In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Somerton like this:
SOMERTON, a parish in Sudbury district, Suffolk; 8 miles NNW of Sudbury r. station. Post town, Bury-St. Edmunds. Acres, 1,040. Real property, £1,600. Pop., 153. Houses, 29. S. Hall is the seat of J. E. Hale, Esq. The living is a rectory in the diocese of Norwich. Value, £207.* Patron, the Marquis of Downshire. The church is good.
GB Historical GIS / University of Portsmouth, History of Somerton, in Babergh and Suffolk | Map and description, A Vision of Britain through Time.
Date accessed: 29th March 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time , and maybe some references to other places called " Somerton ".