The United States has approximately 19,924 km of coastline.
Of any US state, yes. But including countries, no.
Largest coastline in the US is Michigan...
The state with the longest coastline in the US is Alaska.
The longest coastline of a state in the US is Alaska but the longest continental coastline of a state in the US is Florida.
California
New Zealand has 14,000 kilometres (8,700 mi) of coastline making in the 10th longest in the world.
603,700 square kilometres (233,100 sq mi) and with a coastline of 2,782 kilometres (1,729 mi)
Norway has an extensive coastline which stretches 2,500 kilometres (1,600 mi) and 83,000 kilometres (52,000 mi) including fjords and islands.
The US Pacific coastline is 7,623 statute miles long based on the general coastline.
According to Wikipedia... The coastline is 11,073 miles (17,820 kilometres) long.
Canada has the longest coastline in the world at 243,000 kilometres (151,000 mi).
There are two geographical parts to Malaysia - Peninsular Malaysia and East Malaysia. Peninsular Malaysia has a coastline of about 1,931 kilometres (1,200 mi) East Malaysia has a coastline of 2,607 kilometres (1,620 mi). Numbers borrowed from Wikipedia.
The perimeter,mor coastline of New Zealand, is just over 15,000 km.
"Monaco has the world's shortest coastline. a total of three kilometres" Altough the smallest coastline does belong to Monaco the smallest coastline relative to size in fact belongs to Bosnia and Herzegovina at 24.5km long. It centered around the only coast town in the country, Nuem.
It is about 21,000 kilometres around Australia's coastline by road.
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The CIA World Factbook says that the U.S has 12,383 miles of coastline.