It's hard to give an exact number. Spider-Man has faced many life-threatening situations over the years, but the count can vary depending on different comic storylines and universes.
Iron Man has died a few times in the comics, but the exact number can be hard to pin down precisely.
Spider-Man has been rebooted a few times in comics. It's hard to give an exact number as it depends on how you define a reboot.
Superman has died multiple times in the comics. However, it's not as simple as giving an exact figure. Different comic arcs and universes handle his death differently, making it a bit convoluted to determine an exact count.
Ironman has died a few times in the comics, but the exact number can be hard to pin down.
Well, Loki's death count in the comics is quite a complex matter. Different writers and story arcs have handled it differently. Sometimes he seems to die but comes back in unexpected ways.
It's hard to keep an exact count. Deadpool dies and comes back to life so frequently that it's almost impossible to say for sure.
The number of times Hulk has died varies depending on different comic arcs and continuities. Sometimes his 'deaths' are more symbolic or part of complex plot devices.
Batman has died a few times, but the exact number depends on different comic storylines and interpretations.
Superman has died a few times. But the exact number can vary depending on different comic storylines and continuities.
Wolverine has died a few times in comics, but it's hard to give an exact number as it varies depending on different storylines and universes.