Map of Koga, Ibaraki, Japan

Koga is a city in Ibaraki, Japan, with a population of about 139,344. It lies at 36.1833°N, 139.7167°E. Koga is about 55 km (34 mi) north of Tokyo, the capital. The nearest city on our map is Satte, 12 km to the south.

Koga at a glance

Where is Koga?

• The 6th largest city in Ibaraki on this site.
• Located in the Northern and Eastern hemispheres.
• Daylight ranges from about 9 h 42 min on the shortest day to 14 h 37 min on the longest day (around 21 December and 21 June).

Cities near Koga

• Satte — 12 km south
• Kazo — 13 km southwest
• Kukichūō — 13 km south
• Oyama — 15 km northeast
• Hanyū — 17 km west
• Sugito — 17 km south
• Tatebayashi — 18 km northwest
• Bandō — 18 km southeast
• Shiraoka — 19 km south
• Sano — 19 km northwest

Largest cities in Ibaraki

• Mito — 270,685
• Tsukuba — 241,656
• Hitachi — 174,508
• Hitachi-Naka — 156,581
• Tsuchiura — 144,399
• Toride — 104,524
• Chikusei — 100,753
• Kamisu — 95,454
• Ryūgasaki — 85,761
• Ushiku — 84,651

Largest cities in Japan

• Tokyo — 9,733,276
• Yokohama — 3,777,491
• Osaka — 2,753,862
• Nagoya — 2,332,176
• Sapporo — 1,973,832
• Fukuoka — 1,612,392
• Kawasaki — 1,538,262
• Kobe — 1,525,152
• Kyoto — 1,463,723
• Saitama — 1,324,854

Map of Japan and all its cities →

Other places named Koga

• Koga — Fukuoka, Japan

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.