In the 20th century, technological advances and population growth in the region led to many changes in the way of life for people in Addington. At the beginning of the century, Addington was in the county of Surrey, which had established urban and rural districts to provide services matched to the needs of the differing communities. The parish of Addington was transferred to Godstone Rural District on abolition of Croydon Rural District in 1915. Subsequently, Addington parish was absorbed by the County Borough of Croydon in 1925. Since 1965 the county borough has been part of the London Borough of Croydon within highly urbanized Greater London, which ended over 900 years of administration by the county of Surrey.