Canada (NB), China (mainland) (NB), Eastern Central Pacific (B) (NB), Guam (NB), Japan (B), Marshall Islands (NB), Mexico (NB), Micronesia [Federated States of] (NB), Northeast Pacific (NB), Northwest Pacific (B) (NB), Russia (Asian) (NB), South Korea (NB), Taiwan (China) (NB), United States Minor Outlying Islands (B), USA, Western Central Pacific (NB).
Vagrant to New Zealand.
Unknown to Northern Mariana Islands, Palau.
Western Hawaii; small numbers in Izu, Bonin and southern Ryukyu Is, to south of Japan.
 
Population
Estimated population is 120,000 (2010) and decreasing.