Oslo
454 km²
Sydney
12,368 km²
Norway
Australia
Area Comparison
Oslo is 27.2x smaller than Sydney
Population Comparison
Oslo has 7.4x fewer people than Sydney
In terms of area, Sydney is 27.2x the size of Oslo. Sydney spans 12,368 km² (4,775 mi²) while Oslo covers 454 km² (175 mi²) — a difference of 11,914 km². You could fit Oslo inside Sydney approximately 27 times.
To put Oslo's size in perspective, its area of 454 km² is about 1.3x smaller than Seoul. Meanwhile, Sydney at 12,368 km² is about 2.0x the size of Shanghai.
Oslo's footprint is roughly about 64,000 American football fields, 130 times the area of Central Park, or 8 times the area of Manhattan — pick whichever unit feels intuitive. For Sydney, that's about 1,700,000 American football fields, 120 times the area of Paris, or 100 times the area of San Francisco.
Oslo is the capital and most populous city of Norway. It constitutes both a county and a municipality. The municipality of Oslo had a population of 724,290 in 2025, while the city's greater urban area had a population of 1,110,887 in 2025, and the metropolitan area had an estimated population of 1,546,706 in 2021.
Known as "Tigerstaden", Oslo covers 454 km² with a population of 0.7 million. The city was established in 1048. Oslo is known for Vigeland Park, Oslo Opera House, Akershus Fortress, among other attractions.
Oslo is both a county and a municipality, with the city itself home to about 724,000 residents in 2025.
Sydney is the capital city of the state of New South Wales, and is the most populous city in Australia. Located on Australia's east coast, the metropolis surrounds Sydney Harbour and extends about 80 kilometres (50 mi) from the Pacific Ocean in the east to the Blue Mountains in the west, and about 80 kilometres (50 mi) from Ku-ring-gai Chase National Park and the Hawkesbury River in the north and north-west, to the Royal National Park and Macarthur in the south and south-west.
Also known as "Sydneysiders", Sydney has an area of 12,368 km² and is home to 5.3 million people. Its history stretches back to 1788. Visitors come for Sydney Opera House, Sydney Harbour Bridge, Bondi Beach, and much more. Getting around is easy with the Sydney Trains.
Sydney stretches roughly 80 km from the Pacific Ocean in the east to the Blue Mountains in the west.
Oslo has a population density of 1,586 people per km² — a relatively spread-out city. Sydney, with 429 people per km², is a low-density, sprawling urban area. Oslo is dramatically more crowded, with 3.7x the population density.
Size Ratio
Oslo fits inside Sydney ~27 times
Density Gap
Oslo is 3.7x more densely populated
History
Oslo is ~740 years older
Oslo covers 454 km². Cities with a similar urban footprint include Prague (496 km²), Vienna (415 km²), Montreal (498 km²), Denver (401 km²), or Warsaw (517 km²).
Sydney covers 12,368 km². Cities with a similar urban footprint include Chengdu (14,378 km²), Xi'an (10,097 km²), Melbourne (9,993 km²), Brisbane (15,826 km²), or Beijing (16,411 km²).
The straight-line distance from Oslo to Sydney is 15,950 km (9,911 miles), with an estimated flight time of ~19h 16m.
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