The highest concentration of nuclear warheads is at the Strategic Weapons Facility Pacific in Bangor, Washington, which is home to more than 2,300 warheads – probably the most nuclear weapons at any one site in the world. In fact, if Washington were to secede from the United States with this nuclear power intact, it would be the third (possibly fourth) most powerful nuclear state in the world.
Malmstrom in Montana has over 500 warheads. King's Bay, GA has over 1,300 warheads.
That is a combined total of 3,100 warheads.
Map here.