| 1 | Miles / Morton / *Hill | Shelby American Corp. (USA) | | Shelby | Cobra | | Ford | P+3.0 |
| 2 | Foyt / Cannon | Mecom Racing Team (USA) | | Chevrolet | Corvette Grand Sport | | Chevrolet | P+3.0 |
| 3 | Johnson / Morgan | Johnson Chevrolet Co. (USA) | | Chevrolet | Corvette Grand Sport | | Chevrolet | P+3.0 |
| 4 | Penske / Hall | McKean Chevrolet, Inc. (USA) | | Chevrolet | Corvette Grand Sport | | Chevrolet | P+3.0 |
| 5 | Wilson / McLaughlin / Hugus | William McLaughlin (USA) | | Iso | Grifo A3C | | Chevrolet | P+3.0 |
| 6 | Robertson / Boo | George Robertson Jr./Richard Boo (USA) | | Chevrolet | Corvette Sting Ray | C2 | Chevrolet | GT+5.0 |
| 9 | Hudson / Grant | Nickey Chevrolet Co. (USA) | | Chevrolet | Corvette Sting Ray | C2 | Chevrolet | GT+5.0 |
| 10 | Holbert / MacDonald | Shelby American Corp. (USA) | | Shelby | Cobra Daytona Coupe | | Ford | GT5.0 |
| 11 | Gurney / Johnson | Shelby American Corp. (USA) | | Shelby | Cobra | roadster | Ford | GT5.0 |
| 12 | Bondurant / Spencer | Shelby American Corp. (USA) | | Shelby | Cobra | roadster | Ford | GT5.0 |
| 14 | Schlesser / Hill | Ford of France (F) | | Shelby | Cobra | roadster | Ford | GT5.0 |
| 15 | Hitchcock / Tchkotoua | Thomas Hitchcockm, Jr. (USA) | Tommy Hitchcock | Shelby | Cobra | roadster | Ford | GT5.0 |
| 16 | Noseda / Stevens | Ralph H. Noseda (USA) | | Shelby | Cobra | roadster | Ford | GT5.0 |
| 17 | Hayes / Shaw / *Lund | Graham Shaw (USA) | | Shelby | Cobra | roadster | Ford | GT5.0 |
| 18 | Lowther / Wintersteen | Ed Hugus (USA) | | Shelby | Cobra | roadster | Ford | GT5.0 |
| 19 | Gerber / Reed / *Lang | George Reed Jr. (USA) | Daniel Gerber | Shelby | Cobra | roadster | Ford | GT5.0 |
| 20 | Pabst / Hansgen | Mecom Racing Team (USA) | John Mecom | Lola | Mk.6 GT | | Chevrolet | P+3.0 |
| 21 | Surtees / Bandini / *Hutchinson | S.E.F.A.C.-Ferrari (I) | | Ferrari | 330 P | | Ferrari | P+3.0 |
| 22 | Parkes / Maglioli | S.E.F.A.C.-Ferrari (I) | | Ferrari | 275 P | | Ferrari | P+3.0 |
| 23 | Scarfiotti / Vaccarella | S.E.F.A.C.-Ferrari (I) | | Ferrari | 275 P | | Ferrari | P+3.0 |
| 24 | Hill / Bonnier | Maranello Concessionaires (GB) | | Ferrari | 330 P | | Ferrari | P+3.0 |
| 25 | Rodriguez / Fulp | N.A.R.T. (USA) | | Ferrari | 330 P | | Ferrari | P+3.0 |
| 26 | Pedro Rodriguez | N.A.R.T. (USA) | | Ferrari | 330 P | | Ferrari | P+3.0 |
| 27 | Kolb / Rainville | Fong Racing Associates (USA) | | Ferrari | 330 LMB | | Ferrari | P+3.0 |
| 28 | O'Brien / Kolb / Hutchinson | N.A.R.T. (USA) | | Ferrari | 250 LM | | Ferrari | P3.0 |
| 29 | Grossman / Thompson | N.A.R.T. (USA) | | Ferrari | 250 GTO | LMB | Ferrari | GT3.0 |
| 30 | Piper / Gammino / Rodriguez | N.A.R.T. (USA) | | Ferrari | 250 GTO | 64 | Ferrari | GT3.0 |
| 31 | Abate / Guichet | S.E.F.A.C.-Ferrari (I) | | Ferrari | 250 GTO | 64 | Ferrari | GT3.0 |
| 32 | Cantrell / Heuer / Yenko / *Gregg | Angels Aviation Racing Team (USA) | Ed Cantrell | Ferrari | 250 GTO | | Ferrari | GT3.0 |
| 33 | Hopkirk / Clark | Donald Healey Motor Co. (GB) | | Austin-Healey | 3000 | | BMC | GT3.0 |
| 34 | Waltman / Lawrence | Genser Forman Triumph Dist. (USA) | | Triumph | TR4 | | Triumph | GT2.5 |
| 35 | Rogers / Treuhaft / *Dour | Nuclear Electronic Lab. (USA) | | Morgan | 4/4 | | Triumph | GT2.5 |
| 36 | Ginther / Bucknum | Precision Motor Cars (USA) | Otto Zipper | Porsche | 904 | GTS | Porsche | P3.0 |
| 37 | Underwood / Cunningham | B. S. Cunningham (USA) | | Porsche | 904 | GTS | Porsche | P3.0 |
