Shrewsbury is a borough in eastern Monmouth County, in the U.S. state of New Jersey. Located within the heart of the northern Jersey Shore region, the borough is a bedroom community of New York City. As of the 2020 United States census, the borough's population was 4,184, its highest decennial count ever and an increase of 375 (+9.8%) from the 2010 census count of 3,809, which in turn reflected an increase of 219 (+6.1%) from the 3,590 counted in the 2000 census.