The notion that most of the unsheltered here came from elsewhere is just plain wrong.
According to the January 2019 Homeless Census, 87% of the homeless in Sonoma County lived in Sonoma County prior to be becoming homeless.
As for the statement that "many" of those here "would not mind going a few miles north...." I am compelled to ask how many of the 3,000 such individuals here have personally told you that? And what is referred to as "a few miles" north is actually more than 100 miles from northern Santa Rosa.