| No. | Class | Team | Drivers | Car | Engine | Tyres | Fuel | |
|---|---|---|---|---|---|---|---|---|
| 1 | 0 | P | DeltaWing Racing | Memo Rojas Katherine Legge Gabby Chaves Andy Meyrick | DeltaWing DWC13 | Elan | C | E10 |
| 2 | 1 | P | Tequila Patron ESM | Scott Sharp Ryan Dalziel David Heinemeier Hansson | Honda HPD ARX | Honda | C | E10 |
| 3 | 2 | P | Tequila Patron ESM | Ed Brown Johannes van Overbeek Jon Fogarty | Honda HPD ARX | Honda | C | E10 |
| 4 | 5 | P | Action Express Racing | João Barbosa Christian Fittipaldi Sebastien Bourdais | Corvette DP | Chevrolet | C | E10 |
| 5 | 7 | P | Starworks Motorsport | Brendon Hartley Rubens Barrichello Ryan Hunter-Reay Tor Graves Scott Mayer | Riley DP | BMW Power | C | E10 |
| 6 | 10 | P | Wayne Taylor Racing | Jordan Taylor Ricky Taylor Max Angelelli | Corvette DP | Chevrolet | C | E10 |
| 7 | 31 | P | Action Express Racing | Eric Curran Dane Cameron Max Papis Phil Keen | Corvette DP | Chevrolet | C | E10 |
| 8 | 50 | P | Highway To Help | Jim Pace Bryon DeFoor David Hinton Dorsey Schroeder Doug Smith | Riley DP | BMW Power | C | E10 |
| 9 | 57 | P | Krohn Racing | Tracy Krohn Olivier Pla Nic Jonsson Alex Brundle | Ligier JS PS2 | Judd | C | E10 |
| 10 | 60 | P | Michael Shank Racing | John Pew Ozz Negri Jr AJ Allmendinger Matt McMurry | Ligier JS PS2 | Honda HPD | C | E10 |
| 11 | 66 | P | RG Racing | Robert Gewirtz Shane Lewis Mark Kvamme David Cheng | Riley DP | BMW Power | C | E10 |
| 12 | 70 | P | SpeedSource | Jonathan Bomarito Tristan Nunez James Hinchcliffe Sylvain Tremblay | Mazda | Mazda | C | D |
| 13 | 90 | P | VisitFlorida.com Racing | Richard Westbrook Michael Valiante Mike Rockenfeller Guy Cosmo | Corvette DP | Chevrolet | C | E10 |
| 14 | 01 | P | Chip Ganassi Racing | Scott Pruett Joey Hand Charlie Kimball Sage Karam | Riley DP | Ford EcoBoost | C | E10 |
| 15 | 02 | P | Chip Ganassi Racing | Scott Dixon Tony Kanaan Kyle Larson Jamie McMurray | Riley DP | Ford EcoBoost | C | E10 |
| 16 | 07 | P | SpeedSource | Joel Miller Tom Long Ben Devlin Sylvain Tremblay | Mazda | Mazda | C | D |
| 17 | 8 | PC | Starworks Motorsport | Mirco Schultis Renger van der Zande Alex Popow Mike Hedlund Filipe Albuquerque | ORECA FLM09 | Chevrolet | C | E10 |
| 18 | 11 | PC | RSR Racing | Chris Cumming Bruno Junqueira Jack Hawksworth Gustavo Menezes | ORECA FLM09 | Chevrolet | C | E10 |
| 19 | 16 | PC | BAR1 Motorsports | Johnny Mowlem Tom Papadopoulos Tomy Drissi Brian Alder Martin Plowman | ORECA FLM09 | Chevrolet | C | E10 |
| 20 | 38 | PC | Performance Tech Motorsports | James French Jerome Mee James Vance Sean Johnston | ORECA FLM09 | Chevrolet | C | E10 |
| 21 | 52 | PC | PR1/Mathiasen Motorsports | Mike Guasch Andrew Novich Andrew Palmer Tom Kimber-Smith | ORECA FLM09 | Chevrolet | C | E10 |
| 22 | 54 | PC | CORE autosport | Jon Bennett Colin Braun Mark Wilkins James Gue | ORECA FLM09 | Chevrolet | C | E10 |
| 23 | 61 | PC | BAR1 Motorsports | Martin Plowman Marc Drumwright Ivo Breukers Shelby Blackstock | ORECA FLM09 | Chevrolet | C | E10 |
| 24 | 85 | PC | JDC/Miller Motorsports | Mikhail Goikhberg Chris Miller Stephen Simpson Rusty Mitchell Tristan Vautier | ORECA FLM09 | Chevrolet | C | E10 |
| 25 | 3 | GTLM | Corvette Racing | Jan Magnussen Antonio Garcia Ryan Briscoe | Chevrolet Corvette C7.R | Chevrolet | M | E85C |
| 26 | 4 | GTLM | Corvette Racing | Oliver Gavin Tommy Milner Simon Pagenaud | Chevrolet Corvette C7.R | Chevrolet | M | E85C |
| 27 | 17 | GTLM | Team Falken Tire | Wolf Henzler Bryan Sellers Patrick Long | Porsche 911 RSR | Porsche | F | E85C |
| 28 | 24 | GTLM | BMW Team RLL | John Edwards Lucas Luhr Jens Klingmann Graham Rahal | BMW Z4 GTE | BMW | M | E85C |
