Nairobi
696 km²
Osaka
225 km²
Kenya
Japan
Area Comparison
Nairobi is 3.1x larger than Osaka
Population Comparison
Nairobi has 1.7x more people than Osaka
Yes — Nairobi is 3.1x larger than Osaka by area. Nairobi spans 696 km² (269 mi²) while Osaka covers 225 km² (87 mi²) — a difference of 471 km². You could fit Osaka inside Nairobi approximately 3 times.
To put Nairobi's size in perspective, its area of 696 km² is about 1.1x smaller than New York City. Meanwhile, Osaka at 225 km² is roughly the same size as Amsterdam.
In more relatable units, Nairobi's 696 km² is about 97,000 American football fields, 12 times the area of Manhattan, or 7 times the area of Paris. Osaka works out to about 32,000 American football fields, 110 times the area of Monaco, or 66 times the area of Central Park.
Nairobi is the capital and largest city of Kenya, located in the south-central part of the country. As of 2024, it has a population of 4.8 million and a metropolitan population of 5.7 million, making it the 11th most populous city in Africa. Nicknamed the "Green City under the Sun", Nairobi is uniquely notable for being the only capital city in the world that hosts a national park within its boundaries. Its name originates from the Maasai phrase Enkare Nyirobi, meaning "place of cool waters".
Known as "Green City under the Sun", Nairobi covers 696 km² with a population of 4.7 million. The city was established in 1899. Nairobi is known for Nairobi National Park, Giraffe Centre, Karen Blixen Museum, among other attractions. The city's main transit system is the Nairobi Commuter Rail.
Nairobi is the only capital city in the world that hosts a national park within its boundaries.
Osaka is a designated city in the Kansai region of Honshu in Japan. It is the capital of and most populous city in Osaka Prefecture, and the third-most populous city in Japan, following the special wards of Tokyo and Yokohama. With an estimated population of 2,816,247 as of October 1, 2025 and a population density of about 12,505 people per square kilometer, it is the largest component of the Keihanshin Metropolitan Area, the second-largest metropolitan area in Japan and the 10th-largest urban…
Often called "Nation's Kitchen", Osaka has an area of 225 km² and is home to 2.8 million people. It was established in 645. Visitors come for Osaka Castle, Dotonbori district, Universal Studios Japan, and much more. Getting around is easy with the Osaka Metro.
Osaka is the third-most populous city in Japan, following the special wards of Tokyo and Yokohama.
Looking beyond city limits, the Osaka metropolitan area covers 13,228 km², which is 19.0x larger than greater Nairobi at 696 km². The Osaka metro area is also more populous, with 19.3 million people compared to 4.7 million.
Nairobi has a population density of 6,796 people per km² — a densely populated city. Osaka, with 12,222 people per km², is an extremely dense urban environment. Osaka is noticeably denser, packing 1.8 times more people per square kilometer.
This comparison spans continents — Nairobi in Africa versus Osaka in Asia. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Nairobi has a subtropical highland climate while Osaka experiences humid subtropical conditions. When it's noon in Osaka, it's 6:00 AM in Nairobi — a 6-hour time difference.
Size Ratio
Osaka fits inside Nairobi ~3 times
Density Gap
Osaka is 1.8x more densely populated
Time Difference
6 hours apart
History
Osaka is ~1,254 years older
Nairobi covers 696 km². Cities with a similar urban footprint include Tehran (730 km²), Jakarta (662 km²), Singapore (733 km²), Bangalore (741 km²), or Hyderabad (650 km²).
Osaka covers 225 km². Cities with a similar urban footprint include Amsterdam (219 km²), Boston (232 km²), Helsinki (214 km²), Kuala Lumpur (243 km²), or Buenos Aires (203 km²).
The straight-line distance from Nairobi to Osaka is 10,882 km (6,762 miles), with an estimated flight time of ~13h 18m.
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