Lincoln is a city in Placer County, California, United States. The population was estimated to be 42,126 in 2007. On July 17, 2007, Forbes. com listed Lincoln as the nation's fastest growing city from 2000 to 2006 with an increase of 238.6% in population. This growth is due to Lincoln being located in the rapid suburban development north of Sacramento, in Placer County. Lincoln is part of the Sacramento-Roseville Metropolitan Statistical Area.