North East Tolkien Society
The North East Tolkien Society, formerly known as the New York Tolkien Society, and also known as Heren Istarion, is/was the largest American Smial of The Tolkien Society. The main force behind Heren Istarion are co-chairs Anthony Burdge and his wife Jessica Burke. It is semi-dormant since 2009 due to hardship encountered by the co-chairs due to the great recession.
Aside from Heren Istarion New York City has a Meetup.com group: NYC Area Friends of J.R.R. Tolkien & Fantasy, that appears to be active as it meets monthly.