Located within Tompkins County are the City of Ithaca; the Towns of Ithaca, Caroline, Danby, Dryden, Enfield, Groton, Lansing, Newfield, and Ulysses; and the Villages of Cayuga Heights, Dryden, Freeville, Groton, Lansing, and Trumansburg.
- City of Ithaca
- Town of Ithaca
- Village of Cayuga Heights
- Town of Caroline
- Town of Danby
- Town of Dryden
- Village of Dryden
- Village of Freeville
- Town of Enfield
- Town of Groton
- Village of Groton
- Town of Lansing
- Village of Lansing
- Town of Newfield
- Town of Ulysses
- Village of Trumansburg
Tompkins County Council of Governments (TCCOG) is an association of local governments organized to provide a forum for discussion and negotiation leading to agreements for more efficient and fiscally responsible delivery of government services. One of the initiatives of TCCOG is the Greater Tompkins County Municipal Health Insurance Consortium