(Car Appearance)
| No. | Car | Entrant | Colour | Body | Engine |
| 0 | Genie Mk X Chevrolet | Hilton Racing Team | red (+silver) | open | mid |
| 1 | Porsche 906 | Schroeder Imported Motor Corp. | | closed | mid |
| 3 | McLaren - Ford | | | open | mid |
| 4 | Porsche 906 | Brumos Porsche Corp. | white | closed | mid |
| 6 | Lola T70 Mk.2 Chevrolet | Roger Penske Racing Enterprises | blue | open | mid |
| 7 | Porsche 906 | Porsche Corp. of America | white | closed | mid |
| 8 | Lola T70 Ford | All American Racers | dark blue (+light blue) | open | mid |
| 9 | Lola T70 Chevrolet | T. M. I. Associates | silver | open | mid |
| 12 | Chevrolet Corvette Grand Sport | Wintersteen Racing, Inc. | | open | front |
| 15 | Porsche 906 | Herb Wetanson | | - | mid |
| 17 | McLaren Elva Mark II Oldsmobile | Lothar Motschenbacher | | open | mid |
| 19 | Elva Mk VII Ford | Dr. E. C. Hessert | | open | mid |
| 23 | Lotus 23 Climax | Douglas Revson | | open | mid |
| 26 | Lola T70 Mk.2 Chevrolet | Raceway Engineering, Inc. | metallic blue (+white) | open | mid |
| 29 | Lola T70 Mk.2 Ford | Young B.A.R.F. Racing Team, Inc. | white (+blue) | open | mid |
| 31 | Genie Mk VIII Chevrolet | Don R. Skogmo | | open | mid |
| 33 | Porsche 906 | | | closed | mid |
| 41 | Denmacher II | Suburban Racing Team | | - | - |
| 42 | Lotus - Climax | Candido DaMota | | open | mid |
| 46 | Lotus 23 Porsche | | | open | mid |
| 48 | Brabham BT8 Climax | | | open | mid |
| 52 | Genie Mk X Ford | Eve & Jones Racing | | open | mid |
| 56 | Porsche 906 | | | closed | mid |
| 57 | Elva Mk VII S BMW | Suzy Dietrich | | open | mid |
| 62 | Genie Mk X Oldsmobile | Dan Blocker Motor Racing, Inc. | green | open | mid |
| 64 | Cooper - Chevrolet | Auto World | white (+red) | open | mid |
| 65 | Hamill SR3 Oldsmobile | Hamill Cars, Inc. | white (+blue) | open | mid |
| 75 | McKee Mk V Plymouth | Bob Montana | | open | mid |
| 77 | McKee Mk.6 Chevrolet | Honda of Waukegan | white | open | mid |
| 81 | Chevrolet Corvette | Alvin M. Forsyth | | - | front |
| 87 | Porsche 906 | William S. Bowman | | closed | mid |
| 88 | Shelby Cobra Ford | Archway Ford, Inc. | | - | front |
| 95 | Ford GT40 | Comstock Racing Team | beige (+black) | closed | mid |
| 96 | McLaren Elva Mark IB Chevrolet | Mike Goth Racing | | open | mid |
| Porsche 906 | | | closed | mid |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Body | Engine |
| 11 | Piranha | Charles R. Sarle | | - | - |
| 14 | Elva - BMW | Robert J. Nagel | | open | mid |
| 39 | McLaren Elva Mark II Chevrolet | Charles Cox | red | open | mid |
| 44 | Wolverine | Jerry Hansen | maroon | open | mid |
| 45 | McLaren Elva Mark I | James A. Linen, IV | | - | - |
| 47 | Lola T70 Mk.2 Chevrolet | Robert R. Brown | metallic blue | open | mid |
| 69 | N & B Special | N & B Automotive | | - | - |
| 72 | Elva Mk VIII BMW | Fred Opert Racing Enterprises | | open | mid |
| 73 | Elva Mk VIII BMW | Fred Opert Racing Enterprises | silver* | open | mid |
| 92 | Bobsy SR3 | Ecurie Oh!! Good Grief | | - | - |
| 97 | McLaren Elva Mark II Chevrolet | Charles Hayes Racing | | open | mid |
| 99 | Lotus 19G | Steve Diulo | | open | mid |
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