IndyCar 2021 Birmingham
| # | Piloto | Equipe | Carro | Motor | Pneus | |
|---|---|---|---|---|---|---|
| 2 | Josef Newgarden | Team Penske | Dallara DW12 | Chevrolet | Firestone | |
| 3 |  Scott McLaughlin | Team Penske | Dallara DW12 | Chevrolet | Firestone | |
| 4 |  Dalton Kellett | A.J. Foyt Enterprises | Dallara DW12 | Chevrolet | Firestone | |
| 5 |  Patricio O'Ward | Schmidt Peterson Motorsports | Dallara DW12 | Chevrolet | Firestone | |
| 7 |  Felix Rosenqvist | Schmidt Peterson Motorsports | Dallara DW12 | Chevrolet | Firestone | |
| 8 | Marcus Ericsson | Chip Ganassi Racing | Dallara DW12 | Honda | Firestone | |
| 9 | Scott Dixon | Chip Ganassi Racing | Dallara DW12 | Honda | Firestone | |
| 10 |  Alex Palou | Chip Ganassi Racing | Dallara DW12 | Honda | Firestone | |
| 12 |  Will Power | Team Penske | Dallara DW12 | Chevrolet | Firestone | |
| 14 |  Sébastien Bourdais | A.J. Foyt Enterprises | Dallara DW12 | Chevrolet | Firestone | |
| 15 | Graham Rahal | Rahal Letterman Lanigan Racing | Dallara DW12 | Honda | Firestone | |
| 18 |  Ed Jones | Dale Coyne Racing | Dallara DW12 | Honda | Firestone | |
| 20 | Conor Daly | Ed Carpenter Racing | Dallara DW12 | Chevrolet | Firestone | |
| 21 |  Rinus Kalmthout | Ed Carpenter Racing | Dallara DW12 | Chevrolet | Firestone | |
| 22 | Simon Pagenaud | Team Penske | Dallara DW12 | Chevrolet | Firestone | |
| 26 | Colton Herta | Andretti Autosport | Dallara DW12 | Honda | Firestone | |
| 27 | Alexander Rossi | Andretti Autosport | Dallara DW12 | Honda | Firestone | |
| 28 | Ryan Hunter-Reay | Andretti Autosport | Dallara DW12 | Honda | Firestone | |
| 29 | James Hinchcliffe | Andretti Autosport | Dallara DW12 | Honda | Firestone | |
| 30 |  Takuma Sato | Rahal Letterman Lanigan Racing | Dallara DW12 | Honda | Firestone | |
| 48 | Jimmie Johnson | Chip Ganassi Racing | Dallara DW12 | Honda | Firestone | |
| 51 | Romain Grosjean | Dale Coyne Racing | Dallara DW12 | Honda | Firestone | |
| 59 |  Max Chilton | Carlin | Dallara DW12 | Chevrolet | Firestone | |
| 60 | Jack Harvey | Michael Shank Racing | Dallara DW12 | Honda | Firestone |