| 01 | Montoya / Pruett / Rojas | Chip Ganassi Racing with Felix Sabates (USA) | Mike Hull | Riley | Mk XX | | Lexus | DP |
| 02 | Dixon / Franchitti / Lloyd | Chip Ganassi Racing with Felix Sabates (USA) | Mike Hull | Riley | Mk XI | | Lexus | DP |
| 07 | Collins / Edwards / Magnussen | Banner Racing | Leighton Reese | Pontiac | GXP.R | | Pontiac | GT |
| 09 | Cosmo / Pridmore / Russell / Ward | Spirit of Daytona Racing | Troy Flis | Coyote | CC/08 | | Porsche | DP |
| 2 | Finlay / Mears / Patrick / Wallace | Childress-Howard Motorsports | Richard Howard | Crawford | DP08 | | Pontiac | DP |
| 6 | Allmendinger / James / Pew / Valiante | Michael Shank Racing | Michael Shank | Riley | Mk XX | | Ford | DP |
| 7 | Bernhard / Briscoe / Dumas | Penske Racing | Timothy Cindric | Riley | Mk XX | | Porsche | DP |
| 10 | Lamy / Angelelli / Frisselle / Taylor | SunTrust Racing | Wayne Taylor | Dallara | DP01 | | Ford | DP |
| 12 | Dallenbach / Kasemets / Lester / Schramm | RVO Motorsports | Dave Watson | Riley | Mk XI | | Pontiac | DP |
| 13 | Beyer / Taylor / Taylor | Beyer Racing | Jon Baytos | Riley | Mk XI | | Pontiac | DP |
| 14 | Ragginger / Baldwin / Burtin / Friedman / McGehee | Autometrics Motorsports | Cory Friedman | Porsche | 997 GT3 Cup | | Porsche | GT |
| 16 | | Penske Racing | Timothy Cindric | Riley | Mk XX | | Porsche | DP |
| 21 | Daskalos / Montano / Oasis / Stout | Battery Tender/MCM Racing | Matt Connolly | Pontiac | GTO.R | | Pontiac | GT |
| 22 | Dalziel / Ducote / Dumoulin / Enge / de Quesada | Alegra Motorsports | Carlos de Quesada | Riley | Mk XI | | BMW | DP |
| 24 | | Autometrics/Mitchum Motorsports | Cory Friedman | Porsche | 997 GT3 Cup | | Porsche | GT |
| 26 | Jacalone / Jacalone / Lewis / Pobst | Gotham Competition | Jerome Jacalone | Porsche | 997 GT3 Cup | | Porsche | GT |
| 30 | Peterson / Cameron / Sellers / von Moltke | Racers Edge Motorsports | Jon Mirachi | Mazda | RX-8 | | Mazda | GT |
| 31 | Alessi / Kapudija / Michaelian / Michaelian / Zani | Battery Tender/MCM Racing | Matt Connolly | Porsche | 997 GT3 Cup | | Porsche | GT |
| 32 | Barrett / Forest / Merrill / Salvo / Westphal | PR1 Motorsports | Bobby Oergel | Pontiac | GXP.R | | Pontiac | GT |
| 33 | Maassen / Martien / Pilet / Zacharias | Wright Motorsports | BJ Zacharias | Porsche | 997 GT3 Cup | | Porsche | GT |
| 34 | Aschenbach / Valverde / Willsley | Victory Junction-Orbit Racing | Rodger Hawley | Porsche | 997 GT3 Cup | | Porsche | GT |
| 40 | Dempsey / Espenlaub / Foster / Lewis, Jr. | Dempsey Racing | Joe Foster | Mazda | RX-8 | | Mazda | GT |
| 42 | Nonnamaker / Sahlen / Nonnamaker / Nonnamaker | Team Sahlen | Mike Thomas | Chevrolet | Corvette | | Chevrolet | GT |
| 43 | Nonnamaker / Sahlen / Nonnamaker / Nonnamaker | Team Sahlen | Mike Thomas | Chevrolet | Corvette | | Chevrolet | GT |
| 44 | Bentley / Carter / Paquette | Bullet Racing | Steve Pacquette | Porsche | 996 GT3 Cup | I | Porsche | GT |
| 45 | Goossens / Hindery, Jr. / Manning / Petty | Victory Junction-Orbit Racing | Peter Baron | Riley | Mk XI | | BMW | DP |
