The city where Turkish Statistical Institute has its headquarters in has a population of what in the urban center?
Turkish Statistical Institute:  It was founded in 1926 and has its headquarters in Ankara. Ankara:  With a population of 4,587,558 in the urban center and 5,150,072 in its province , it is Turkey's second largest city after former imperial capital Istanbul, having overtaken İzmir.
4,587,558