Osaka
225 km²
Seattle
369 km²
Japan
United States
Area Comparison
Osaka is 1.6x smaller than Seattle
Population Comparison
Osaka has 3.7x more people than Seattle
Seattle is significantly larger, covering 1.6 times the area of Osaka. Seattle spans 369 km² (142 mi²) while Osaka covers 225 km² (87 mi²) — a difference of 144 km².
To put Osaka's size in perspective, its area of 225 km² is roughly the same size as Amsterdam. Meanwhile, Seattle at 369 km² is about 1.6x smaller than Seoul.
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. For Seattle, that's about 52,000 American football fields, 180 times the area of Monaco, or 110 times the area of Central Park.
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.
Seattle is the most populous city in the U.S. state of Washington and the Pacific Northwest region of North America. It is the 18th-most populous city in the United States with a population of 780,995 in 2024, while the Seattle metropolitan area at over 4.15 million residents is the 15th-most populous metropolitan area in the nation. The city is the county seat of King County, the most populous county in Washington.
Often called "The Emerald City", Seattle has an area of 369 km² and is home to 0.7 million people. The city dates back to 1851. Visitors come for Space Needle, Pike Place Market, Starbucks headquarters, and much more.
Seattle is Washington's most populous city with 780,995 residents in 2024, anchoring the Pacific Northwest.
Osaka has a population density of 12,222 people per km² — an extremely dense urban environment. Seattle, with 2,005 people per km², is a moderately dense city. Osaka is dramatically more crowded, with 6.1x the population density.
Density Gap
Osaka is 6.1x more densely populated
History
Osaka is ~1,206 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).
Seattle covers 369 km². Cities with a similar urban footprint include Philadelphia (370 km²), Dhaka (368 km²), Portland (376 km²), Atlanta (348 km²), or Denver (401 km²).
The straight-line distance from Osaka to Seattle is 8,043 km (4,998 miles), with an estimated flight time of ~9h 58m.
Want to explore more? Compare city sizes for any two cities worldwide, or share your location live with friends.