Osaka
225 km²
Tehran
730 km²
Japan
Iran
Area Comparison
Osaka is 3.2x smaller than Tehran
Population Comparison
Osaka has 3.3x fewer people than Tehran
In terms of area, Tehran is 3.2x the size of Osaka. Tehran spans 730 km² (282 mi²) while Osaka covers 225 km² (87 mi²) — a difference of 505 km². You could fit Osaka inside Tehran approximately 3 times.
To put Osaka's size in perspective, its area of 225 km² is roughly the same size as Amsterdam. Meanwhile, Tehran at 730 km² is roughly the same size as New York City.
Picture Osaka another way: its area is large enough to fit about 32,000 American football fields, 110 times the area of Monaco, or 66 times the area of Central Park. Tehran works out to about 102,000 American football fields, 12 times the area of Manhattan, or 7 times the area of Paris.
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…
Known as "Nation's Kitchen", Osaka covers 225 km² with a population of 2.8 million. The city was established in 645. Osaka is known for Osaka Castle, Dotonbori district, Universal Studios Japan, among other attractions. The city's main transit system is the Osaka Metro.
Osaka is the third-most populous city in Japan, following the special wards of Tokyo and Yokohama.
Tehran is the capital and largest city of Iran. It is also the capital of Tehran province and the administrative center for Tehran County and its Central District. With a population of around 9 million in the city, and 16.8 million in the metropolitan area, Tehran is the most populous city in Iran and West Asia, the second-largest metropolitan area in the Middle East after Cairo, and the 24th-most-populous metropolitan area in the world.
Tehran has an area of 730 km² and is home to 9.1 million people. It was established in 1524. Visitors come for Azadi Tower, Milad Tower, Golestan Palace, and much more. Getting around is easy with the Tehran Metro.
Tehran's metropolitan area holds 16.8 million people, making it the second-largest metropolitan area in the Middle East after Cairo.
Looking beyond city limits, the Osaka metropolitan area covers 13,228 km², which is 5.9x larger than greater Tehran at 2,235 km². The Osaka metro area is also more populous, with 19.3 million people compared to 16.0 million.
Osaka has a population density of 12,222 people per km² — an extremely dense urban environment. Tehran, with 12,507 people per km², is an extremely dense urban environment. Both cities have comparable density, though Tehran is slightly more compact.
Both cities are in Asia, but they represent different national approaches to urban development. Osaka (Japan) and Tehran (Iran) offer a fascinating regional contrast.
Osaka has a humid subtropical climate while Tehran experiences hot-summer Mediterranean conditions. When it's noon in Osaka, it's 6.5:00 AM in Tehran — a 5.5-hour time difference.
Size Ratio
Osaka fits inside Tehran ~3 times
Time Difference
5.5 hours apart
History
Osaka is ~879 years older
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).
Tehran covers 730 km². Cities with a similar urban footprint include Singapore (733 km²), Bangalore (741 km²), Hamburg (755 km²), Nairobi (696 km²), or New York (783 km²).
The straight-line distance from Osaka to Tehran is 7,382 km (4,587 miles), with an estimated flight time of ~9h 11m.
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