R.I. GEN. LAWS §45-40.1-3. “Public agency” defined
(a) For the purposes of this chapter, the term “public agency” means any political subdivision of this state, any agency of the state government or of the United States, and any political subdivision of another state.
(b) The term “state” means a state of the United States.
R.I. GEN. LAWS §45-40.1-4 Interlocal agreements. (a) Any power or powers, privileges, or authority, exercised or capable of exercise by a public agency of this state, may be exercised and enjoyed jointly with any other public agency of any other state or of the United States, and to the extent that laws of the other state or of the United States permit the joint exercise or enjoyment. Any agency of the state government, when acting jointly with any public agency may exercise and enjoy all of the powers, privileges, and authority conferred by this chapter upon a public agency.
Link to the full statute can be found here: www.rilin.state.ri.us/Statutes/TITLE45/45-40.1/INDEX.HTM