Antwiki has quite a few on there. Batspiderfish might be able to name a few also.
It is very important to know an ant's anatomy to identify it, though. So here's a couple of charts for that:
(ignore the fact that this is a Ponerine ant.
This goes right along with subfamily identification, which is very important.
In your area, there are five different subfamilies; the most common being Formicinae, Dolichoderinae, and Myrmicinae. Telling that an ant is from Myrmicinae is relatively easy compared to Formicinae and Dolichoderinae. This is because myrmicine ants have both a petiole and post-petiole which are distinct. Myrmicine ants of RI are: Aphaenogaster, Crematogaster, Temnothorax, Myrmica, Stennama, Monomorium, Tetramorium
, and Myrmecina
In Formicinae, all ants have an acidopore used for spraying formic acid. They also have only the petiole present, which may resemble a "spike" of sorts. Formicine ants in your area include Camponotus, Formica, Lasius, Nylanderia
, and Prenolepis
Dolichoderine ants, on the other hand, resemble formicine ones but lack the acidopore. The ants you'll find in this subfamily in your area are the genera Dolichoderus
Outliers which should be much easier to identify are the Ponerine genus Ponera (of which there's only one species this far north) and Stigmatomma, belonging to Amblyoponiae.