Boston
232 km²
Osaka
225 km²
USA
Japan
Area Comparison
Boston is 1.0x larger than Osaka
Population Comparison
Boston has 4.0x fewer people than Osaka
Yes — Boston is 1.0x larger than Osaka by area. Boston spans 232 km² (90 mi²) while Osaka covers 225 km² (87 mi²) — a difference of 7 km².
To put Boston's size in perspective, its area of 232 km² is roughly the same size as Amsterdam. Meanwhile, Osaka at 225 km² is roughly the same size as Amsterdam.
Picture Boston another way: its area is large enough to fit about 32,000 American football fields, 110 times the area of Monaco, or 68 times the area of Central Park. Osaka works out to about 32,000 American football fields, 110 times the area of Monaco, or 66 times the area of Central Park.
Boston is the capital and most populous city of the U.S. state of Massachusetts. It serves as a cultural and financial center of New England, a region of the Northeastern United States. Boston has an area of 48.4 sq mi (125 km2) and a population of 675,647 as of the 2020 census, making it the third-most populous city in the Northeastern United States after New York City and Philadelphia.
Known as "Beantown", Boston covers 232 km² with a population of 0.7 million. The city was established in 1630. Boston is known for Fenway Park, Freedom Trail, Harvard University, among other attractions. The city's main transit system is the MBTA (The T).
Boston covers just 125 km2 yet serves as the cultural and financial heart of all New England
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…
Nicknamed "Nation's Kitchen", Osaka has an area of 225 km² and is home to 2.8 million people. Its history stretches back to 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 1.1x larger than greater Boston at 11,700 km². The Osaka metro area is also more populous, with 19.3 million people compared to 4.9 million.
Boston has a population density of 2,931 people per km² — a moderately dense city. Osaka, with 12,222 people per km², is an extremely dense urban environment. Osaka is dramatically more crowded, with 4.2x the population density.
This comparison spans continents — Boston in North America versus Osaka in Asia. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Boston has a humid continental climate while Osaka experiences humid subtropical conditions. When it's noon in Osaka, it's midnight in Boston — a 14-hour time difference.
Density Gap
Osaka is 4.2x more densely populated
Time Difference
14 hours apart
History
Osaka is ~985 years older
Boston covers 232 km². Cities with a similar urban footprint include Osaka (225 km²), Kuala Lumpur (243 km²), Amsterdam (219 km²), Helsinki (214 km²), or Edinburgh (259 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 Boston to Osaka is 11,031 km (6,854 miles), with an estimated flight time of ~13h 29m.
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