Blackbourn was a hundred of Suffolk, consisting of .
Blackbourn hundred was situated in the north-west of Suffolk. Its northern boundary is the Little Ouse forming the border with Norfolk, and the River Lark forms part of its western boundary.
The hundred appears in the Domesday Book as Blachruna and Blackebrune meaning "black bourn", where a bourn is a stream. The stream in question is that which flows north through Ixworth, Bardwell, and Fakenham Magna to the Little Ouse at Euston and is still known as the Black Bourn.
Parishes
Blackbourn Hundred consisted of the following 34 parishes:1841 Census Parish Area (acres)Badwell Ash1860Bardwell3142Barnham5184Barningham1555Coney Weston1321Culford2490Elmswell2021Euston3780Fakenham Magna2155Great Ashfield2030Hepworth1640Hinderclay1400Honington1204Hopton1322Hunston1120Ingham1809Ixworth2213Ixworth Thorpe1000Knettishall1025Langham1270Little Livermere1433Market Weston1090Norton2450Rickinghall1966Rushford (part)1000Sapiston1155Stanton, Suffolk3254Stowlangtoft1358Thelnetham1721Troston1770Walsham-le-Willows2760Wattisfield1600West Stow3050Wordwell2120
References