Amazon Prime subscriptions ramp up in the US DetailsMichelle Clancy | 09 July 2017 Amazon Prime membership has reached 85 million members in the United States, according to number-crunching from*Consumer Intelligence Research Partners*(CIRP).That number translates into about 63% of all domestic customers on the site deciding to subscribe to Prime. Amazon offers Prime Video*and free two-day shipping for $99 per year; there