The Cattaraugus County Legislative District 3 represents the following municipalities:
- Town of Ellicottville (2010 Census Pop. 1,576)
- Town of Farmersville (2010 Census Pop. 1,090)
- Town of Franklinville (2010 Census Pop. 2,990)
- Town of Lyndon (2010 Census Pop. 707)
- Town of Machias (2010 Census Pop. 2,375)
- Town of Mansfield (2010 Census Pop. 808)