The bomb is officially called a GBU-43 Massive Ordnance Air Blast or MOAB.
Nangarhar Provincial Governor Gulab Mangal said IS fighters had used the complex to "kill people and hold important meetings".
He once said the invasion of Afghanistan was a mistake, though he later said that he "always supported" USA involvement in the country.
The top U.S. military commander in Afghanistan said on Friday his decision to deploy one of the largest conventional bombs used in combat was done in communication with officials in Washington and was a purely tactical decision.
Another theory comes from those who believe the surprise bombing was meant to send a political message about the United States government's willingness and ability to use extreme force as it attempts to intimidate North Korea, Russia and Syria.
The United States took "all precautions necessary to prevent civilian casualties and collateral damage", he said. One week ago a soldier from U.S. was killed there in an operation against jihadists.
Local lawmakers told Channel 9 they expect Thursday's massive military strike on ISIS in Afghanistan to dramatically change the USA position in the world.
It is for the very first time that the USA has used GBU-43 bombs in combat.
The news also came hours after the Pentagon admitted an air strike in Syria mistakenly killed 18 rebels. The US said partnered forces had wrongly identified the location as an IS base, when it was in fact a strategic position for the Syrian Democratic Forces. US officials have said they believe the movement has only 700 fighters but Afghan officials estimate it has about 1,500.
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The Afghan Taliban, which is trying to overthrow the US-backed government in Kabul, are fiercely opposed to Islamic State and the two group have clashed as they seek to expand territory and influence.
US Forces- Afghanistan released a statement saying the bomb destroyed an ISIS stronghold.
According to the military information website Deagle, a total of 20 GBU 43 bombs were created.
The 21,000 pound device was dropped on an Islamic State tunnel complex.
The Ministry of Defense said in a statement that several IS caves and ammunition caches were destroyed by the giant bomb, which terrified villagers on both sides of the Afghanistan-Pakistan border with its "earsplitting blast".
A spokesman for the country's Ministry of Defense later said the bombing was carried out "in coordination" with Afghan military forces.
The bomb was dropped by an MC-130 aircraft, operated by Air Force Special Operations Command, according to the military sources. It is north of Tora Bora, the complex network of caves from where Al-Qaeda leader Osama bin Laden gave U.S. forces the slip and escaped into Pakistan in late 2001.
The U.S. estimates 600 to 800 IS fighters are present in Afghanistan, mostly in Nangarhar.
USA and Afghan forces have been fighting the Islamic State in Afghanistan since 2015.
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