Where do harbor porpoise live?

In the eastern North Pacific Ocean, the harbor porpoise ranges from Point Barrow, along the Alaskan coast, and down the West Coast of North America to southern California (Gaskin 1984). The harbor porpoise is basically an inshore species, frequenting coastal waters and the mouths of large rivers, harbors, and bays, sometimes ascending freshwater streams. Relatively high densities of harbor porpoise have been recorded along the coasts of Washington, and Northern Oregon and California; yet, distinct seasonal changes in abundance in these areas have been noted, possibly due to a shift in distribution to deeper offshore waters during winter