper, Richard Upton
- Pitcher, Zina
- Plant, William Tomlinson
- Pollak, Simon
- Polk, William Mecklenburg
- Pomeroy, Charles G.
- Pomeroy, Oren Day
- Pope, Charles Alexander
- Pope, John Hunter
- Porcher, Francis Peyre
- Porter, Charles Burnham
- Porter, Charles Hogeboom
- Porter, James Burnham
- Porter, John Addison
- Porter, Joshua
- Porter, Robert Robinson
- Post, Alfred Charles
- Post, George Edward, see Post, Alfred Charles
- Post, Martin Hayward
- Post, Minturn
- Post, Philip Wright
- Pott, John
- Potter, Frank Hamilton
- Potter, Hazard Arnold
- Potter, Jared
- Potter, Nathaniel
- Potter, Samuel Otway Lewis
- Potter, William Warren
Potts—Rea
- Potts, Jonathan
- Powell, Seneca D.
- Powell, Theophilus Orgain
- Powell, William Byrd
- Power, William
- Pratt, Foster
- Prentiss, Daniel Webster
- Prescott, Albert Benjamin
- Prescott, Oliver
- Prescott, William
- Preston, Ann
- Preston, George Junkin
- Preston, Jonas
- Preston, Robert J.
- Prewitt, Theodore F.
- Price, Joseph
- Price, Mordecai
- Prime, Benjamin Young
- Prince, David
- Pryor, William Rice
- Pulte, Joseph Hippolyte
- Purple, Samuel Smith
- Putnam, Charles Gideon, see Putnam, Charles Pickering and Putnam, James Jackson
- Putnam, Charles Pickering
- Putnam, Israel
- Putnam, James Jackson
- Putnam, Mary, see Jacobi, Mary Putnam
- Putnam, Sumner
- Pynchon, Edwin
- Quinan, John Russell
- Raffeneau-Delile, Alyre
- Ramsay, Alexander
- Ramsay, David
- Rand, Benjamin Howard
- Rand, Isaac (1743–1822)
- Rand, Isaac (1769–1819), see Rand, Isaac (1743–1822)
- Randolph, Jacob
- Ranney, Ambrose Loomis
- Rauch, John Henry
- Ravenel, Edmund
- Ravenel, St. Julien
- Ray, Isaac
- Raymond, Joseph Howard
- Raymond-Schroeder, Aimée J.
- Rea, Robert Laughlin
Reamy—Robinson
- Reamy, Thaddeus Asbury
- Reber, James Wendell
- Reddy, John
- Redman, John
- Reed, Walter
- Rees, William
- Reese, David Meredith
- Reese, John James
- Reeve, James Theodore
- Reid, David Boswell
- Reid, Peter, see Reid, David Boswell
- Reid, William W.
- Reiter, William Charles
- Reuling, George
- Revere, John
- Rex, George Abraham
- Reynolds, Dudley Sharpe
- Reynolds, Edward
- Rich, Hosea
- Richardson, Alonzo Blair
- Richardson, James Henry
- Richardson, Joseph Gibbons
- Richardson, Maurice Howe
- Richardson, Tobias Gibson
- Richardson, W. A., see Richardson, James Henry
- Richmond, John Lambert
- Ricketts, Howard Taylor
- Ricord, Alexander
- Ricord Family
- Ricord, Jean Baptiste
- Ricord, Philippe
- Riddell, John Leonard
- Ridgely, Frederick
- Riggs, John M.
- Riley, John Campbell
- Rives, Landon Cabell
- Robbins, James Watson
- Roberts, Algernon Sydney
- Roberts, Milton Josiah
- Roberts, William Currie
- Robertson, Andrew
- Robertson, Charles Archibald
- Robinson, Charles
- Robinson, Fred Byron
- Robinson, William Chaffee
Roby—Sarrazin
- Roby, Joseph
- Rochester, Thomas Fortesque
- Rockwell, William Hayden
- Rodgers, John Kearny
- Rodman, William Louis
- Roe, John Orlando
- Rogers, Arthur Curtis
- Rogers, Henry Raymond
- Rogers, James Blythe
- Rogers, John Coleman
- Rogers, Joseph Goodwin
- Rogers, Joseph H. D., see Rogers, Joseph Goodwin
- Rogers, Lewis
- Rogers, Patrick Kerr
- Rogers, Robert Empie
- Rogers, Stephen
- Rohé, George Henry
- Rolph, John
- Romayne, Nicholas
- Roosa, Daniel Bennett St. John
- Ross, George
- Ross, James, see Ross, James Frederick William
- Ross, James Frederick William
- Ross, Joseph Presley
- Rosse, Irving Collins
- Rotch, Thomas Morgan
- Rothrock, Abram
- Row, Elhanon Winchester
- Rowan, Walter Hawthorne
- Rowe, George Howard Malcolm
- Ruschenberger, William Samuel Waithman
- Rush, Benjamin
- Russ, John Denison
- Russell, John Wadhams
- Sachs, Theodore Bernard
- Sager, Abram
- St. John, Samuel
- Salisbury, James Henry
- Salisbury, Jerome Henry
- Salmon, Daniel Elmer
- Sands, Henry Berton
- Sargent, Fitzwilliam
- Sargent, Joseph
- Sargent, Lucius Manlius, see Sargent, Fitzwilliam
- Sarrazin, Michel S.