Total de pilots participants: 83 (33 a Indianapolis)
Total d’equips participants: 58 (28 a Indianapolis)
Debutants: tots (evidentment)
Última temporada: 17 (Walt Ader, Clemente Biondetti, Bill Cantrell, Joie Chitwood, Geoffrey Crossley, Myron Fohr, Joe Fry, David Hampshire, Cuth Harrison, Leslie Johnson, Bayliss Levrett, Eugène Martin, Nello Pagani, Alfredo Pián, Charles Pozzi, Dorino Serafini i Raymond Sommer)
Defuncions a la F1: 0
Defuncions en altres categories: 2 (Joe Fry i Raymond Sommer)
Defuncions no relacionades amb l’esport: 0
Retirats per lesions a la F1: 0
Retirats per lesions a la F1: 0
Retirats per lesions en altres categories: 0
Pilot més jove: Troy Ruttman, 20 anys i 85 dies, Indianapolis
Pilot més vell: Philippe Étancelin, 53 anys i 261 dies, Itàlia
| Entrant | Cotxe | Pneu. | Pilots |
| Alfa Romeo SpA | Alfa Romeo 158 Alfa Romeo 159 |
P | Giuseppe Farina Juan Manuel Fangio Luigi Fagioli Reg Parnell Consalvo Sanesi Piero Taruffi |
| Scuderia Ferrari | Ferrari 125 Ferrari 166-F2 Ferrari 275 Ferrari 375 |
P | Alberto Ascari Luigi Villoresi Raymond Sommer Dorino Serafini |
| Automobiles Talbot-Darracq |
Talbot-Lago T26C-DA Talbot-Lago T26C |
D | Yves Giraud-Cabantous Louis Rosier Philippe Étancelin Eugène Martin Pierre “Levegh” |
| Officine Alfieri Maserati | Maserati 4CLT-48 | P | Louis Chiron Franco Rol |
| Equipe Gordini | Simca-Gordini T15 | E | Robert Manzon Maurice Trintignant |
| Scuderia Ambrosiana | Maserati 4CLT-48 Maserati 4CL |
D | David Murray David Hampshire Reg Parnell |
| T. A. S. O. Mathieson | ERA E | D | Leslie Johnson |
| Peter Walker | ERA E | D | Peter Walker Tony Rolt |
| Cuth Harrison | ERA B | D | Cuth Harrison |
| Bob Gerard | ERA B ERA A |
D | Bob Gerard |
| Joe Fry | Maserati 4CL | D | Joe Fry Brian Shawe-Taylor |
| Ecurie Belge | Talbot-Lago T26C | D | Johnny Claes |
| Enrico Platé | Maserati 4CLT-48 Maserati 4CLT-50 |
P | Toulo de Graffenried Prince Bira |
| Joe Kelly | Alta GP | D | Joe Kelly |
| Geoffrey Crossley | Alta GP | D | Geoffrey Crossley |
| Scuderia Achille Varzi | Maserati 4CLT-48 Maserati 4CLT-50 Maserati 4CL |
P | Froilán González Alfredo Pián Nello Pagani Toni Branca |
| Horschell Racing Co. | Cooper T12-JAP | D | Harry Schell |
| Philippe Étancelin | Talbot-Lago T26C Talbot-Lago T26C-DA |
D | Philippe Étancelin Eugène Chaboud |
| Ecurie Rosier | Talbot-Lago T26C Talbot-Lago T26C-GS |
D | Louis Rosier Henri Louveau |
| Peter Whitehead | Ferrari 125 | D P |
Peter Whitehead |
| Scuderia Milano | Maserati 4CLT-50 Milano 1-Speluzzi Maserati 4CLT-50-Milano |
P | Felice Bonetto Franco Comotti |
| Ecurie Bleue | Talbot-Lago T26C | D | Harry Schell |
| Raymond Sommer | Talbot-Lago T26C Talbot-Lago T26C-GS |
D | Raymond Sommer |
| Ecurie Lutetia | Talbot-Lago T26C-DA | D | Eugène Chaboud |
| Antonio Branca | Maserati 4CL | P | Toni Branca |
| Charles Pozzi | Talbot-Lago T26C | D | Charles Pozzi Louis Rosier |
| Clemente Biondetti | Ferrari 166T-Jaguar | ? | Clemente Biondetti |
| Paul Pietsch | Maserati 4CLT-48 | P | Paul Pietsch |
| Guy Mairesse | Talbot-Lago T26C | D | Guy Mairesse |
| Pierre “Levegh” | Talbot-Lago T26C | D | Pierre “Levegh” |
| Kurtis Kraft Inc. | Kurtis Kraft 3000-Offy | F | Johnnie Parsons Fred Agabashian |
| Carl Marchese | Marchese-Offy | F | Myron Fohr |
| Lou Moore | Deidt-Offy Lesovsky-Offy Moore-Offy |
F | Bill Holland George Connor Lee Wallard Tony Bettenhausen |
| Charles Pritchard | Kurtis Kraft 2000-Offy | F | Walt Brown Mack Hellings |
| Paul Russo & Ray Nichels | Nichels-Offy | F | Paul Russo |
| Indianapolis Race Cars Inc. | Maserati 8CTF-Offy | F | Henry Banks Fred Agabashian |
| Ervin Wolfe | Kurtis Kraft 2000-Offy | F | Joie Chitwood Tony Bettenhausen |
| Murrell Belanger | Stevens-Offy | F | Duane Carter |
| R. A. Cott | Maserati 8CTF-Offy | F | Spider Webb |
| Pat Clancy | Ewing-Offy | F | Jimmy Davies |
| Milt Marion | Kurtis Kraft-Offy | F | Sam Hanks |
| Sampson Manufacturing Co. | Rae-Offy | F | Walt Ader |
| Howard Keck Co. | Deidt-Offy | F | Mauri Rose |
| A. J. Watson | Watson-Offy | F | Dick Rathmann |
| Jack B. Hinkle | Kurtis Kraft 3000-Offy | F | Jack McGrath |
| M. A. Walker | Kurtis Kraft 3000-Offy | F | Cecil Green |
| Bowes Racing Inc. | Lesovsky-Offy | F | Troy Ruttman |
| Grancor Auto Specialists | Kurtis Kraft 3000-Offy | F | Pat Flaherty |
| Cummins Engine Co. | Kurtis Kraft-Cummins | F | Jimmy Jackson |
| M. Pete Wales | Kurtis Kraft 2000-Offy | F | Johnny McDowell |
| Louis Rassey | Snowberger-Offy | F | Bill Schindler |
| Verlin Brown | Kurtis Kraft 2000-Offy | F | Duke Dinsmore |
| Joe Langley | Langley-Offy | F | Gene Hartley |
| John Lorenz | Wetteroth-Offy | F | Jim Rathmann |
| Norm Olson | Olson-Offy | F | Jackie Holmes |
| Ludson D. Morris | Kurtis Kraft 2000-Offy | F | Jerry Hoyt |
| J. C. Agajanian | Kurtis Kraft 2000-Offy | F | Walt Faulkner |
| Richard L. Palmer | Adams-Offy | F | Bayliss Levrett Bill Cantrell |