(Entry List)
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine |
| 1 | Sam Posey | Autodynamics Corporation (USA) | | Caldwell | D7 | | Chevrolet |
| 2 | Brett Lunger | Autodynamics Corporation (USA) | | McLaren | Elva Mark II | | Chevrolet |
| 4 | Bruce McLaren | McLaren Cars Limited (GB) | Bruce McLaren | McLaren | M6A | | Chevrolet |
| 5 | Denny Hulme | McLaren Cars Limited (GB) | | McLaren | M6A | | Chevrolet |
| 6 | Mark Donohue | Roger Penske Racing Ent. (USA) | Roger Penske | Lola | T70 | Mk.3B | Chevrolet |
| 7 | John Surtees | Team Surtees Limited (GB) | John Surtees | Lola | T70 | Mk.3B | Chevrolet |
| 10 | Scooter Patrick | Jack Nethercutt (USA) | Jack Nethercutt | Mirage | Mark I | B | Chevrolet |
| 11 | Lothar Motschenbacher | Peyton A. Cramer, Dana Chevrolet (USA) | Peyton A. Cramer | Lola | T70 | Mk.3 | Chevrolet |
| 12 | Roger McCluskey | Pacesetter Homes (USA) | John Klug | Lola | T70 | Mk.2 | Chevrolet |
| 13 | Bud Morley | Morley Racing Team (USA) | | McLaren | Elva Mark II | | Chevrolet |
| 14 | Skip Barber | Skip Barber (USA) | | McLaren | Elva Mark II | | Chevrolet |
| 15 | Frank Matich | Frank Matich Pty. Ltd. (AUS) | | Matich | SR3 | R | Repco |
| 16 | George Follmer | Roger Penske Racing Ent. (USA) | Roger Penske | Lola | T70 | Mk.2 | Chevrolet |
| 17 | Mario Andretti | Paul Newman/Holman & Moody, Inc. (USA) | | Honker | II | | Ford |
| 21 | Hugh Powell | Smothers Bros. Racing Team (USA) | | Lola | T70 | Mk.1 | Chevrolet |
| 22 | Mike Spence | Ecurie Soucy Racing Team (CDN) | | McLaren | Elva Mark II | B | Chevrolet |
| 24 | Bob Nagel | Robert J. Nagel (USA) | Robert J. Nagel | McKee | Mk.7 | | Chevrolet |
| 25 | Charlie Hayes | Ralph Salyer (USA) | Ralph Salyer | McKee | Mk.7 | | Oldsmobile |
| 26 | Chuck Parsons | Carl Haas Automotile Imports, Inc. (USA) | Carl A. Haas | McLaren | Elva Mark III | | Chevrolet |
| 27 | George Alderman | (USA) | George Alderman | McLaren | Elva Mark II | | Chevrolet |
| 28 | Dick Brown | Ecurie Greene, Inc. (USA) | | McLaren | Elva Mark II | | Ford |
| 32 | Ludovico Scarfiotti | North American Racing Team (USA) | Luigi Chinetti | Ferrari | 412 P | Spyder | Ferrari |
| 36 | Dan Gurney | All American Racers, Inc. (USA) | Dan Gurney | Lola | T70 | Mk.3B | Ford |
| 37 | Don Morin | Donald J. Morin (USA) | Donald J. Morin | McLaren | Elva Mark III | | Chevrolet |
| 39 | Ludwig Heimrath | Heimrath Racing (CDN) | | McLaren | Elva Mark II | B | Chevrolet |
| 52 | Peter Revson | Peyton A. Cramer, Dana Chevrolet (USA) | Peyton A. Cramer | Lola | T70 | Mk.3 | Chevrolet |
| 57 | John Cordts | David G. Billes (CDN) | David Billes | McLaren | Elva Mark III | | Chevrolet |
| 66 | Jim Hall | Chaparral Cars (USA) | | Chaparral | 2G | | Chevrolet |
| 76 | Bill Eve | Webster Racing Enterprises (USA) | Marvin Webster | Lola | T70 | Mk.3 | Chevrolet |
| 78 | Jerry Grant | Friedkin Ent., Thomas Friedkin (USA) | Thomas Friedkin | Lola | T70 | Mk.2 | Chevrolet |
| 79 | Ross Greenville | Greenville Racing (USA) | Ross Greenville | Lola | T70 | Mk.2 | Chevrolet |
| 91 | Skip Scott | Drummond Racing Organization (USA) | Ron Herrera | McLaren | Elva Mark III | | Chevrolet |
Entered cars that did not arrive:
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine |
| 43 | Don Brady | Donald E. Brady (USA) | | McKee | Mk V | A | Dodge |
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