(Entry List)
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine | Gr. |
| 0 | Chuck Parsons | Hilton Racing Team (USA) | Randy HIlton | Genie | Mk X | | Chevrolet | O2L |
| 1 | Charlie Kolb | Schroeder Imported Motor Corp. | | Porsche | 906 | | Porsche | U2L |
| 3 | Ludwig Heimrath | (CDN) | | McLaren | Elva Mark II | | Ford | O2L |
| 4 | Peter Gregg | Brumos Porsche Corp. | | Porsche | 906 | | Porsche | U2L |
| 6 | Mark Donohue | Roger Penske Racing Enterprises (USA) | Roger Penske | Lola | T70 | Mk.2 | Chevrolet | O2L |
| 7 | Joe Buzzetta | Porsche Corp. of America (USA) | | Porsche | 906 | | Porsche | U2L |
| 8 | Jerry Grant | All American Racers (USA) | Dan Gurney | Lola | T70 | Mk.1 | Ford | O2L |
| 9 | Skip Hudson | T. M. I. Associates (USA) | Chuck Jones | Lola | T70 | Mk.1 | Chevrolet | O2L |
| 12 | George Wintersteen | Wintersteen Racing, Inc. (USA) | George Wintersteen | Chevrolet | Corvette Grand Sport | | Chevrolet | O2L |
| 15 | Herb Wetanson | Herb Wetanson (USA) | Herb Wetanson | Porsche | 906 | | Porsche | U2L |
| 17 | Lothar Motschenbacher | Lothar Motschenbacher (USA) | Lothar Motschenbacher | McLaren | Elva Mark II | | Oldsmobile | O2L |
| 19 | Ed Hessert | Dr. E. C. Hessert | | Elva | Mk VII | | Ford | U2L |
| 23 | Doug Revson | Douglas Revson (USA) | | Lotus | 23 | B | Climax | U2L |
| 26 | John Fulp | Raceway Engineering, Inc. (USA) | John Fulp | Lola | T70 | Mk.2 | Chevrolet | O2L |
| 29 | Bob Bucher | Young B.A.R.F. Racing Team, Inc. (USA) | Woody Young | Lola | T70 | Mk.2 | Ford | O2L |
| 31 | Don Skogmo | Don R. Skogmo (USA) | Don Skogmo | Genie | Mk VIII | | Chevrolet | O2L |
| 33 | Scooter Patrick | | | Porsche | 906 | | Porsche | U2L |
| 41 | John Dennis | Suburban Racing Team (USA) | | Denmacher | II | | Porsche | U2L |
| 42 | Candido DaMota | Candido DaMota | | Lotus | 23 | | Climax | U2L |
| 46 | John Morton | (USA) | John Morton | Lotus | 23 | | Porsche | U2L |
| 48 | Skip Barber | | | Brabham | BT8 | | Climax | U2L |
| 52 | Bill Eve | Eve & Jones Racing (USA) | Bill Eve & Earl Jones | Genie | Mk X | | Ford | O2L |
| 56 | Ralph Trieschmann | (USA) | Ralph Trieschmann | Porsche | 906 | | Porsche | U2L |
| 57 | Chuck Dietrich | Suzy Dietrich (USA) | | Elva | Mk VII | S | BMW | U2L |
| 62 | John Cannon | Dan Blocker Motor Racing, Inc. | Dan Blocker | Genie | Mk X | B | Oldsmobile | O2L |
| 64 | Oscar Koveleski | Auto World | | Cooper | Monaco | T61M | Chevrolet | O2L |
| 65 | Ed Hamill | Hamill Cars, Inc. (USA) | | Hamill | SR3 | | Oldsmobile | O2L |
| 75 | Bob Montana | Bob Montana (USA) | | McKee | Mk V | | Plymouth | O2L |
| 77 | Mak Kronn | Honda of Waukegan | John W. Fritsch | McKee | Mk.6 | | Chevrolet | O2L |
| 81 | Alvin Forsyth | Alvin M. Forsyth (USA) | | Chevrolet | Corvette Sting Ray | C2 | Chevrolet | O2L |
| 87 | Bill Bowman | William S. Bowman | | Porsche | 906 | | Porsche | U2L |
| 88 | Harold Keck | Archway Ford, Inc. | | Shelby | Cobra | | Ford | O2L |
| 95 | Eppie Wietzes | Comstock Racing Team (CDN) | | Ford | GT40 | | Ford | O2L |
| 96 | Mike Goth | Mike Goth Racing (USA) | Mike Goth | McLaren | Elva Mark I | B | Chevrolet | O2L |
| Ken Miles | (USA) | | Porsche | 906 | | Porsche | U2L |
Entered cars that did not arrive:
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine | Gr. |
| 11 | Chuck Sarle | Charles R. Sarle (USA) | | Piranha | | | | O2L |
| 14 | Bob Nagel | Robert J. Nagel (USA) | | Elva | Mk VIII | | BMW | U2L |
| 39 | Charles Cox | Charles Cox (USA) | | McLaren | Elva Mark II | | Chevrolet | O2L |
| 44 | Jerry Hansen | Jerry Hansen (USA) | Jerry Hansen | Wolverine | LD65 | | Chevrolet | O2L |
| 45 | Rick Muther | James A. Linen, IV (USA) | | McLaren | Elva Mark I | | | O2L |
| 47 | Bob Brown | Robert R. Brown (USA) | Robert Brown | Lola | T70 | Mk.2 | Chevrolet | O2L |
| 69 | John Keane | N & B Automotive | | N & B | Special | | | O2L |
| 72 | George Ralph | Fred Opert Racing Enterprises (USA) | | Elva | Mk VIII | | BMW | U2L |
| 73 | Fred Ashplant | Fred Opert Racing Enterprises (USA) | Fred Ashplant | Elva | Mk VIII | | BMW | U2L |
| 92 | Chuck Akins | Ecurie Oh!! Good Grief (USA) | | Bobsy | SR3 | | Porsche | U2L |
| 97 | Charlie Hayes | Charles Hayes Racing (USA) | Charles Hayes | McLaren | Elva Mark II | | Chevrolet | O2L |
| 99 | Steve Diulo | Steve Diulo (USA) | | Lotus | 19 | G | Ford | O2L |
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