Colusa (formerly Colusi, Colusi’s, Koru and Salmon Bend) is a city in and the county seat of Colusa County, California. Take a look below for 20 fun and bizarre facts about Colusa, California, United States. 1. The population was 5,971 at the 2010 census, up from 5,402 at the 2000 census. 2. Colusi originates from…