In February 1973, North Charleston doubled its area through annexation, and in March expanded into Berkeley County. In May 1973, the city launched its new police department, which included 21 officers and six cars. By the end of North Charleston's first year, the population had increased from 22,000 to 53,000, largely through annexation. Through continued growth and the development of 20 churches, a 62-store shopping mall and other large tracts of residential neighborhoods, the city was ranked as the third-largest city in South Carolina on July 3, 1976.