This is Blackbourn Hundred in Suffolk.

The Blackbourn hundred, in the North Western part of Suffolk, is about 15 miles in length from east to west, and from 7 to 10 miles in breadth. It is bounded on the north, by the Little Ouse River, which separates it from Norfolk. It is intersected by the River Thet and several smaller streams. The navigable river Lark forms a part of its western boundary, and the Little Ouse is navigable to Thetford.

Here is a start to Blackbourn. Quoting from the Whites 1844 Directory. And links are to the 1841 census.

These can all be searched (eventually) by surname (only) through the Essex & Suffolk Search engine - see the bottom of this page. This needs updating.

What does this table mean? It is the acreage of each parish and the population for each in 1801 and 1841.

Plus: From the Cosford Hundred:::

Kettlebaston 1841 Census

Hitcham 1841

The best site  in Suffolk is :The Cosford Database

Here is a map of the area.

And already transcribed (by others) are :

 lots more from Freston Suffolk and also  Chelmondiston census indexes

Samford (Part) 1891 Census Index - wow.

Of course, we must not forget that you can visit the *Census | Record Office | Heritage

and not forgetting some gravestones at the Suffolk Gravestone Photographic Resource Project

And  Wickham Skeith, and all the Suffolk Workhouses ; and  1851 Carlton . Plus,

Haverhill-UK - 1891 Census - and Preston St Mary and  Parish Register For Woolpit, Suffolk

Not in Samford, but a partial index for Mendlesham is here. Plus  - 1841 Census  - Woodrising, Norfolk

Raydon  -  Coles - Help         - Any feedback welcome.

Also a database search  for Suffolk is here Suffolk 1841 census data Search engine too! Not too many names yet. This needs updating with all new census.