The Valais and the regions around Bellinzona and Lugano also seem to have been well-populated; however, those lay outside the Helvetian borders.
Nekateri tradicionalni keltski opidi, na primer Vindonissa (sedanji Windish) in Basilea (sedanji Basel) so postali sedeži rimskih garnizij, drugi, na primer hribovska utrdba na Bois de Châtel, pa so bili preseljeni.