The Borough of Darlington is a unitary authority area with borough status in County Durham, England. Since 1997 Darlington Borough Council has been a unitary authority; it is independent from Durham County Council. It is named after its largest settlement, the town of Darlington, where the council is based. The borough also includes a rural area surrounding …The Borough of Darlington is a unitary authority area with borough status in County Durham, England. Since 1997 Darlington Borough Council has been a unitary authority; it is independent from Durham County Council. It is named after its largest settlement, the town of Darlington, where the council is based. The borough also includes a rural area surrounding the town which contains several villages. The population of the borough at the 2021 census was 107,800, of which over 86% lived in the built-up area of Darlington itself.