| 01 | Pruett / Rojas / Festa | TELMEX Chip Ganassi with Felix Sabates (USA) | Mike Hull | Riley | Mk XI | | Lexus | DP |
| 05 | Auberlen / Alhadeff / Hand | Luggage Express Team Sigalsport BMW | Emmanuel Lupe | Riley | Mk XI | | BMW | DP |
| 06 | Reese / Pilgrim / Lewis, Jr. | Banner Racing (USA) | Leighton Reese | Pontiac | GXP.R | | Pontiac | GT |
| 07 | Edwards / Collins / Pilgrim | Banner Racing | Leighton Reese | Pontiac | GXP.R | | Pontiac | GT |
| 3 | Lewis / Ruhlman | Southard Motorsports | Steve Southard | Riley | Mk XI | | Lexus | DP |
| 6 | Pew / James | Michael Shank Racing | Michael Shank | Riley | Mk XI | | Lexus | DP |
| 10 | Taylor / Angelelli / Cochet | SunTrust Racing | Debbie Savini | Riley | Mk XI | | Pontiac | DP |
| 11 | Carpentier / Bessette / Enge | SAMAX Motorsport | Peter Baron | Riley | Mk XI | | Pontiac | DP |
| 12 | Schramm / Bell | RVO Motorsports | Dave Watson | Riley | Mk XI | | Pontiac | DP |
| 14 | Friedman / Skea / Smith | Autometrics Motorsports | Cory Friedman | Porsche | 997 GT3 Cup | | Porsche | GT |
| 16 | Dyson / Dyson / Leitzinger | Howard Motorsports (USA) | Richard Howard | Crawford | DP03 | | Porsche | DP |
| 17 | Wilkins / Papadopoulos / Julien | Doncaster Racing | John Lacey | Porsche | 997 GT3 Cup | | Porsche | GT |
| 19 | Finlay / Valiante / Festa | Chip Ganassi with Felix Sabates | Steve Cameron? | Riley | Mk XI | | Lexus | DP |
| 21 | Connolly / Prewitt / Price | Matt Connolly Motorsports | Matt Connolly | Pontiac | GTO.R | | Pontiac | GT |
| 22 | Dumoulin / Gabel | Alegra Motorsports/Fiorano Racing | Carlos de Quesada | Porsche | 997 GT3 Cup | | Porsche | GT |
| 23 | Bergmeister / Long | Alex Job Racing | Alex Job | Crawford | DP03 | | Porsche | DP |
| 24 | Michaelian / Workman / George, Jr. | Matt Connolly Motorsports (USA) | Matt Connolly | BMW | M3 | E46 | BMW | GT |
| 26 | de Quesada / Dumoulin / Gabel | Alegra Motorsports/Fiorano Racing | Carlos de Quesada | Porsche | 997 GT3 Cup | | Porsche | GT |
| 27 | O'Connell / Speakman | O'Connell Racing | Kevin O'Connell | Porsche | 997 GT3 Cup | | Porsche | GT |
| 28 | Baas / White / Miller | At Speed Motorsports | Bob Miller, Sr. | Porsche | 997 GT3 Cup | | Porsche | GT |
| 30 | Staveley / Aschenbach / Pavan | Racers Edge Motorsports | Jon Mirachi | Pontiac | GXP.R | | Pontiac | GT |
| 39 | Fittipaldi / Brix / Garcia | Cheever Racing (USA) | Eddie Cheever, Jr. | Fabcar | FDSC/03 | | Porsche | DP |
| 42 | Sahlen / Nonnamaker | Team Sahlen | Mike Thomas | Chevrolet | Corvette | | Chevrolet | GT |
| 43 | Nonnamaker / Nonnamaker | Team Sahlen | Mike Thomas | Chevrolet | Corvette | | Chevrolet | GT |
| 57 | Bunting / Cicero | Stevenson Motorsports (USA) | John Stevenson | Chevrolet | Corvette | Z06 | Chevrolet | GT |
| 58 | Donohue / Law | Red Bull/Brumos Porsche | Michael Colucci | Riley | Mk XI | | Porsche | DP |
| 59 | France / Haywood / Barbosa | Brumos Porsche/Kendall (USA) | Michael Colucci | Riley | Mk XI | | Porsche | DP |
| 60 | Patterson / Negri | Michael Shank Racing | Michael Shank | Riley | Mk XI | | Lexus | DP |
| 61 | Frisselle / Wilkins / Frisselle | AIM Autosport | Ian Willis | Riley | Mk XI | | Lexus | DP |
| 64 | Lowe / Pace | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 65 | Smith / DiLeo / Sellers | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 66 | Lally / Pumpelly / Valentine | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 67 | Potter / Marden / Milner | TRG (USA) | Kevin Buckler | Porsche | 997 GT3 Cup | | Porsche | GT |
| 69 | Assentato / Snyder / Segal / *Longhi | SpeedSource | Sylvain Tremblay | Mazda | RX-8 | | Mazda | GT |
| 70 | Haskell / Tremblay / Ham | SpeedSource | Sylvain Tremblay | Mazda | RX-8 | | Mazda | GT |
| 72 | Swartzbaugh / Liddell / Tafel | Tafel Racing | Tony Dowe | Porsche | 997 GT3 Cup | | Porsche | GT |
| 74 | Lux / Henzler | Tafel Racing | Tony Dowe | Porsche | 997 GT3 Cup | | Porsche | GT |
| 75 | Braun / Papis / Jönsson | Krohn Racing | Jeff Hazell | Riley | Mk XI | | Pontiac | DP |
| 76 | Braun / Krohn / Jönsson | Krohn Racing | Jeff Hazell | Riley | Mk XI | | Pontiac | DP |
| 77 | Gidley / Cosmo | Feeds The Need/Doran Racing | Kevin Doran | Doran | JE4 | | Ford | DP |
| 81 | Johnson / Westbrook | Synergy Racing | Cole Scrogham | Porsche | 997 GT3 Cup | | Porsche | GT |
| 85 | Farnbacher / Keen / Stanton | Farnbacher Loles Motorsports | Alan Lourenco | Porsche | 997 GT3 Cup | | Porsche | GT |
| 87 | Miller / Werner / Stanton | Farnbacher Loles Motorsports | Gregory Loles | Porsche | 997 GT3 Cup | | Porsche | GT |
| 91 | Matthews / Goossens / Hunter-Reay | Riley-Matthews Motorsports | Bill Riley | Riley | Mk XI | | Pontiac | DP |
| 97 | Riggins / Rice / Gue | Stevenson Motorsports | John Stevenson | Chevrolet | Corvette | Z06 | Chevrolet | GT |
| 99 | Gurney / Fogarty | Gainsco/Bob Stallings Racing | Bob Stallings | Riley | Mk XI | | Pontiac | DP |