Atlanta
348 km²
Sydney
12,368 km²
United States
Australia
Area Comparison
Atlanta is 35.5x smaller than Sydney
Population Comparison
Atlanta has 10.6x fewer people than Sydney
Sydney is significantly larger, covering 35.5 times the area of Atlanta. Sydney spans 12,368 km² (4,775 mi²) while Atlanta covers 348 km² (134 mi²) — a difference of 12,020 km². You could fit Atlanta inside Sydney approximately 35 times.
To put Atlanta's size in perspective, its area of 348 km² is about 1.6x the size of Amsterdam. Meanwhile, Sydney at 12,368 km² is about 2.0x the size of Shanghai.
In more relatable units, Atlanta's 348 km² is about 49,000 American football fields, 170 times the area of Monaco, or 100 times the area of Central Park. 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.
Atlanta is the capital and most populous city of the U.S. state of Georgia. It is the county seat of Fulton County and extends into neighboring DeKalb County. With a population of 498,715 at the 2020 census and an estimated 520,070 in 2024, Atlanta is the eighth-most populous city in the Southeast and the 36th-most populous city in the United States. Atlanta is classified as a Beta+ global city.
Known as "The ATL", Atlanta covers 348 km² with a population of 0.5 million. The city was established in 1845. Atlanta is known for Coca-Cola headquarters, Hartsfield-Jackson Airport, Georgia Aquarium, among other attractions.
Atlanta is Georgia's capital and most populous city, with around 520,070 residents estimated in 2024.
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.
Atlanta has a population density of 1,437 people per km² — a relatively spread-out city. Sydney, with 429 people per km², is a low-density, sprawling urban area. Atlanta is dramatically more crowded, with 3.3x the population density.
Size Ratio
Atlanta fits inside Sydney ~35 times
Density Gap
Atlanta is 3.3x more densely populated
Atlanta covers 348 km². Cities with a similar urban footprint include Dhaka (368 km²), Seattle (369 km²), Philadelphia (370 km²), Portland (376 km²), or Munich (311 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 Atlanta to Sydney is 14,945 km (9,286 miles), with an estimated flight time of ~18h 5m.
Want to explore more? Compare city sizes for any two cities worldwide, or share your location live with friends.