POPULATION: INFO: Ericson County is located the western coast of Douglas Island and is south of Evergreen County. To the north is Jackson County. Port Shallow is the county seat. The largest city in Ericson County is Port Shallow, which is also the largest city on Douglas Island. Port Shallow is the center of commerce in the county and transportation hub. Bravewood and Granmont are two suburb communities in Ericson County. The climate is often mild winters, with warm to hot summers.