(Entry List)
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine |
| 0 | Milt Minter | Vasek Polak Racing (USA) | Vasek Polak | Porsche | 917 PA | | Porsche |
| 1 | Jackie Stewart | Carl Haas Racing (USA) | Carl A. Haas | Lola | T260 | | Chevrolet |
| 2 | George Follmer | Roy Woods Racing | Roy Woods | McLaren | M8D | | Chevrolet |
| 3 | Bob Brown | Bob Brown Racing (USA) | | McLaren | M8E | | Chevrolet |
| 5 | Denny Hulme | McLaren Cars Ltd. (GB) | | McLaren | M8F | | Chevrolet |
| 7 | Peter Revson | McLaren Cars Ltd. (GB) | | McLaren | M8F | | Chevrolet |
| 8 | Sam Posey | Roy Woods Racing (USA) | Roy Woods | McLaren | M8E | | Chevrolet |
| 9 | John Cordts | World Racing (USA) | Bill Overhauser | Lola | T160 | /163 | Chevrolet |
| 11 | Lothar Motschenbacher | Motschenbacher Racing (USA) | Lothar Motschenbacher | McLaren | M8D | | Chevrolet |
| 12 | Chuck Parsons | Motschenbacher Racing (USA) | | McLaren | M8E | /D | Chevrolet |
| 16 | Bill Cupp | William R. Cupp (USA) | William R. Cupp | Lola | T163 | | Chevrolet |
| 18 | Gary Wilson | Great Western (Champagne) (USA) | | McLaren | M12 | | Chevrolet |
| 22 | Marion Whittington | Gary Burke | | McLaren | Elva Mark III | | Chevrolet |
| 23 | Charlie Kemp | Charles Kemp | | McLaren | M8C | | Chevrolet |
| 24 | Dave Jordan | Vasek Polak (USA) | | Porsche | 908/02 | | Porsche |
| 25 | Jerry Hodges | Hodges Racing (USA) | | McKee | Hodges Mk.2 | | Chevrolet |
| 32 | Vic Nelli | Vic Nelli (USA) | Vic Nelli | Lola | T70 | Mk.3B | Chevrolet |
| 33 | Chuck McConnell | Ronald Stafford (USA) | | McLaren | M6B | | Chevrolet |
| 34 | George Drolsom | Warren Burmester (USA) | Warren Burmester | McLaren | M8C | | Chevrolet |
| 35 | Danny Hopkins | Hird Enterprises (USA) | | Lola | T160 | | Chevrolet |
| 38 | Howden Ganley | Sid Taylor Racing (GB) | | BRM | P167 | | Chevrolet |
| 41 | Jim Butcher | Jim Butcher (USA) | Jim Butcher | Lola | T163 | | Chevrolet |
| 42 | Steve Pfeifer | Ron Grable (USA) | | Lola | T160 | /163 | Chevrolet |
| 49 | David Hobbs | T-G Racing | | Ti-22 | Mk II | | Chevrolet |
| 54 | Tony Adamowicz | Auto World (USA) | Oscar Koveleski | McLaren | M8B | | Chevrolet |
| 55 | Roger McCaig | McCaig Racing (CDN) | Roger McCaig | McLaren | M8E | | Chevrolet |
| 66 | Stan Szarkowicz | Stan's Werkstatt (USA) | | McLaren | M12 | | Chevrolet |
| 76 | Jim Adams | Earle - Cord Racing (USA) | | Ferrari | 612 P | | Ferrari |
| 79 | Tom Dutton | Barrett Racing (USA) | Gordon Barrett | McLaren | M6B | | Chevrolet |
| 81 | Jay Hills | Jay Hills (USA) | | McLaren | M6B | | Chevrolet |
| 87 | Tony Dean | A. G. Dean (GB) | | Porsche | 908/02 | | Porsche |
| 88 | Hiroshi Kazato | Carl Haas Racing (USA) | | Lola | T222 | | Chevrolet |
| 101 | Jackie Oliver | Advanced Vehicle Systems (USA) | Don Nichols | Shadow | Mk II | | Chevrolet |
Entered cars that did not arrive:
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine |
| 43 | Skeeter McKitterick | | | McLaren | M6C | | Chevrolet |
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