Hi Mike, Sunderland was created a Parliamentary Borough by the 1832 Reform Act, and a County Borough by the 1835 Municipal Corporation Act, which took it out of the control of Durham County Council. The correct term should be 'in the County Borough of Sunderland and the County of Durham.' But I suppose it was much easier to write 'in the Counties of Sunderland and Durham', especially if you were doing it many times a day. Monkwearmouth and Monkwearmouth Shore were always in the County Borough, but Southwick was not included until 1928, although it was in the Parliamentary Borough. The original borough boundary was intended to be the 1832 parliamentary constituency boundary, but it was reduced, north of the river to Monkwearmouth and Monkwearmouth Shore. South of the river to an area enclosed by a circular line with a radius of one mile from the centre of Wearmouth bridge. Regards Stan Mapstone