(Entry List)
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine |
| 1 | Sam Posey | Autodynamics Corp. (USA) | Ray Caldwell | Caldwell | D7 | | Chevrolet |
| 2 | Brett Lunger | Autodynamics Corp. (USA) | Ray Caldwell | McLaren | Elva Mark II | | Chevrolet |
| 4 | Bruce McLaren | McLaren Cars, Ltd. (GB) | Bruce McLaren | McLaren | M6A | | Chevrolet |
| 5 | Denny Hulme | McLaren Cars, Ltd. (GB) | Bruce McLaren | McLaren | M6A | | Chevrolet |
| 6 | Mark Donohue | Roger Penske Racing (USA) | Roger Penske | Lola | T70 | Mk.3B | Chevrolet |
| 7 | John Surtees | Team Surtees Ltd. (GB) | John Surtees | Lola | T70 | Mk.3B | Chevrolet |
| 10 | Scooter Patrick | Jack Nethercutt (USA) | Jack Nethercutt | Mirage | Mark I | B | Chevrolet |
| 11 | Lothar Motschenbacher | Dana Chevrolet (USA) | Peyton A. Cramer | Lola | T70 | Mk.3 | Chevrolet |
| 12 | Roger McCluskey | Pacesetter Homes (USA) | John Klug | Lola | T70 | Mk.2 | Chevrolet |
| 14 | Bud Morley | Morley Racing Team (USA) | Bud Morley | Lola | T70 | Mk.3 | Chevrolet |
| 15 | Frank Matich | Frank Matich Pty. Ltd. (AUS) | | Matich | SR3 | R | Repco |
| 16 | George Follmer | Roger Penske Racing (USA) | Roger Penske | Lola | T70 | Mk.3 | Chevrolet |
| 17 | Merle Brennan | Merle Brennan Auto (USA) | Merle Brennan | Genie | Mk X | | Chevrolet |
| 19 | Bill Amick | Dick Niles Mercury (USA) | | McLaren | Elva Mark III | | Chevrolet |
| 21 | Parnelli Jones | George Bignotti (USA) | George Bignotti | Lola | T70 | Mk.3 | Ford |
| 22 | Mike Spence | Ecurie Soucy (CDN) | | McLaren | Elva Mark II | B | Chevrolet |
| 23 | Chris Amon | Harrah's Club (USA) | Bill Harrah | Ferrari | 330 P4 | | Ferrari |
| 24 | Hugh Powell | Smothers Bros. Racing (USA) | | Lola | T70 | Mk.1 | Chevrolet |
| 25 | Charlie Hayes | Smothers Bros. Racing (USA) | Ralph Salyer | McKee | Mk.7 | | Oldsmobile |
| 26 | Chuck Parsons | Carl Haas Automotive (USA) | Carl A. Haas | McLaren | Elva Mark III | | Chevrolet |
| 27 | Jonathan Williams | Harrah's Club (USA) | Bill Harrah | Ferrari | 350 P4 | | Ferrari |
| 33 | John Cannon | Huw Morgan/Team Cannon (CDN) | John Cannon | McLaren | Elva Mark II | B | Chevrolet |
| 36 | Dan Gurney | All American Racers (USA) | Dan Gurney | Lola | T70 | Mk.3B | Ford |
| 37 | Don Morin | Don Morin (USA) | Donald J. Morin | McLaren | Elva Mark III | | Chevrolet |
| 39 | Jim Adams | Hollywood Sports Cars (USA) | Chris Vandagriff | McLaren | Elva Mark II | | Chevrolet |
| 43 | Ross Greenville | Greenville Racing (USA) | Ross Greenville | Lola | T70 | Mk.3 | Chevrolet |
| 45 | Jerry Entin | Entin Bros. Racing (USA) | | McLaren | Elva Mark II | | Chevrolet |
| 49 | Miles Gupton | Miles Gupton (USA) | | Platypus | | | Oldsmobile |
| 52 | Peter Revson | Dana Chevrolet (USA) | Peyton A. Cramer | Lola | T70 | Mk.3 | Chevrolet |
| 66 | Jim Hall | Chaparral Cars (USA) | | Chaparral | 2G | | Chevrolet |
| 67 | Tom Tobin | Tom Tobin (USA) | Tom Tobin | Brabham | BT8 | | Oldsmobile |
| 75 | Tony Settember | Webster Racing Ent. (USA) | Marvin Webster | Lola | T70 | Mk.3 | Chevrolet |
| 76 | Bill Eve | Webster Racing Ent. (USA) | Marvin Webster | Lola | T70 | Mk.3 | Chevrolet |
| 77 | Tony Settember | Webster Racing Ent. (USA) | Marvin Webster | Matich | SR3 | | Repco |
| 78 | Jerry Grant | Tom Friedkin (USA) | Thomas Friedkin | Lola | T70 | Mk.2 | Chevrolet |
| 89 | Bobby Unser | Ecurie Vickie Racing (USA) | | Lotus | 19 | G | Ford |
| 91 | Skip Scott | Drummond Racing Org. (USA) | Ron Herrera | McLaren | Elva Mark III | | Chevrolet |
Entered cars that did not arrive:
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine |
| 55 | Jerry Titus | Shelby Racing Co., Inc. (USA) | | King Cobra | | | Ford |
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