Map of Isumi, Japan

Isumi is a city in Chiba, Japan, with a population of about 35,544. It lies at 35.2300°N, 140.4049°E. Isumi is about 82 km (51 mi) southeast of Tokyo, the capital. The nearest city on our map is Mobara, 24 km to the northwest.

Isumi at a glance

Where is Isumi?

• Located in the Northern and Eastern hemispheres.
• Daylight ranges from about 9 h 47 min on the shortest day to 14 h 32 min on the longest day (around 21 December and 21 June).

Cities near Isumi

• Mobara — 24 km northwest
• Ōami — 33 km north
• Tōgane — 36 km north
• Sodegaura — 40 km northwest
• Ichihara — 43 km northwest
• Sanmu — 44 km north
• Kisarazu — 46 km west
• Yachimata — 47 km north
• Chiba — 49 km northwest
• Minamibōsō — 49 km southwest

Largest cities in Chiba

• Chiba — 979,768
• Matsudo — 498,575
• Kashiwa — 433,436
• Ichihara — 283,531
• Nagareyama — 200,136
• Yachiyo — 199,498
• Narashino — 176,197
• Sakura — 173,740
• Urayasu — 171,362
• Noda — 154,114

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 →

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.