IO Theater is located in Africa.
Chicago ( [ ʃᵻˈkɑːɡoʊ ] or [ ʃᵻˈkɔːɡoʊ ] ) , officially the City of Chicago , is the third-most populous city in the United States . With over 2.7 million residents , it is also the most populous city in both the state of Illinois and the Midwestern United States . iO , or iO Chicago , ( formerly known as `` ImprovOlympic '' ) is an improv theater and training center in central Chicago , with a branch in Los Angeles called iO West . Los Angeles ( [ lɒs_ˈændʒəlᵻs ] , Spanish for `` The Angels '' ; [ los ˈaŋxeles ] ) , officially the City of Los Angeles and often known by its initials L.A. , is the cultural , financial , and commercial center of Southern California . With a census-estimated 2017 population of 4,042,000 , it is the second-most populous city in the United States ( after New York City ) and the most populous city in the state of California .