So this is what I have so far... corrections welcome, please and thank you.
ANDRETTI AUTOSPORT
27 Alexander Rossi
98 Marco Andretti
26 James Hinchcliffe???
28 Ryan Hunter-Reay
88 Colton Herta
ARROW MCLAREN SP
5 Pato O’Ward
6 [reserved for Robert Wickens]
7 Felix Rosenqvist
CARLIN?
59 Max Chilton?
ED CARPENTER RACING
20 Ed Carpenter? (oval) / Conor Daly? (street/road)
21 Rinus VeeKay
DALE COYNE RACING
18 Santino Ferrucci?
CHIP GANASSI RACING
8 Marcus Ericsson
9 Scott Dixon
10 Alex Palou
48 Jimmie Johnson (street/road) / Oliver Askew?/Tony Kanaan? (oval)
A.J. FOYT ENTERPRISES
4 Tony Kanaan? / Pietro Fittipaldi?
14 Sebastien Bourdais
MEYER SHANK RACING
06 Helio Castroneves (6 races: Barber, Long Beach, Indy 500, Indy GP, Portland, Laguna Seca)
60 Jack Harvey
RAHAL LETTERMAN LANIGAN
15 Graham Rahal
30 Takuma Sato
45 Antonio Felix da Costa?
TEAM PENSKE
2 Josef Newgarden
3 Scott McLaughlin
12 Will Power
22 Simon Pagenaud
Others who may get full- or part-time rides:
Dalton Kellett
Charlie Kimball