Weed is a city 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, including 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. Weed is about 10 miles (16 km) west-northwest of Mount Shasta, a prominent northern California landmark, and the second-tallest volcano in the Cascade Range.