A large number of Deans lived just south of Cambridge in the 17th, 18th, and 19th centuries. These Deans lived just 4 or 5 kilometers south of Cambridge, primarily in the villages of Great and Little Shelford and their neighbour, Stapleford.
The Deans were an incredibly prolific family, averaging eight children per generation.
The earliest recorded Dean, my 8th great grandfather, was John Dean b. ~1653 in Sawston, a village about 5 km SE of Great Shelford. He married Anne Farebanke at St. Benedicts, Cambridge, on September 30, 1679. They had four children. John died 17 January, 1690 in Sawston at the relatively young age of 37.
The next generation was headed by their eldest son (and second child), John b. 1685, who on November 11, 1711 married Mary Story. They had eight children.
The next generation was headed by William Dean b. 1719 who married Constance Tunwell. They had seven children. One son, John Dean b. 1753, with Esther Turner, had twelve children. Five of their sons, William (1781-1847), John (1783-1851), Thomas, our branch (1788-1872), James (1790-1870) and Stephen (1796-1883), headed large families themselves, and their forty-two children, also prolific, have produced many, many more Deans.
One family tree that I discovered had over 200 Deans dating from John Dean b. ~1653, and this tree had only followed about half the Deans.
While some of the descendants of John Dean and Esther Turner remained in and around the Great Shelford, many were scattered throughout the new world – Canada, the US and, in particular, to Australia.
Discovering the Deans in Cambridgeshire
Much of the original research comes from my second cousin, Art Evans, who distributed handwritten, family group records he collected in Stapleford in the mid-1990s.
All of this has been confirmed and extended by research on the web.
The Deans of Cambridgeshire must be one of the most documented family trees in England, most likely because of the incredibly detailed and accessible Parish Records in this part of Cambridgeshire.
The documented record traces the Dean family back to Edward I, King of England, and ultimately to William the Conqueror.
I have discovered and connected with a dozen researchers around the world who have Deans descended from John Dean b. 1653 and Annis (Anne) Farebanke in their family trees. Some trees have over 200 Deans.
Thanks to them, I have records on over 200 Cambridgeshire Deans.
 In the 1881 census of Great Shelford, Dean was by far the most popular name – 70 Deans in the village. The next most popular name was Abbot with 26. ..\Family\DEANS\Dean Surname in Great Shelford.doc
 Kind thanks (in order of my discovery) to: John Maris, England?; Robyn Smith, Australia; Sue Brown , New South Wales, Australia; David Taylor, England?; Stephen Alley; Paul and Leslie Gates, Derby UK http://porpoisehead.net/gedview/; Eden Maher, Newcastle, Australia; Liane Francis, Gold Coast, Queensland, Australia; Maureen Allen, Rodborough, UK; Roz (Elbourn) Bainbridge, Sydney, Australia; Wallace James Kirkpatrick, NSW, Australia http://www.genealogy.kirkpatrickaustralian.com/TNG/getperson.php?personID=I10169&tree=TKG; Kevin S. Thompson, Brisbane, Queensland, Australia http://www.tribalpages.com/tribe/browse?userid=kevthompsonfamily&view=9&ver=7; Margaret Richardson, Hertfordshire, UK, http://knebworth.tribalpages.com/tribe/browse?userid=knebworth&view=9&ver=155; Beverley (Matthews) Callaghan, Gold Coast, Queensland, Australia; Joan Hall-Hudson, Laurentians, Quebec; and Valerie Breen, Seattle, Washington.