India, Jan. 17 -- The number of Amazon Prime members in the U.S. is growing slowly, but steadily, a recent study has shown.

According to the survey by the Consumer Intelligence Research Partners, LLC or CIRP, the number of Amazon Prime members in the U.S. is estimated to have risen to 112 million in December 2019 from just over 100 million in the same period of the prior year.

In contrast, the number of Amazon Prime members was just over 50 million in December 2015.

"While US Amazon Prime member growth has slowed considerably from even a few years ago, it continues steadily. It grew 11% in 2019, the same rate as 2018, with a surprisingly strong December 2019 quarter," said Josh Lowitz, Partner and Co-Founder of CIRP.

Prime members acc...