| 01 | van der Zande / Bourdais | Cadillac Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 02 | Bamber / Lynn | Cadillac Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 1 | Sellers / Snow / Johansson | Paul Miller Racing (USA) | | BMW | M4 | G82 GT3 | BMW | GTD |
| 3 | Garcia / Taylor | Corvette Racing (USA) | | Chevrolet | Corvette C8 | .R GTD | Chevrolet | GTD Pro |
| 5 | Vautier / Westbrook / Duval | JDC Miller MotorSports (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 6 | Machavern / *de Wilde / *Formal | Muehlner Motorsports America (B) | | Duqueine | D08 | | Nissan | LMP3 |
| 7 | Mantella / Bell / Boyd | Forty7 Motorsports (USA) | | Duqueine | D08 | | Nissan | LMP3 |
| 8 | Farano / Deletraz / Pinto de Andrade | Tower Motorsport (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 9 | Campbell / Jaminet | Pfaff Motorsports (CDN) | | Porsche | 991 GT3 R | | Porsche | GTD Pro |
| 10 | Taylor / Albuquerque | Konica Minolta Acura ARX-05 (USA) | Wayne Taylor | Acura | ARX-05 | | Acura | DPi |
| 11 | Thomas / Pierson / Bomarito | PR1 Mathiasen Motorsports (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 12 | Montecalvo / Telitz / Heistand | VasserSullivan (USA) | | Lexus | RC F | GT3 | Lexus | GTD |
| 13 | Fidani / Kern / *Marcelli | AWA (CDN) | Andrew Wojteczko | Duqueine | D08 | | Nissan | LMP3 |
| 14 | Kirkwood / Barnicoat | VasserSullivan (USA) | | Lexus | RC F | GT3 | Lexus | GTD Pro |
| 16 | Hardwick / Robichon / Heylen | Wright Motorsports (USA) | | Porsche | 991 GT3 R | | Porsche | GTD |
| 18 | Merriman / Tilley / Dalziel | Era Motorsport (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 20 | Andersen / Fjordbach / Scherer | High Class Racing (DK) | | Oreca | 07 | | Gibson | LMP2 |
| 21 | Mann / Pérez Companc / Vilander | AF Corse (I) | Amato Ferrari | Ferrari | 488 | GT3 | Ferrari | GTD |
| 23 | de Angelis / Martin / James | Heart of Racing Team (USA) | Ian James | Aston Martin | Vantage AMR | GT3 | Aston Martin | GTD Pro |
| 25 | De Phillippi / Edwards / Farfus | BMW M Team RLL (USA) | | BMW | M4 | G82 GT3 | BMW | GTD Pro |
| 27 | Gunn / Riberas | Heart of Racing Team (USA) | Ian James | Aston Martin | Vantage AMR | GT3 | Aston Martin | GTD |
| 29 | van Eerd / Van Der Garde / Murry | Racing Team Nederland (NL) | | Oreca | 07 | | Gibson | LMP2 |
| 30 | Balogh / Grist / Siegel | Jr III Racing (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 31 | Pla / Derani / Conway | Whelen Engineering Racing (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 32 | Skeen / McAleer / Müller | Team Korthoff Motorsports (USA) | | Mercedes-AMG | GT3 | | Mercedes-AMG | GTD |
| 33 | Barbosa / Jakobsen / Willsey | Sean Creech Motorsport (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 36 | Andretti / Burdon / Chaves | Andretti Autosport (USA) | Michael Andretti | Ligier | JS P320 | | Nissan | LMP3 |
| 38 | Goldburg / Lindh / Shields | Performance Tech Motorsports (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 39 | Megennis / Lewis / Westphal | CarBahn with Peregrine Racing (USA) | | Lamborghini | Huracán | GT3 Evo | Lamborghini | GTD |
| 40 | Varrone / Hanratty / Vance | FastMD Racing (USA) | | Duqueine | D08 | | Nissan | LMP3 |
| 42 | Yount / Conwright / Holzer | NTE/SSR (USA) | | Lamborghini | Huracán | GT3 | Lamborghini | GTD |
| 44 | Potter / Lally / Pumpelly | Magnus Racing (USA) | John Potter | Aston Martin | Vantage AMR | GT3 | Aston Martin | GTD |
| 47 | Lacorte / Sernagiotto / Fuoco | Cetilar Racing (I) | | Ferrari | 488 | GT3 | Ferrari | GTD |
| 48 | Rockenfeller / Kobayashi / Johnson | Ally Cadillac (USA) | | Cadillac | DPi-V.R | | Cadillac | DPi |
| 52 | Keating / Jensen / Huffaker | PR1 Mathiasen Motorsports (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 54 | Bennett / Braun / Kurtz | CORE Autosport (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 57 | Ward / Ellis / Dienst | Winward Racing (USA) | | Mercedes-AMG | GT3 | | Mercedes-AMG | GTD |
| 58 | Sarchet / Maxson / *Dickerson | MLT Motorsports (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 59 | Gallagher / Miller / Holton | Crucial Motorsports (USA) | | McLaren | 720S | GT3 | McLaren | GTD |
| 60 | Jarvis / Blomqvist | Meyer Shank Racing W/Curb-Agajanian (USA) | Michael Shank | Acura | ARX-05 | | Acura | DPi |
| 62 | Serra / Rigon | Risi Competizione (USA) | | Ferrari | 488 | GT3 | Ferrari | GTD Pro |
| 66 | Bechtolsheimer / *Simpson / *Farnbacher | Gradient Racing (USA) | | Acura | NSX | GT3 | Acura | GTD |
| 70 | Pepper / Millroy / Iribe | Inception Racing (GB) | | McLaren | 720S | GT3 | McLaren | GTD |
| 74 | Robinson / Fraga / van Berlo | Riley Motorsports (USA) | | Ligier | JS P320 | | Nissan | LMP3 |
| 79 | Grenier / MacNeil / Engel | WeatherTech Racing (USA) | | Mercedes-AMG | GT3 | | Mercedes-AMG | GTD Pro |
| 81 | Hedman / Montoya / Montoya | DragonSpeed USA (USA) | | Oreca | 07 | | Gibson | LMP2 |
| 96 | Dinan / Foley / Auberlen | Turner Motorsport (USA) | | BMW | M4 | G82 GT3 | BMW | GTD |
| 99 | Ferriol / Legge / Wilson | Team Hardpoint (USA) | | Porsche | 991 GT3 R | | Porsche | GTD |