The three Triangle counties of Durham, Orange, and Wake counties each have their own system of libraries.
Durham County
- Main Library
- Bragtown Branch Library
- East Regional Library
- McDougald Terrace Branch Library
- North Regional Library
- South Regional Library
- Southwest Regional Library
- Stanford L. Warren Library
Orange County
Wake County
- Athens Drive Community Library
- Cameron Village Regional Library
- Cary Community Library
- Duraleigh Road Community Library
- East Regional Library
- Express Library
- Eva Perry Regional Library
- Fuquay-Varina Community Library
- Green Road Community Library
- Holly Springs Community Library
- Leesville Community Library
- North Regional Library
- Olivia Raney Local History Library
- Richard B. Harrison Community Library
- Southeast Regional Library
- Southgate Community Library
- Wake Forest Community Library
- Wendell Community Library
- West Regional Library
- Zebulon Community Library