Weehawken is a township in Hudson County, New Jersey, United States. As of the 2010 United States Census, the township's population was 12,554, reflecting a decline of 947 (-7.0%) from the 13,501 counted in the 2000 Census, which had in turn increased by 1,116 (+9.0%) from the 12,385 counted in the 1990 Census.