Laguna (more formally known as Laguna Creek) is a census-designated place (CDP) in the city of Elk Grove, Sacramento County, California, United States. It is part of the Sacramento?Arden-Arcade?Roseville Metropolitan Statistical Area. The population was 34,309, at the 2000 census, however, much of the territory was annexed by the city of Elk Grove when Elk Grove incorporated on July 1, 2000. Today it serves as a city neighborhood or district, and home to both the city Police Department and City Hall.