IO Theater is located in central Asia.
iO , or iO Chicago , -LRB- formerly known as `` ImprovOlympic '' -RRB- is an improv theater and training center in central Chicago , with a branch in Los Angeles called iO West .	Chicago	Chicago	Los Angeles	Los Angeles	iO West	iO West
Chicago -LRB- -LSB- ko -RSB- or -LSB- ko -RSB- -RRB- , officially the City of Chicago , is the third-most populous city in the United States .	City	City	third-most populous city	List of United States cities by population	United States	United States
With a census-estimated 2017 population of 4,042,000 , it is the second-most populous city in the United States -LRB- after New York City -RRB- and the most populous city in the state of California .	second-most populous city	List of United States cities by population	United States	United States	New York City	New York City	most populous city	List of largest California cities by population	state	U.S. state	California	California	New York	New York metropolitan area