| 52 | Bertuzzi / Pirri / Papis / Swartzbaugh | Mastercar-Coast 2 Costa Racing | | Ferrari | F430 | Challenge | Ferrari | GT |
| 55 | Bouchut / Tucker / Zabinski | Level 5 Motorsports | David Stone | Riley | Mk XX | | BMW | DP |
| 56 | Campanico / Drudi / Montanari / Sperati / Wilton | Mastercar-Coast 2 Costa Racing | | Ferrari | F430 | Challenge | Ferrari | GT |
| 57 | Bucknum / Davis / Liddell | Stevenson Motorsports | John Stevenson | Pontiac | GXP.R | | Pontiac | GT |
| 58 | Donohue / Garcia / Law / Rice | Brumos Racing | Michael Colucci | Riley | Mk XI | | Porsche | DP |
| 59 | France / Barbosa / Borcheller / Haywood | Brumos Racing (USA) | Michael Colucci | Riley | Mk XI | | Porsche | DP |
| 60 | Braun / Hunter-Reay / Negri / Patterson | Michael Shank Racing | Michael Shank | Riley | Mk XX | | Ford | DP |
| 61 | Empringham / Farano / Frisselle / Figge / Wilkins | AIM Autosport | Ian Willis | Riley | Mk XX | | Ford | DP |
| 63 | Kossmann / Ledoux / Quinlan / Watkins / Zadig | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 64 | Lowe / Pace / Van Overbeek / Sugden | JLowe Racing | Jim Lowe | Porsche | 997 GT3 Cup | | Porsche | GT |
| 65 | Holzer / Miller / Potter / Stanton | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 66 | Pumpelly / Ballou / Collard / Lietz / George, Jr. | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 67 | Bergmeister / Lally / Long / Marks / Valentine | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 68 | Ende / Gutierrez / Miller / Pallis / Schroeder | TRG (USA) | Jason Myers | Porsche | 997 GT3 Cup | | Porsche | GT |
| 69 | Assentato / Longhi / Plumb / Segal | SpeedSource | Sylvain Tremblay | Mazda | RX-8 | | Mazda | GT |
| 70 | Bomarito / Ham / Haskell / Tremblay | SpeedSource | Sylvain Tremblay | Mazda | RX-8 | | Mazda | GT |
| 75 | Gavin / Krohn / van de Poele | Krohn Racing | David Brown | Lola | B08/70 | | Ford | DP |
| 76 | Jönsson / Turner / Zonta | Krohn Racing | David Brown | Lola | B08/70 | | Ford | DP |
| 77 | Bobbi / Gidley / Gollin / Jaeger | Doran Racing (USA) | Kevin Doran | Dallara | DP01 | | Ford | DP |
| 85 | Gomez / Graeff / Henzler / Yarab, Jr. | Farnbacher Loles Racing | Gregory Loles | Porsche | 997 GT3 Cup | | Porsche | GT |
| 86 | Farnbacher / Lux / Marsh / Roush | Farnbacher Loles Racing | Gregory Loles | Porsche | 997 GT3 Cup | | Porsche | GT |
| 87 | Henzler / Keen / Werner / Westbrook | Farnbacher Loles Racing | Gregory Loles | Porsche | 997 GT3 Cup | | Porsche | GT |
| 88 | Johnson / Lacey / Nearn / Sofronas / Westbrook | Farnbacher Loles Racing | Gregory Loles | Porsche | 997 GT3 Cup | | Porsche | GT |
| 89 | Petrobelli / Renauer / Ricci / Rosa / Simonsen | Farnbacher Loles Racing | Gregory Loles | Porsche | 997 GT3 Cup | | Porsche | GT |
| 97 | Gue / Long | Stevenson Motorsports | John Stevenson | Chevrolet | Corvette | | Chevrolet | GT |
| 99 | Gurney / Fogarty / Johnson / Vasser | Gainsco/Bob Stallings Racing | Bob Stallings | Riley | Mk XX | | Pontiac | DP |