Available online at Ancestry, findmypast or The Genealogist and other collaborating web sites - index and enumerator book images.
Enumerator book images available on CD (for Hertfordshire Unions) from British Data Archive
Parts of Herts included in 1861 Middlesex census
Copies of the Middlesex census enumerator books are now available on CD, and include a number of places in Hertfordshire close to the county boundary. See List of references.
Page updated January 2011