| << 2013 | 2015 >> |

| # | pic | Versenyző | Nemz. | Autó | Csapat | Chassis/motor |
| 2 | Juan-Pablo Montoya | Kolumbia |
| Team Penske | Dallara DW12 - Chevrolet | |
| 3 | Helio Castroneves | Brazil |
| Team Penske | Dallara DW12 - Chevrolet | |
| 7 | Mikhael Aleshin (R) | Orosz |
| Schmidt Peterson Motorsports | Dallara DW12 - Honda | |
| 8 | Ryan Briscoe | Új-Zéland |
| NTT Data Chip Ganassi Racing | Dallara DW12 - Chevrolet | |
| 9 | Scott Dixon | Új-Zéland |
| Target Chip Ganassi Racing | Dallara DW12 - Chevrolet | |
| 10 | Tony Kanaan | Brazil |
| Target Chip Ganassi Racing | Dallara DW12 - Chevrolet | |
| 11 | Sebastien Bourdais | Francia |
| KVSH Racing | Dallara DW12 - Chevrolet | |
| 12 | Will Power | Ausztrál |
| Team Penske | Dallara DW12 - Chevrolet | |
| 14 | Takuma Sato | Japán |
| A.J. Foyt Enterprises | Dallara DW12 - Honda | |
| 15 | Graham Rahal | USA |
| Rahal Letterman Lanigan Racing | Dallara DW12 - Honda | |
| 17 | Sebastian Saavedra | Kolumbia |
| KV AFS Racing | Dallara DW12 - Chevrolet | |
| 18 | Carlos Huertas (R) | Kolumbia |
| Dale Coyne Racing | Dallara DW12 - Honda | |
| 19 | Justin Wilson | Angol |
| Dale Coyne Racing | Dallara DW12 - Honda | |
| 20 | Ed Carpenter | USA |
| Ed Carpenter Racing | Dallara DW12 - Chevrolet | |
| 20 | Mike Conway | Angol |
| Ed Carpenter Racing | Dallara DW12 - Chevrolet | |
| 25 | Marco Andretti | USA |
| Andretti Autosport | Dallara DW12 - Honda | |
| 27 | James Hinchcliffe | Kanada |
| Andretti Autosport | Dallara DW12 - Honda | |
| 28 | Ryan Hunter-Reay | USA |
| Andretti Autosport | Dallara DW12 - Honda | |
| 34 | Carlos Munoz (R) | Kolumbia |
| Andretti Autosport | Dallara DW12 - Honda | |
| 67 | Joseph Newgarden | USA |
| Sarah Fisher Hartman Racing | Dallara DW12 - Honda | |
| 77 | Simon Pagenaud | Francia |
| Schmidt Peterson Motorsports | Dallara DW12 - Honda | |
| 83 | Charlie Kimball | USA |
| Novo Nordisk Chip Ganassi Racing | Dallara DW12 - Honda | |
| 98 | Jack Hawksworth (R) | Angol |
| Bryan Herta Autosport | Dallara DW12 - Honda |
| # | pic | Versenyző | Nemz. | Autó | Csapat | Chassis/motor |
| 5 | Jacques Villeneuve | Kanada |
| Schmidt Peterson Motorsports | Dallara DW12 - Honda | |
| 6 | Townsend Bell | USA |
| KV Racing Technlogy | Dallara DW12 - Chevrolet | |
| 16 | Oriol Servia | Katalán |
| Rahal Letterman Lanigan Racing | Dallara DW12 - Honda | |
| 16 | Luca Filippi (R) | Olasz |
| Rahal Letterman Lanigan Racing | Dallara DW12 - Honda | |
| 21 | JR Hildebrand | USA |
| Ed Carpenter Racing | Dallara DW12 - Chevrolet | |
| 22 | Sage Karam (R) | USA |
| Dreyer & Reynbold-Kingdom Racing | Dallara DW12 - Chevrolet | |
| 26 | Franck Montagny (R) | Francia |
| Andretti Autosport | Dallara DW12 - Honda | |
| 26 | Kurt Busch (R) | USA |
| Andretti Autosport | Dallara DW12 - Honda | |
| 33 | James Davison (R) | Ausztrál |
| KVRT/Always Evolving Racing | Dallara DW12 - Chevrolet | |
| 41 | Martin Plowman (R) | Angol |
| A.J. Foyt Enterprises | Dallara DW12 - Honda | |
| 63 | Pippa Mann | Angol |
| Dale Coyne Racing | Dallara DW12 - Honda | |
| 68 | Alex Tagliani | USA |
| Sarah Fisher Hartman Racing | Dallara DW12 - Honda | |
| 91 | Buddy Lazier | USA |
| Lazier Partners Racing, Inc. | Dallara DW12 - Chevrolet |