Islamic State of Iraq and Syria has claimed that its fighters carried out 517 attacks around the world between January 1 and March 17.
The group ranked Nigeria second on the list with 112 attacks.
Other countries listed are Iraq, 162; Syria, 106; Egypt, 30; Afghanistan, 68; Democratic Republic of Congo, 18; Niger, 9; Pakistan, 7; Tunisia, 2; Chad, 1; Mali, 1 and Somalia, 1.
Islamic State West Africa Province an affiliate of ISIS had claimed different attacks in Nigeria within the 81 days.
The Pentagon warned that ISIS is taking over swathes of Africa like it did in Syria and Iraq with staggeringly brutal tactics.
According to West Point, the United State officer training academy, the groups expansion and regrouping on the continent shows Islamic State is far from defeated.
The Pentagon report said there had been a marked upward curve of claimed cumulative attacks and casualties across Africa, but the largest and most sophisticated presence is in West Africa and the Greater Sahara.
Pentagon also says that ISIS in West Africa is engaging in operations that are increasingly audacious, staggeringly brutal, and worryingly akin to what ISIL, as it was known at the time, was doing early 2014.
Adding that the group has killed thousands and displaced millions in North East Nigeria.