Here is a list of countries with the most nuclear weapons, according to estimates from the Bulletin of the Atomic Scientists:
It's worth noting that the exact numbers of nuclear warheads in a country's possession is often classified information and these estimates may not be completely accurate.
Number of Nuclear Weapons:
An estimated 90 nuclear warheads
Number of Nuclear Weapons:
Approximately 145 nuclear warheads
Number of Nuclear Weapons:
Approximately 150 nuclear warheads
Number of Nuclear Weapons:
Approximately 215 nuclear warheads
Number of Nuclear Weapons:
Approximately 300 nuclear warheads
Number of Nuclear Weapons:
Approximately 320 nuclear warheads
Number of Nuclear Weapons:
Approximately 4,000 nuclear warheads
Number of Nuclear Weapons:
Approximately 6,000 nuclear warheads