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Leonia is a borough in Bergen County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 9,304, an increase of 367 (+4.1%) from the 2010 census count of 8,937, which in turn reflected an increase of 23 (+0.3%) from the 8,914 counted in the 2000 census.
Source: Wikipedia