The Farmington Valley is located west of Hartford, Connecticut in Hartford and Litchfield Counties. It is defined by the Farmington River, which runs through it.
The term Farmington Valley, as used in the local vernacular, refers primarily to the towns of Farmington, Avon, Simsbury, Canton and Granby. However, when defined by the course of the Farmington River, or by its entire watershed, the term can refer to large areas of land across the north central portion of Connecticut and into southern Massachusetts.