| 2 | Kaffer / Herbert | ADT/Champion Racing (USA) | Dave Maraj | Audi | R8 | | Audi | LMP1 |
| 3 | Fellows / O'Connell / Papis | Corvette Racing (USA) | Doug Fehan | Chevrolet | Corvette C5 | -R | Chevrolet | GTS |
| 4 | Gavin / Beretta / Magnussen | Corvette Racing (USA) | Doug Fehan | Chevrolet | Corvette C5 | -R | Chevrolet | GTS |
| 5 | Kox / Brabham / Jönsson | Krohn Barbour Racing (USA) | Tracy Krohn/Dick Barbour | Lamborghini | Murciélago | R-GT | Lamborghini | GTS |
| 6 | Maxwell / Krohn / Fox | Krohn Barbour Racing (USA) | Tracy Krohn/Dick Barbour | Lamborghini | Murciélago | R-GT | Lamborghini | GTS |
| 7 | Workman / Devlin / Grupp | Marshall Cooke Racing (USA) | Dennis Marshall/James Cook | Lola | B2K/40 | | Ford | LMP2 |
| 8 | Davis / Cawley / Espenlaub | Foxhill Racing/Comprent Motor Sports (USA) | Michael Cawley | Porsche | 996 GT3-RS | | Porsche | GT |
| 10 | James / Gue / *Macaluso | Miracle Motorsports (USA) | John Macaluso | Courage | C65 | | AER | LMP2 |
| 12 | Lewis / *Drissi / *Paterson | Autocon Motorsports (USA) | Michael Lewis | Riley & Scott | Mk III C | | Elan | LMP1 |
| 13 | Lally / Pumpelly / Eversley | Marshall Cooke Racing (USA) | Dennis Marshall/James Cook | Lola | B2K/40 | | Ford | LMP2 |
| 16 | Weaver / Leitzinger / Wallace | Dyson Racing Team (USA) | Rob Dyson | Lola | EX257 | | AER | LMP1 |
| 19 | van der Steur / Devlin / van der Steur | van der Steur Racing, Inc. (USA) | Gunnar Van der Steur | Lola | B2K/40 | | AER | LMP2 |
| 20 | Lammers / Dyson | Dyson Racing Team (USA) | Rob Dyson | Lola | EX257 | | AER | LMP1 |
| 23 | Bernhard / Bergmeister / Maassen | Alex Job Racing (USA) | Alex Job | Porsche | 996 GT3-RSR | | Porsche | GT |
| 24 | Dumas / Lieb / Henzler | Alex Job Racing (USA) | Alex Job | Porsche | 996 GT3-RSR | | Porsche | GT |
| 27 | Minassian / Campbell-Walter | Creation Autosportif (GB) | Michael Jankowski | DBA | 03S | | Zytek | LMP1 |
| 30 | Field / Liddell / Duno | Intersport Racing (USA) | Jon Field | Lola | B2K/40 | | Judd | LMP2 |
| 31 | Murry / Stanton / *Petersen | White Lightning (USA) | Michael Petersen | Porsche | 996 GT3-RSR | | Porsche | GT |
| 35 | Lazzaro / Kelleners / de Simone | Risi Competizione (USA) | Giuseppe Risi | Ferrari | 360 Modena | GTC | Ferrari | GT |
| 37 | Field / Dayton / *Durand | Intersport Racing (USA) | Jon Field | Lola | B01/60 | | Judd | LMP1 |
| 38 | Lehto / Werner | ADT/Champion Racing (USA) | Dave Maraj | Audi | R8 | | Audi | LMP1 |
| 43 | Hindery / Jones / Luhr | BAM! (USA) | Peter Baron/tim Munday | Porsche | 996 GT3-RSR | | Porsche | GT |
| 44 | Pechnik / Fogarty / Neiman | Flying Lizard Motorsports (USA) | Johannes van Overbeek | Porsche | 996 GT3-RSR | | Porsche | GT |
| 45 | Law / Van Overbeek / Huisman | Flying Lizard Motorsports (USA) | Johannes van Overbeek | Porsche | 996 GT3-RSR | | Porsche | GT |
| 50 | Jeannette / Franchitti / Tinseau | Panoz Motor Sports (USA) | Don Panoz | Panoz | Esperante | GTLM | Elan | GT |
| 56 | McMurry / Willman / Bucknum | Miracle Motorsports (USA) | John Macaluso | Lola | B2K/40 | | AER | LMP2 |
| 60 | Halliday / Masarati / Donaldson | P.K. Sport (GB) | Mike Pickup | Porsche | 996 GT3-R | | Porsche | GT |
| 63 | Barbosa / Mowlem / Borcheller | ACEMCO Motorsports, LLC (USA) | Jeff Giangrande | Saleen | S7-R | | Ford | GTS |
| 66 | Rockenfeller / Wagner / Long | New Century Mortgage/Racer's Group (USA) | Kevin Buckler | Porsche | 996 GT3-RSR | | Porsche | GT |
| 67 | Ehret / Nearn / Collin | New Century Mortgage/Racer's Group (USA) | Kevin Buckler | Porsche | 996 GT3-RSR | | Porsche | GT |
| 71 | Belloc / Babini / Weickardt | Carsport America (USA) | Tom Weickardt | Dodge | Viper | GTS-R | Dodge | GTS |
| 78 | Matos / *Wars / *Skelton | J3 Racing, Inc. (USA) | Jaye M. Jackson | Porsche | 996 GT3-RS | | Porsche | GT |
| 79 | Sugden / Jackson / Pompidou | J3 Racing, Inc. (USA) | Jaye M. Jackson | Porsche | 996 GT3-RSR | | Porsche | GT |
| 92 | Montermini / *Mountain / *Wilson | Cirtek Motorsport (USA) | Robert Schirle | Ferrari | 360 Modena | GTC | Ferrari | GT |
| 93 | Bouchut / Ortelli | Cirtek Motorsport (USA) | Robert Schirle | Porsche | 996 GT3-RSR | | Porsche | GT |