Weed is a city located in Siskiyou County, California, United States. As of the 2010 Census, the town had a total population of 2,967, down from 2,979 in 2000. There are several unincorporated communities adjacent to, or just outside Weed proper. These include Edgewood, Carrick, and Lake Shastina. These communities generally have mailing addresses that use Weed, or its ZIP code. The total population of this area in 2007 was 6,318.