My grandparents -- Pietro and Giovanna [Nave] Toso -- were from the town of Varese Ligure in the Liguria Region of northern Italy. They each came to the U.S. in the late 1890s. Pietro settled in Colma, San Mateo County, California, where he married Giovanna. They had a number of acres of land in Colma and ran a vegetable-growing farm for many years.
I know that they had relatives who remained in Italy, although I haven't been able to locate and contact their descendants to date.
If you are researching this family, I'd be delighted to hear from you. I'd also be glad to trade information.