"Alameda and San Francisco counties also are seeing slower population growth. Existing residents left the region at their highest levels in seven years in 2017.

"Alameda and San Francisco counties also are seeing slower population growth. Existing residents left the region at their highest levels in seven years in 2017. International in-migration is compensating for the departures." [1] http://www.siliconvalleyoneworld.com/2018/03/25/new-census-data-silicon-valley-population-growth-slows/ http://www.siliconvalleyoneworld.com/2018/03/25/new-census-d...