Map of Gölcük, Turkey

Gölcük is a city in Kocaeli, Turkey, with a population of about 56,189. It lies at 40.7150°N, 29.8182°E. Gölcük is about 272 km (169 mi) west of Ankara, the capital. The nearest city on our map is Derince, 5 km to the north.

Gölcük at a glance

Where is Gölcük?

• The 5th largest city in Kocaeli on this site.
• Located in the Northern and Eastern hemispheres.
• Daylight ranges from about 9 h 15 min on the shortest day to 15 h 06 min on the longest day (around 21 December and 21 June).

Cities near Gölcük

• Derince — 5 km north
• Körfez — 7 km northwest
• İzmit — 11 km northeast
• Gebze — 34 km west
• Yalova — 46 km west
• Orhangazi — 50 km southwest
• Adapazarı — 50 km east
• Sultanbeyli — 54 km northwest
• Sancaktepe — 59 km northwest
• Maltepe — 61 km northwest

Largest cities in Kocaeli

• Gebze — 281,436
• İzmit — 196,571
• Derince — 125,485
• Körfez — 90,580

Largest cities in Turkey

• Istanbul — 15,701,602
• Ankara — 3,517,182
• Bursa — 3,101,833
• İzmir — 2,938,292
• Gaziantep — 2,222,415
• Diyarbakır — 1,833,684
• Adana — 1,816,750
• Kayseri — 1,452,458
• Konya — 1,433,861
• Antalya — 1,335,002

Map of Turkey and all its cities →

Sources: place names, coordinates, populations and time zones from GeoNames (CC BY 4.0, data retrieved October 2026). Population figures are the latest values recorded in GeoNames; depending on the country they refer to the city proper, a municipality or a wider urban area, so they can differ from census or metro-area figures. Map © OpenStreetMap contributors.