| 2 |
 Josef Newgarden |
22.12.1990 |
Team Penske |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 3 |
 Scott McLaughlin |
10.06.1993 |
Team Penske |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 12 |
 Will Power |
01.03.1979 |
Team Penske |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 5 |
 Patricio O'Ward |
06.05.1999 |
 McLaren |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 6 |
 Felix Rosenqvist |
07.11.1991 |
McLaren |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 7 |
Alexander Rossi |
25.09.1991 |
McLaren |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 66 |
 Tony Kanaan |
31.12.1974 |
McLaren |
Dallara DW12 (IR18) - Chevrolet |
FI | 1 | |
| 06 |
Helio Castroneves |
10.05.1971 |
Meyer Shank Racing |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 60 |
 Simon Pagenaud |
18.05.1984 |
Meyer Shank Racing |
Dallara DW12 (IR18) - Honda |
FI | 8 | |
| 60 |
Conor Daly |
17.12.1991 |
Meyer Shank Racing |
Dallara DW12 (IR18) - Honda |
FI | 3 | |
| 60 |
Tom Blomqvist |
30.11.1993 |
Meyer Shank Racing |
Dallara DW12 (IR18) - Honda |
FI | 3 | |
| 60 |
Linus Lundqvist |
26.03.1999 |
Meyer Shank Racing |
Dallara DW12 (IR18) - Honda |
FI | 3 | |
| 8 |
Marcus Ericsson |
02.09.1990 |
Chip Ganassi Racing |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 9 |
Scott Dixon |
22.07.1980 |
Chip Ganassi Racing |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 10 |
 Alex Palou |
01.04.1997 |
Chip Ganassi Racing |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 11 |
Marcus Armstrong |
29.07.2000 |
Chip Ganassi Racing |
Dallara DW12 (IR18) - Honda |
FI | 12 | |
| 11 |
 Takuma Sato |
20.01.1977 |
Chip Ganassi Racing |
Dallara DW12 (IR18) - Honda |
FI | 5 | |
| 14 |
Santino Ferrucci |
31.05.1998 |
A.J. Foyt Enterprises |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 55 |
 Benjamin Pedersen |
11.05.1999 |
A.J. Foyt Enterprises |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 15 |
Graham Rahal |
04.01.1989 |
Rahal Letterman Lanigan Racing |
Dallara DW12 (IR18) - Honda |
FI | 16 | |
| 30 |
Jack Harvey |
15.04.1993 |
Rahal Letterman Lanigan Racing |
Dallara DW12 (IR18) - Honda |
FI | 14 | |
| 30 |
Conor Daly |
17.12.1991 |
Rahal Letterman Lanigan Racing |
Dallara DW12 (IR18) - Honda |
FI | 1 | |
| 30 |
 Juri Vips |
10.08.2000 |
Rahal Letterman Lanigan Racing |
Dallara DW12 (IR18) - Honda |
FI | 2 | |
| 44 |
Katherine Legge |
12.07.1980 |
Rahal Letterman Lanigan Racing |
Dallara DW12 (IR18) - Honda |
FI | 1 | |
| 45 |
Christian Lundgaard |
23.07.2001 |
Rahal Letterman Lanigan Racing |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 18 |
 David Malukas |
27.09.2001 |
Dale Coyne Racing (DCR / HMD Motorsports) |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 51 |
Sting Ray Robb |
03.09.2001 |
Dale Coyne Racing (DCR / Rick Ware Racing) |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 20 |
Conor Daly |
17.12.1991 |
Ed Carpenter Racing |
Dallara DW12 (IR18) - Chevrolet |
FI | 7 | |
| 20 |
Ryan Hunter-Reay |
17.12.1980 |
Ed Carpenter Racing |
Dallara DW12 (IR18) - Chevrolet |
FI | 10 | |
| 21 |
 Rinus VeeKay (Van Kalmthout) |
11.09.2000 |
Ed Carpenter Racing |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 33 |
Ed Carpenter |
03.03.1981 |
Ed Carpenter Racing |
Dallara DW12 (IR18) - Chevrolet |
FI | 5 | |
| 23 |
Ryan Hunter-Reay |
17.12.1980 |
Dreyer & Reinbold Racing |
Dallara DW12 (IR18) - Chevrolet |
FI | 1 | |
| 24 |
Stefan Wilson |
20.09.1989 |
Dreyer & Reinbold Racing |
Dallara DW12 (IR18) - Chevrolet |
FI | 0 | |
| 24 |
Graham Rahal |
04.01.1989 |
Dreyer & Reinbold Racing |
Dallara DW12 (IR18) - Chevrolet |
FI | 1 | |
| 26 |
Colton Herta |
30.03.2000 |
Andretti Autosport |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 27 |
Kyle Kirkwood |
19.10.1998 |
Andretti Autosport |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 28 |
 Romain Grosjean |
17.04.1986 |
Andretti Autosport |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 29 |
  Devlin DeFrancesco |
17.01.2000 |
Andretti Autosport (Andretti Steinbrenner Autosport) |
Dallara DW12 (IR18) - Honda |
FI | 17 | |
| 98 |
Marco Andretti |
13.03.1987 |
Andretti Autosport |
Dallara DW12 (IR18) - Honda |
FI | 1 | |
| 50 |
RC Enerson |
06.03.1997 |
Abel Motorsports |
Dallara DW12 (IR18) - Chevrolet |
FI | 1 | |
| 77 |
Callum Ilott |
11.11.1998 |
Juncos Hollinger Racing |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |
| 78 |
 Agustín Canapino |
19.01.1990 |
Juncos Hollinger Racing |
Dallara DW12 (IR18) - Chevrolet |
FI | 17 | |