Bayside is an unincorporated community 2.25 miles south-southeast of Arcata, at an elevation of 33 feet in Humboldt County, California. The ZIP Code is 95524, the area code is 707. The relatively large area was originally covered by large, ancient Coast Redwood trees down to what was the edge of a significantly larger Humboldt Bay at high tide. Later, the mammoth redwoods made it the natural placement of some of the area's earliest redwood lumber operations.