According to an estimate Apple Watch reached 100M users in December, 30M of which came in 2020; 35% of US iPhone users wear an Apple Watch (Neil Cybart/Above Avalon)

Neil Cybart / Above Avalon:
According to an estimate Apple Watch reached 100M users in December, 30M of which came in 2020; 35% of US iPhone users wear an Apple Watch  —  More than 100 million people wear an Apple Watch.  Based on my estimates, Apple surpassed the important adoption milestone this past December.