All municipalities are classed as a "city", regardless of population size. For an area to be incorporated as a city, special legislation has to be passed by the General Assembly (state legislature); typically the legislation requires a referendum amongst local voters to approve incorporation, to be passed by a simple majority. This most recently happened in 2005 and 2006 in several communities near Atlanta. Sandy Springs, a city of 85,000 bordering the north side of Atlanta, incorporated in December 2005. One year later, Johns Creek (62,000) and Milton (20,000) incorporated, which meant that the entirety of north Fulton County was now municipalized. The General Assembly also approved a plan that would potentially establish two new cities in the remaining unincorporated portions of Fulton County south of Atlanta: South Fulton and Chattahoochee Hills. Chattahoochee Hills voted to incorporate in December 2007; South Fulton voted against incorporation, and is the only remaining unincorporated portion of Fulton County.