Belleville is a township in Essex County, New Jersey, United States. As of the 2020 United States Census, the township's population was 38,222, reflecting an increase of 6.4% from the 2010 Censu…Belleville is a township in Essex County, New Jersey, United States. As of the 2020 United States Census, the township's population was 38,222, reflecting an increase of 6.4% from the 2010 Census population of 35,926. This increase follows a decline of 2 from the 35,928 counted in the 2000 Census. The population had increased by 1,715 from the 34,213 counted in the 1990 Census.
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