The five lowest ranking Lower Super Output Areas in North Hertfordshire in 2019 were 009C, 009B, both in Letchworth South East ward, 012C in Hitchin Oughton ward, 007B in Letchworth Wilbury ward and 003C in Letchworth Grange ward."Index of Multiple Deprivation, 2019". Indices of Deprivation. Department for Levelling Up, Housing and Communities. Retrieved 2 April 2022.
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Keath, Michael P K (March 1983). "Appendix 5"(PDF). The Development of School Construction Systems in Hertfordshire 1946-64 (PhD thesis). pp. 322, 324. Retrieved 24 October 2021.
North Hertfordshire (Parish) Order(PDF). Letchworth Garden City: North Hertfordshire District Council. 2004. Archived from the original(PDF) on 27 October 2021. Retrieved 13 October 2021.
North Hertfordshire (Parish) Order(PDF). Letchworth Garden City: North Hertfordshire District Council. 2004. Archived from the original(PDF) on 27 October 2021. Retrieved 13 October 2021.