| 29 | 25 | GTLM | BMW Team RLL | Bill Auberlen Dirk Werner Augusto Farfus Bruno Spengler | BMW Z4 GTE | BMW | M | E85C |
| 30 | 51 | GTLM | AF Corse | François Perrodo Emmanuel Collard Gianmaria Bruni Toni Vilander | Ferrari F458 Italia | Ferrari | M | E85C |
| 31 | 62 | GTLM | Risi Competizione | Pierre Kaffer Davide Rigon Giancarlo Fisichella Olivier Beretta | Ferrari F458 Italia | Ferrari | M | E85C |
| 32 | 98 | GTLM | Aston Martin Racing | Pedro Lamy Paul Dalla Lana Darren Turner Stefan Mücke Matthias Lauda | Aston Martin Vantage V8 | Aston Martin | M | E10 |
| 33 | 911 | GTLM | Porsche North America | Nick Tandy Patrick Pilet Marc Lieb Michael Christensen | Porsche 911 RSR | Porsche | M | E85C |
| 34 | 912 | GTLM | Porsche North America | Jörg Bergmeister Earl Bamber Frédéric Makowiecki Michael Christensen | Porsche 911 RSR | Porsche | M | E85C |
| 35 | 18 | GTD | Mühlner Motorsports America | Darryl O'Young Matteo Beretta Marc Basseng Connor De Phillippi Niki Mayr-Meinhof | Porsche 911 GT America | Porsche | C | E10 |
| 36 | 19 | GTD | Mühlner Motorsports America | Jim Michaelian Connor De Phillippi Ricardo Flores Michael Lira | Porsche 911 GT America | Porsche | C | E10 |
| 37 | 22 | GTD | Alex Job Racing | Cooper MacNeill Leh Keen Andrew Davis Shane van Gisbergen | Porsche 911 GT America | Porsche | C | E10 |
| 38 | 23 | GTD | Team Seattle/Alex Job Racing | Ian James Mario Farnbacher Alex Riberas | Porsche 911 GT America | Porsche | C | E10 |
| 39 | 28 | GTD | Konrad Motorsport | Klaus Bachler Christopher Zoechling Christian Engelhart Lance Willsey Rolf Ineichen | Porsche 911 GT America | Porsche | C | E10 |
| 40 | 33 | GTD | Riley Motorsports | Ben Keating Jeroen Bleekemolen Al Carter Marc Goosens Sebastiaan Bleekemolen | Dodge Viper SRT | Viper V10 | C | E10 |
| 41 | 44 | GTD | Magnus Racing | John Potter Andy Lally Marco Seefried Martin Ragginger | Porsche 911 GT America | Porsche | C | E10 |
| 42 | 45 | GTD | Flying Lizard Motorsports | Markus Winkelhock Robert Thorne Satoshi Hoshino Tomonobu Fujii | Audi R8 LMS | Audi | C | E10 |
| 43 | 48 | GTD | Paul Miller Racing | Christopher Haase Bryce Miller Dion von Moltke Réné Rast | Audi R8 LMS | Audi | C | E10 |
| 44 | 49 | GTD | AF Corse | Pasin Lathouras Michele Rugolo Rui Aguas Matt Griffin | Ferrari 458 Italia | Ferrari | C | E10 |
| 45 | 58 | GTD | Wright Motorsports | Madison Snow Jan Heylen Patrick Dempsey Philipp Eng | Porsche 911 GT America | Porsche | C | E10 |
| 46 | 63 | GTD | Scuderia Corsa | Bill Sweedler Townsend Bell Anthony Lazzaro Jeff Segal | Ferrari 458 Italia | Ferrari | C | E10 |
| 47 | 64 | GTD | Scuderia Corsa | Francisco Longo Daniel Serra Marcos Gomes Andrea Bertolini | Ferrari 458 Italia | Ferrari | C | E10 |
| 48 | 73 | GTD | Park Place Motorsports | Patrick Lindsey Spencer Pumpelly Jim Norman Nelson Canache Jr Kevin Estre | Porsche 911 GT America | Porsche | C | E10 |
| 49 | 81 | GTD | GB Autosport | Damien Faulkner Kuba Giermaziak Mike Skeen Rory Butcher Michael Avenatti | Porsche 911 GT America | Porsche | C | E10 |
| 50 | 93 | GTD | Riley Motorsports | Ben Keating Dominik Farnbacher Al Carter Kuno Wittmer Cameron Lawrence | Dodge Viper SRT | BMW | C | E10 |
| 51 | 97 | GTD | Turner Motorsport | Michael Marsal Markus Palttala Andy Priaulx Boris Said | BMW Z4 | BMW | C | E10 |
| 52 | 007 | GTD | TRG-AMR | Christina Nielsen James Davison Christoffer Nygaard Brandon Davis | Aston Martin V12 Vantage | Aston Martin | C | E10 |
| 53 | 009 | GTD | TRG-AMR | Derek DeBoer Max Riddle Elisio Salazar Kris Wilson | Aston Martin V12 Vantage | Aston Martin | C | E10 |
