That depends on your carrier, and how they deliver caller ID. I use a VOIP service through Charter Communications, and most of the calls display as "1 (xxx) xxx-xxxx", even within my area code, which is 805.
Called 9/16/15 at 1:42 pm PDT. Caller ID showed "California" so knew it was a telemarketer. My phone answered by Sentry robo call blocker. Call did not ring through. Interesting if it is an a/c cleaning service as we do not have central air conditioning nor ever have had it in the 40+ years we've lived in this house.