Acampo is a small census-designated place just north of Lodi in San Joaquin County, California, United States. In the 1870s, Acampo was named as a Southern Pacific Railroad station. Acampo's populat…Acampo is a small census-designated place just north of Lodi in San Joaquin County, California, United States. In the 1870s, Acampo was named as a Southern Pacific Railroad station. Acampo's population was 341 at the 2010 census.