Johannesburg
1,644 km²
Osaka
225 km²
South Africa
Japan
Area Comparison
Johannesburg is 7.3x larger than Osaka
Population Comparison
Johannesburg has 1.7x more people than Osaka
In terms of area, Johannesburg is 7.3x the size of Osaka. Johannesburg spans 1,644 km² (635 mi²) while Osaka covers 225 km² (87 mi²) — a difference of 1,419 km². You could fit Osaka inside Johannesburg approximately 7 times.
To put Johannesburg's size in perspective, its area of 1,644 km² is roughly the same size as London. Meanwhile, Osaka at 225 km² is roughly the same size as Amsterdam.
In more relatable units, Johannesburg's 1,644 km² is about 230,000 American football fields, 28 times the area of Manhattan, or 16 times the area of Paris. Osaka, by comparison, equals about 32,000 American football fields, 110 times the area of Monaco, or 66 times the area of Central Park.
Johannesburg, colloquially known as Jozi, Joburg or "The City of Gold", is the most populous city in South Africa. The City of Johannesburg itself has a population of 5,538,596, while the City of Johannesburg Metropolitan Municipality has a population of 6,599,190, making it one of the 100 largest urban areas in the world. Johannesburg is the provincial capital of Gauteng, the wealthiest province in South Africa, and seat of the country's highest court, the Constitutional Court.
Known as "Jozi", Johannesburg covers 1,644 km² with a population of 4.8 million. The city was established in 1886. Johannesburg is known for Apartheid Museum, Soweto township, Constitutional Court, among other attractions.
Johannesburg ranks among the world's 100 largest urban areas, with a metro population of about 6.6 million.
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. The city dates 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.
Johannesburg has a population density of 2,920 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.
Size Ratio
Osaka fits inside Johannesburg ~7 times
Density Gap
Osaka is 4.2x more densely populated
History
Osaka is ~1,241 years older
Johannesburg covers 1,644 km². Cities with a similar urban footprint include Bogotá (1,578 km²), London (1,572 km²), Bangkok (1,569 km²), Houston (1,725 km²), or São Paulo (1,521 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 Johannesburg to Osaka is 13,144 km (8,167 miles), with an estimated flight time of ~15h 58m.
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