"LACKFORD, a hundred in the NW of Suffolk, contiguous to Norfolk and to Cambridgeshire; and containing Brandon parish, sixteen other parishes, and part of another. Acres, 77,025. Pop. in 1851, 16,321; in 1861, 15,077. Houses, 3,216."
(From John Marius Wilson, Imperial Gazetteer of England and Wales (1870-72).)
NEWMARKET RD in 1836 - 17 parishes comprising the two parishes of Newmarket :- All Saints which is in Cheveley Hundred, Cambridgeshire and St. Mary's which is in Lackford Hundred, Suffolk, plus the 6 parishes of Dalham, Gazeley, Lidgate, Moulton, Ousden and Exning which are in Suffolk together with the 21 parishes of Ashley, Burrough Green, Bottisham, Brinkley, Burwell, Cheveley, Chippenham, Dullingham, Fordham, Isleham, Kennet, Kirtling, Lanwade, Soham, Snailwell, Stretchworth, Swaffham Prior, Swaffham Bulbeck, Westley, Wicken, and Wood-Ditton all in Cambridgeshire.
THETFORD 34 parishes comprising the 3 parishes of Thetford, namely St. Peters, St. Cuthberts and St Marys, Kilverstone, Croxton, East Wretham, West Wretham, Brettenham, Rushford, Hethwold, Northwold, Santon, Hockwold-cum-Wilton, Feltwell, Mundford, Lynford, West Tofts, Sturston, Cranwich, and Weeting-cum-Broomhill all in Norfolk. Also the parishes of Santon Downham, Brandon, Barnham, Fakenham-Magna, Euston, Honnington, Sapiston, Coney Weston, Barningham, Weston Market, Hepworth, Thelnetham, Hopton and Knettishall in Blackbourn and Lackford Hundreds in Suffolk. Thetford Union is divided into 2 sub-districts :- Thetford and Methwold.
See A Vision of Britain for a description of Lackford through time.
The Workhouse site has an interesting description of Thingoe Workhouse which served Lackford.