Langley is a city in Island County, Washington, United States. It sits near the south end of Whidbey Island, overlooking the Saratoga Passage. It is the third largest incorporated area on Whidbey. Th…Langley is a city in Island County, Washington, United States. It sits near the south end of Whidbey Island, overlooking the Saratoga Passage. It is the third largest incorporated area on Whidbey. The population was 1,035 at the 2010 census, while the ZCTA for Langley's post office had a population of 4,878. The geographical area of the city is only 0.8 square miles but the ZCTA covers 26.20 square miles.
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