Through a good friend, in 1980 I met another friend who lived in Napa, CA. At that point in time, he said it had only been about a year since Napa exchanges no longer required dialing Operator for long distance. In the more populated parts of the SF Bay Area, direct dial long distance was widely available by the mid '60s.
In Crockett, CA, not too far east of the SF Bay Area, they didn't have dial phones until the mid to late '70s. That exchange may have been the last in the state to transition to dial service.
While I was working at Pacific Bell, the old timers would often say that Pacific Telephone had always been Ma Bell's ugly stepchild. We got everything last. Even the heavily recycled 302 type telephone sets, introduced in 1937, were still being deployed for residential service into the early '60s, a good dozen years after the modern 500 models had been introduced east of the Rockies. There was one mechanical switch still remaining here in this city that was closing in on population 1,000,000 back in the early '90s. Subscribers in that exchange couldn't even get Call Waiting over a dozen years after most others in the area had been using it and other features, which became available with upgrades to electronic switching equipment. Ma Bell's legacy was a tough one to shake for Pac Bell until the Telecommunications Act of 1996 changed the telecom game forever, and not necessarily for the better.