| 38 | Carel Godin de Beaufort | Count Godin de Beaufort (NL) | | Porsche | 904 | GTS | Porsche | P3.0 |
| 39 | Ryan / Bencker | John E. Ryan (USA) | | Porsche | 904 | GTS | Porsche | P3.0 |
| 40 | Sharp / Hissom | Hap Sharp (USA) | | Porsche | 904 | GTS | Porsche | P3.0 |
| 41 | Barth / Linge | Porsche System Engineering (D) | | Porsche | 718 WRS | | Porsche | P3.0 |
| 42 | Wester / Jennings | Porsche System Engineering (D) | | Porsche | 356 | B 2000 GS Carrera GT | Porsche | P3.0 |
| 43 | Pon / Buzzetta | Porsche System Engineering (D) | | Porsche | 356 | B 2000 GS Carrera GT | Porsche | GT2.0 |
| 44 | Merino / Torruellas | Porsche Car Import (USA) | | Porsche | 356 | B 2000 GS Carrera Abarth GTL | Porsche | GT2.0 |
| 45 | Cassel / Sesslar | Carl W. Lindell (USA) | | Porsche | 356 | B 2000 GS Carrera Abarth GTL | Porsche | GT2.0 |
| 46 | Parkinson / Flaherty | Kjelle Qvale (USA) | | MG | B | | BMC | GT2.0 |
| 47 | Leslie / Dalton | Kjelle Qvale (USA) | | MG | B | | BMC | GT2.0 |
| 48 | Adams / Brennan | Kjelle Qvale (USA) | Kjell Qvale | MG | B | | BMC | GT2.0 |
| 49 | Tattersall / Engelin | Volvo Imports, Inc. (USA) | | Volvo | P1800 | | Volvo | P3.0 |
| 50 | Jordan / Christy | Volvo Imports, Inc. (USA) | | Volvo | P1800 | | Volvo | P3.0 |
| 51 | Riley / Cone | Volvo Imports, Inc. (USA) | | Volvo | P1800 | A | Volvo | P3.0 |
| 52 | Bentley / Witmer / *Ward | Kenneth Chambliss (USA) | Kenneth Chambliss | Porsche | 356 | B 1600 GS Carrera Abarth GTL | Porsche | GT1.6 |
| 53 | Kaser / Stoddard | Scuderia Sant Ambroeus (I) | | Alfa Romeo | Giulia TZ | | Alfa Romeo | GT1.6 |
| 54 | Dietrich / Wuesthoff | Scuderia Sant Ambroeus (I) | | Alfa Romeo | Giulia TZ | | Alfa Romeo | GT1.6 |
| 55 | Bussinello / Biscaldi / Sanesi / *Bulgari | Scuderia Sant Ambroeus (I) | | Alfa Romeo | Giulia TZ | | Alfa Romeo | GT1.6 |
| 56 | Theodoli / Sanesi / Bulgari | Scuderia Sant Ambroeus (I) | | Alfa Romeo | Giulia TZ | | Alfa Romeo | GT1.6 |
| 57 | Dibley / Rossler | Stirling Moss Auto Racing Team (GB) | Stirling Moss | Lotus | Elan | | Ford | GT1.6 |
| 59 | Clark / Parsons / *Chapman | Robert Scott Jr. (USA) | | Ford | Cortina Lotus | | Ford | GT1.6 |
| 61 | Colgate / Baker | Donald Healey Motor Co. (GB) | | Austin-Healey | Sprite | | BMC | P3.0 |
| 62 | Fleming / Linton / Diaz | Ray Heppenstall (USA) | | Abarth-Simca | 1300 | Bialbero | Abarth | GT1.3 |
| 63 | McKelvy / Holquist | Scuderia Bear (USA) | William McKelvy | Abarth-Simca | 1300 | Bialbero | Abarth | GT1.3 |
| 64 | Kearney / Franklin | Donald F. Kearney (USA) | | Triumph | Spitfire | | Triumph | GT1.3 |
| 65 | Hanna / Toland | Automobiles René Bonnet (F) | | René Bonnet | Djet 2 | | Renault | GT1.3 |
| 67 | Pease / Mims | Donald Healey Motor Co. (GB) | Donald Healey | Austin-Healey | Sprite | Mk I | BMC | GT1.3 |
| 68 | Bianchi / Rosinski | Automobiles Alpine (F) | | Alpine | M63 | | Renault | P3.0 |
| 69 | Richards / Rainville / *Haenelt / *Stiller | Autosport International (USA) | | Alpine | M63 | | Renault | P3.0 |
| 70 | Cuomo / Tullius / *Gilmartin / *Maggiacomo | Autosport International (USA) | | Alpine | M63 | | Renault | P3.0 |
| 80 | Keck / Scott / *Wintersteen | Hellerton Motors (USA) | | Shelby | Cobra | roadster | Ford | GT5.0 |
| 82 | Eve / Perkins | Larry Perkins (USA) | Larry Perkins | Ferrari | 250 GTO | | Ferrari | GT3.0 |
| 84 | Davis / Layman / *Pulver | Duchess Auto Co. (USA) | | Lotus | Elite | | Climax | GT1.3 |
| 85 | Haenelt / Norwood / *Mayfield | Autosport International (USA) | | Alpine | A110 | | Renault | GT1.3 |