Very few Electoral Registers are available online.
They are usually available in local libraries, or record offices.
Gateshead Libraries says:
We hold most registers for Gateshead from 1832 to date. Please note:
There were no registers compiled between 1914 and 1920
Prior to 1974 we only hold registers for the historic Gateshead borough which was much smaller than today.*
Women over 30 were granted the vote in 1918 and almost everyone over the age of 21 could take part in an election by 1928.
*In 1974 the present Metropolitan Borough of Gateshead was created by amalgamating Gateshead County Borough, the Urban Districts of Felling, Whickham, Blaydon and Ryton and half of Chester-le-Street Rural District (the Birtley and Lamesley portion). Records for these areas are held by Durham Libraries/Durham Records Office.
