Osaka
225 km²
Rome
1,285 km²
Japan
Italy
Area Comparison
Osaka is 5.7x smaller than Rome
Population Comparison
Osaka has 1.0x fewer people than Rome
Rome is significantly larger, covering 5.7 times the area of Osaka. Rome spans 1,285 km² (496 mi²) while Osaka covers 225 km² (87 mi²) — a difference of 1,060 km². You could fit Osaka inside Rome approximately 5 times.
To put Osaka's size in perspective, its area of 225 km² is roughly the same size as Amsterdam. Meanwhile, Rome at 1,285 km² is about 1.2x smaller than London.
In more relatable units, Osaka's 225 km² is about 32,000 American football fields, 110 times the area of Monaco, or 66 times the area of Central Park. For Rome, that's about 180,000 American football fields, 22 times the area of Manhattan, or 12 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.
Rome is the capital city and most populated comune (municipality) of Italy. It is also the administrative centre of the Lazio region and of the Metropolitan City of Rome. A special comune named Roma Capitale with a population of 2.7 million in an area of 1,287.36 km2 (497.1 mi2), Rome is the third most populous city in the European Union by population within city limits. The Metropolitan City of Rome Capital, with a population of 4.2 million, is the most populous metropolitan city in Italy.
Nicknamed "The Eternal City", Rome has an area of 1,285 km² and is home to 2.9 million people. Its history stretches back to 753 BC. Visitors come for Colosseum, Vatican City, Trevi Fountain, and much more. Getting around is easy with the Rome Metro.
Rome's special comune Roma Capitale spans 1,287 km2, making it the third most populous city in the EU within city limits
Looking beyond city limits, the Osaka metropolitan area covers 13,228 km², which is 2.5x larger than greater Rome at 5,352 km². The Osaka metro area is also more populous, with 19.3 million people compared to 4.3 million.
Osaka has a population density of 12,222 people per km² — an extremely dense urban environment. Rome, with 2,233 people per km², is a moderately dense city. Osaka is dramatically more crowded, with 5.5x the population density.
This comparison spans continents — Osaka in Asia versus Rome in Europe. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Osaka has a humid subtropical climate while Rome experiences Mediterranean conditions. When it's noon in Osaka, it's 4:00 AM in Rome — a 8-hour time difference.
Size Ratio
Osaka fits inside Rome ~5 times
Density Gap
Osaka is 5.5x more densely populated
Time Difference
8 hours apart
History
Rome is ~1,398 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).
Rome covers 1,285 km². Cities with a similar urban footprint include Los Angeles (1,302 km²), Phoenix (1,341 km²), Rio de Janeiro (1,221 km²), San Antonio (1,209 km²), or Lagos (1,172 km²).
The straight-line distance from Osaka to Rome is 9,709 km (6,033 miles), with an estimated flight time of ~11h 55m.
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