(Entry List)
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine |
| 1 | Sam Posey | Autodynamics Corp. (USA) | | Caldwell | D7 | | Chevrolet |
| 4 | Bruce McLaren | McLaren Cars Ltd. (GB) | Bruce McLaren | McLaren | M6A | | Chevrolet |
| 5 | Denny Hulme | McLaren Cars Ltd. (GB) | | McLaren | M6A | | Chevrolet |
| 6 | Mark Donohue | Roger Penske Racing Ent. (USA) | Roger Penske | Lola | T70 | Mk.3B | Chevrolet |
| 7 | John Surtees | Team Surtees Ltd. (GB) | John Surtees | Lola | T70 | Mk.2 | Chevrolet |
| 11 | Lothar Motschenbacher | Peyton Cramer Dana Chev. (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 |
| 16 | George Follmer | Roger Penske Racing Ent. (USA) | Roger Penske | Lola | T70 | Mk.3 | Chevrolet |
| 17 | Mario Andretti | Holman & Moody, Inc. (USA) | | Honker | II | | Ford |
| 21 | Parnelli Jones | American Rubber Plastic Corp. (USA) | George Bignotti | Lola | T70 | Mk.3 | Ford |
| 22 | Mike Spence | Ecurie Soucy Racing Team (CDN) | | McLaren | Elva Mark II | B | Chevrolet |
| 23 | Chris Amon | Harrah's Club | Bill Harrah | Ferrari | 330 P4 | | Ferrari |
| 24 | Hugh Powell | Smothers Bros. Racing Team (USA) | | Lola | T70 | Mk.1 | Chevrolet |
| 25 | Charlie Hayes | Smothers Bros.-Ralph Salyer (USA) | Ralph Salyer | McKee | Mk.7 | | Oldsmobile |
| 26 | Chuck Parsons | Carl A. Haas Auto Imports, Inc. (USA) | Carl A. Haas | McLaren | Elva Mark III | | Chevrolet |
| 27 | Jonathan Williams | Harrah's Club | Bill Harrah | Ferrari | 350 P4 | | Ferrari |
| 29 | Jim Paul | James Paul (USA) | James Paul | McLaren | Elva Mark III | B | Chevrolet |
| 33 | John Cannon | Tero-Corvette, Ray Kamnick (CDN) | John Cannon | McLaren | Elva Mark II | B | Chevrolet |
| 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 |
| 38 | Ron Herrera | (USA) | | 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 |
| 46 | Rick Muther | J.A.P. Ent. (USA) | Rick Muther | Lola | T70 | Mk.3 | Chevrolet |
| 49 | Dennis Harrison | Miles Gupton (USA) | Miles Gupton | Platypus | | | Oldsmobile |
| 52 | Peter Revson | Peyton Cramer Dana Chev. (USA) | Peyton A. Cramer | Lola | T70 | Mk.3 | Chevrolet |
| 55 | Jerry Titus | Shelby Racing Co., Inc. (USA) | | King Cobra | | | Ford |
| 59 | Gary Wilson | Wilson Racing (USA) | | McLaren | Elva Mark II | | Chevrolet |
| 66 | Jim Hall | Chaparral Cars (USA) | | Chaparral | 2G | | Chevrolet |
| 77 | Tony Settember | Webster Racing Enterprises (USA) | | Matich | SR3 | | Oldsmobile |
| 78 | Jerry Grant | Friedkin Ent. (USA) | Thomas Friedkin | Lola | T70 | Mk.2 | Chevrolet |
| 89 | Bill Eve | Ecurie Vickie Racing Team (USA) | | Lotus | 19 | G | Ford |
| 91 | Skip Scott | Drummond Racing Organization (USA) | Ron Herrera | McLaren | Elva Mark III | | Chevrolet |
Entered cars that did not arrive:
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