I’m sure there are lists of zip codes on the net. Wanna talk to Nanzi? Look up a San Fran code.
Just as easy to get her direct dial number off her page and call her directly, without benefit of switchboard.
I go to their website and get the zip code for one of their offices. Their contact forms often require an address. If so, I change the street number just a little different from the office as well. Always gets me past their hurdles!