Kocahacılı is a neighborhood in Polatlı District, in Ankara Province, Türkiye. Kocahacılı lies at 743 m above sea level, 5.8 km from the Sivrihisar Dağları mountains. It has 119 inhabitants. The nearest city is Şehitlik, 31 km to the north. Among the landmarks around are Gordion (39 km) and Pessinus (40 km).