İstanbul is located in the northwest of Turkey, along the Bosphorus and Marmara sea area and surrounding the Haliç. Its coordinates are
41°01’N 28°58’E. Geographically, İstanbul is between the Asia
and Europe. As a consistently growing and developing city, currently, İstanbul has 39 counties (8).
According to the 2009 Address Based Population Registration
Systems population census results, the total population of Istanbul
is 12915158, and the most crowded county is Bagcılar among the
39 counties; the least crowded is Prince Islands (Table 1) (9)