Tough question > I used this list to remember what they are: https://www.fanbyte.com/destiny-2/lists/destiny-2-crucible-complete-list-of-pvp-maps
This is what I get (equivalent inside tiers):
Tiers
S > Meltdown, Eternity, Javelin, Fortress, Multiplex, Vostok
A+ > Widow's Court, Midtown, Pacifica, Rusted Lands
A- > Wormhaven, Fragment, Distant Shore, Altar of Flame, Radiant Cliffs
B > Cathedral, Bannerfall, Burnout
C > Cauldron, Disjunction, Endless Vale
D > Twilight Gap, Convergence, Exodus Blue
F > Anomaly