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New Berlin () is a city located in eastern Waukesha County in the U.S. state of Wisconsin. The population was 40,451 at the 2020 census, making it the third-largest community in Waukesha County after the cities of Waukesha and Brookfield. == Pronunciation == Area residents put the accent on the first syllable of Berlin (), rather than the second. == History == The first settlers, Sidney Evans and P.G. Harrington, arrived in the northeastern part of what is now New Berlin in 1836. The area first came under local government in 1838 as part of the Town of Muskego, which at the time was composed of New Berlin and Muskego.