(Entry List)
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine |
| 0 | Milt Minter | Vasek Polak Racing, Inc. (USA) | | Porsche | 917/10 | | Porsche |
| 1 | Jackie Oliver | Don Nichols (USA) | Don Nichols | Shadow | Mk III | | Chevrolet |
| 2 | Gregg Young | Young American Racing (USA) | | McLaren | M8F | | Chevrolet |
| 4 | Peter Revson | McLaren Cars/Boyd Jefferies (GB) | | McLaren | M20 | | Chevrolet |
| 5 | Denny Hulme | McLaren Cars/Boyd Jefferies (GB) | | McLaren | M20 | | Chevrolet |
| 6 | Mark Donohue | Roger Penske Enterprises, Inc. (USA) | | Porsche | 917/10 | TC | Porsche |
| 7 | Mark Donohue | Roger Penske Enterprises, Inc. (USA) | Roger Penske | Porsche | 917/10 | | Porsche |
| 9 | John Cordts | William Overhauser Racing Ltd. (USA) | Bill Overhauser | Lola | T160 | /163 | Chevrolet |
| 11 | Lothar Motschenbacher | Motschenbacher Racing Ent. (USA) | Lothar Motschenbacher | McLaren | M8D | | Chevrolet |
| 13 | James Place | Place Motor Supply (USA) | James Place | Lola | T160 | | Chevrolet |
| 15 | William Wonder | Bill Wonder (USA) | William Wonder | McLaren | M8C | | Chevrolet |
| 17 | Bob Nagel | Nagel Racing (USA) | Bob Nagel | Lola | T222 | | Chevrolet |
| 23 | Charlie Kemp | Rinzler Motoracing/Holiday Inns (USA) | Bobby Rinzler | Lola | T222 | | Chevrolet |
| 39 | Rainer Brezinka | Videopack Toronto (CDN) | | Porsche | 910 | | Porsche |
| 41 | Jim Butcher | Jim Butcher Racing (USA) | Jim Butcher | Lola | T163 | /165 | Chevrolet |
| 50 | Gordon Dewar | JNO Racing Ent. Ltd. (CDN) | | McLaren | M8C | /D | Chevrolet |
| 55 | Roger McCaig | Roger McCaig Racing (CDN) | | McLaren | M8F | | Chevrolet |
| 59 | Peter Gregg | Brumos Porsche Audi Corp. (USA) | | Porsche | 917/10 | | Porsche |
| 77 | Bob Klempel | R. D. Klempel (USA) | | McLaren | Elva Mark III | | Chevrolet |
| 81 | Dick Durant | Racing Associates, Inc. (USA) | Dick Durant | Lola | T163 | | Chevrolet |
| 96 | Steve Durst | The March Company (USA) | | McLaren | M8E | /D | Chevrolet |
Entered cars that did not arrive:
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine |
| 3 | Bob Brown | Bob Brown Racing, Inc. (USA) | | McLaren | M8E | | Chevrolet |
| 29 | Howden Ganley | BRM Ltd. (GB) | | BRM | P167 | | Chevrolet |
| 30 | Frank Kahlich | Midwest Racing (USA) | | McLaren | M12 | | Chevrolet |
| 33 | Scooter Patrick | Otto Zipper Racing Team (USA) | | Alfa Romeo | T33/4 | | Alfa Romeo |
| 34 | George Drolsom | Warren Burmester (USA) | Warren Burmester | McLaren | M8C | | Chevrolet |
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