County Longford is a county in Ireland. It is in the province of Leinster. It is named after the town of Longford. Longford County Council is the local authority for the county. The population of the county was 46,634 at the 2022 census. The county is based on the historic Gaelic territory of Annaly (Anghaile), formerly known as Teffia (Teathbha).