(Car Appearance)
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 0 | Genie - Chevrolet | Hilton Racing Team | red (+silver) | HILTON Racing Team | Goodyear | | open | mid |
| 2 | McLaren Elva Mark II Oldsmobile | Bruce McLaren Motor Racing Ltd. | red (+yellow) | | | | open | mid |
| 3 | Lola T70 Mk.2 Ford s/c | Mecom Racing Team | metallic blue (+dark blue/white) | | | | open | mid |
| 3T | Lola T70 Mk.2 Ford | Mecom Racing Team | metallic blue (+dark blue/white) | | | | open | mid |
| 4 | McLaren Elva Mark IIB Ford | Bruce McLaren Motor Racing Ltd. | red (+white) | | | | open | mid |
| 5 | McLaren Elva Mark I Oldsmobile | Entin Bros. Racing Team | | | | Castrol | open | mid |
| 6 | Lola T70 Mk.2 Chevrolet | Roger Penske Racing Enterprises | blue | | | | open | mid |
| 8 | Lola T70 Ford | All American Raceways | dark blue (+light blue) | | | | open | mid |
| 11 | McLaren Elva Mark II Oldsmobile | Lothar | silver | | Goodyear | Valvoline | open | mid |
| 12 | Chevrolet Corvette Grand Sport | Wintersteen Racing Inc. | white (+blue) | | | | open | front |
| 13 | Shelby Cobra Ford | Tom Payne | red (+white/blue) | | | | - | front |
| 14 | Lotus 23B | CHEC Radio Station | | | | | open | mid |
| 17 | Porsche 906 | Porsche North America | white (+blue) | ROBERT BOSCH | Goodyear | Valvoline | closed | mid |
| 33 | Porsche 906 | Precision Motor Cars | white | | Goodyear | | closed | mid |
| 39 | McLaren Elva Mark II Ford | Scuderia Lynx | red | RED-X | | | open | mid |
| 44 | Porsche 906 | Precision Motor Cars | | | | | closed | mid |
| 45 | Porsche 906 | Herb Wetanson | | | | | - | mid |
| 52 | Genie Mk X Ford | Eve & Jones Racing | cream (+orange) | | | | open | mid |
| 57 | McLaren Elva Mark I Oldsmobile | David G. Billes | | | | | open | mid |
| 62 | Genie - Chevrolet | Blocker Motor Racing | light green | NICKEY | | | open | mid |
| 77 | McKee Mk.6 Chevrolet | Honda of Waukegan | | | | | open | mid |
| 88 | Chinook | | white | | | | open | - |
| 95 | Ford GT40 | Comstock Racing Team | white (+silver/black) | Ford | | | closed | mid |
| 97 | McLaren Elva Mark II Chevrolet | Charles Hayes Racing | white (+blue/red) | NICKEY | Goodyear | Valvoline | open | mid |
| 111 | Ford GT40 | William W. Wonder Inc. | deep red | | | | closed | mid |
| 113 | Lotus 23B | Eitel Maier | | | | | open | mid |
| 169 | Cooper Monaco T61 Ford | Veedol Racing Team | | | | | open | mid |
| McLaren Elva | - | | | | | - | mid |
Entered cars that did not arrive:
| No. | Car | Entrant | Colour | Sponsors | Tyres | Lubricant | Body | Engine |
| 9 | Lola T70 Chevrolet | Skip Hudson | silver | | | | open | mid |
| 15 | McKee Mk V Plymouth | Bob Montana | | | | | open | mid |
| 18 | Brabham BT8 | - | | | | | open | mid |
| 21 | Bobsy SR3 | M. R. J. Wyllie | | | | | - | - |
| 41 | Ring Free Special | Robert R. Brown | | | | | - | - |
| 45 | Porsche 718 RS 61 | Air Cool Machine Shop | | | | | - | mid |
| 61 | McLaren Elva Mark II Ford | Bud Morley | | | | | open | mid |
| 67 | Lola T70 Ford | Greenwich Automobiles | white (+red) | | | | open | mid |
| 71 | Elva Mk VIII BMW | Fred Opert Racing Enterprises | | | | | open | mid |
| 72 | Elva Mk VIII BMW | Fred Opert Racing Enterprises | | | | | open | mid |
| 73 | Elva Mk VIII BMW | Fred Opert Racing Enterprises | silver* | | | | open | mid |
| 96 | McLaren - Chevrolet | Mike Goth Racing | | | | | open | mid |
| 131 | Astur - Climax | G. M. MacDonald | | | | | - | - |
| 161 | Lola - BMW | Frank M. Salem | | | | | - | - |
| 172 | Lotus 23B | Seitz Bros. Racing | | | | | open | mid |
| 223 | Lotus 19 Climax | Vern Hacking | | | | | open | mid |
| 411 | Ferrari 250 LM | David Greenblatt | | | | | - | mid |
| Wolverine | Jerry Hansen | maroon | | | | open | mid |
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