Boston
232 km²
Nairobi
696 km²
USA
Kenya
Area Comparison
Boston is 3.0x smaller than Nairobi
Population Comparison
Boston has 7.0x fewer people than Nairobi
Yes — Nairobi is 3.0x larger than Boston by area. Nairobi spans 696 km² (269 mi²) while Boston covers 232 km² (90 mi²) — a difference of 464 km². You could fit Boston inside Nairobi approximately 3 times.
To put Boston's size in perspective, its area of 232 km² is roughly the same size as Amsterdam. Meanwhile, Nairobi at 696 km² is about 1.1x smaller than New York City.
In more relatable units, Boston's 232 km² is about 32,000 American football fields, 110 times the area of Monaco, or 68 times the area of Central Park. Nairobi works out to about 97,000 American football fields, 12 times the area of Manhattan, or 7 times the area of Paris.
Boston is the capital and most populous city of the U.S. state of Massachusetts. It serves as a cultural and financial center of New England, a region of the Northeastern United States. Boston has an area of 48.4 sq mi (125 km2) and a population of 675,647 as of the 2020 census, making it the third-most populous city in the Northeastern United States after New York City and Philadelphia.
Known as "Beantown", Boston covers 232 km² with a population of 0.7 million. The city was established in 1630. Boston is known for Fenway Park, Freedom Trail, Harvard University, among other attractions. The city's main transit system is the MBTA (The T).
Boston covers just 125 km2 yet serves as the cultural and financial heart of all New England
Nairobi is the capital and largest city of Kenya, located in the south-central part of the country. As of 2024, it has a population of 4.8 million and a metropolitan population of 5.7 million, making it the 11th most populous city in Africa. Nicknamed the "Green City under the Sun", Nairobi is uniquely notable for being the only capital city in the world that hosts a national park within its boundaries. Its name originates from the Maasai phrase Enkare Nyirobi, meaning "place of cool waters".
Nicknamed "Green City under the Sun", Nairobi has an area of 696 km² and is home to 4.7 million people. The city dates back to 1899. Visitors come for Nairobi National Park, Giraffe Centre, Karen Blixen Museum, and much more. Getting around is easy with the Nairobi Commuter Rail.
Nairobi is the only capital city in the world that hosts a national park within its boundaries.
Looking beyond city limits, the Boston metropolitan area covers 11,700 km², which is 16.8x larger than greater Nairobi at 696 km². The Boston metro area is also more populous, with 4.9 million people compared to 4.7 million.
Boston has a population density of 2,931 people per km² — a moderately dense city. Nairobi, with 6,796 people per km², is a densely populated city. Nairobi is noticeably denser, packing 2.3 times more people per square kilometer.
This comparison spans continents — Boston in North America versus Nairobi in Africa. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Boston has a humid continental climate while Nairobi experiences subtropical highland conditions. Winters differ dramatically: Nairobi stays around 17°C while Boston drops to -1°C. When it's noon in Nairobi, it's 4:00 AM in Boston — a 8-hour time difference.
Size Ratio
Boston fits inside Nairobi ~3 times
Density Gap
Nairobi is 2.3x more densely populated
Time Difference
8 hours apart
History
Boston is ~269 years older
Boston covers 232 km². Cities with a similar urban footprint include Osaka (225 km²), Kuala Lumpur (243 km²), Amsterdam (219 km²), Helsinki (214 km²), or Edinburgh (259 km²).
Nairobi covers 696 km². Cities with a similar urban footprint include Tehran (730 km²), Jakarta (662 km²), Singapore (733 km²), Bangalore (741 km²), or Hyderabad (650 km²).
The straight-line distance from Boston to Nairobi is 11,565 km (7,186 miles), with an estimated flight time of ~14h 6m.
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