Illinois - Role: Building
| Poinsetta Apartments |
| Point School |
| Polish National Alliance Headquarters |
| Polish Roman Catholic Union of America |
| Polo Independent Order of Odd Fellows Lodge No. 197 |
| Pontiac Building |
| Pontiac City Hall and Fire Station |
| Pope Brace Company Building |
| Post House |
| Potter House |
| Power Farmstead |
| Prairie Dell Meetinghouse |
| Price-Prather House |
| Price/Wheeler House |
| Princeton Chapter House |
| Proctor Building |
| Proctor, John C., Recreation Center |
| Produce Terminal Cold Storage Company Building |
| Promontory Apartments |
| Public Service Building |
| Pulaski Park and Fieldhouse |
| Pulsifer, Edward, House |
| Pure Oil Station |
| Purple, George E., House |
| Putnam County Courthouse |
| Pyle-National Company Plant |
| Quigley Preparatory Seminary |
| Quinby, Ivory, House |
| Quinn Chapel of the A.M.E. Church |
| Ragdale |
| Railway Exchange Building |
| Ramova Theater |
| Ramsey, Charles N., and Herry E. Weese House |
| Randecker's Hardware Store |
| Ratcliff Inn |
| Raymond Park Apartments |
| Reagan's, Ronald, Boyhood Home |
| Reebie Moving and Storage Company |
| Reed, Mrs. Kersey Coates, House |
| Reef House |
| Rees, Harriet F., House |
| Rehnstrom, August and Margaretha, House |
| Reid House |
| Reid Murdoch Building |
| Reimbold, William J., House |
| Reliance Building |
| Reorganized Church of Jesus Christ of Latter Day Saints |
| Ricker, Nathan C., House |
| Ridge Boulevard Apartments |
| Ridge Grove |
| Ridge Historic District |
| Ridge Manor |
| Ridgewood |
| Rippon-Kinsella House |
| Ritzman, William, House |
| River Forest Historic District |
| Robertson, John, Jr., House |
| Roberts, William H., House |
| Robie, Frederick C., House |
| Robinson-Bonnett Inn |
| Robinson House |
| Robinson, J. L., General Store |
| Robinson-Stewart House |
| Robinwood |
| Roche, Martin-John Tait House |
| Rockford Brass Works |
| Rockford Elk's Lodge #64 |
| Rockford Gas Light & Coke Fitting and Meter Shops Building |
| Rockford Morning Star Building |
| Rockford Woman’s Club |
| Rock Island Depot and Freight House |
| Rock Island Lines Passenger Station |
| Rogers, Col. Matthew, Building |
| Rogers, Orson, House |
| Rohrbough, Calendar, House |
| Rollo Congregational United Church of Christ |
| Roloson, Robert, Houses |
| Rookery Building |
| Rookwood Apartments |
| Room 405, George Herbert Jones Laboratory, The University of Chicago |
| Roosevelt Junior High School |
| Root-Badger House |
| Ropp-Grabill House |
| Rosehill Cemetery Administration Building and Entry Gate |
| Rose Hotel |
| Rosenwald Apartment Building |
| Ross, Harvey Lee, House |
| Ross, Joseph, House |
| Rothschild, A. M., & Company Store |
| Royalton Hotel |
| Roycemore School |
| Royer, Joseph W., House and Ella Danely Cottage |
| Roytek, Richard, House |
| Rozek, Theodore, House |
| Rubens Rialto Square Theater |
| Ruebel Hotel |
| Rutherford, Dr. Hiram, House and Office |
| Rutter Store |
| Ryan Round Barn |
| Sala Apartment Building |
Data from United States Park Service and Wikidata
