Senator Diane Feinstein
SF Office: (415) 393-0707
DC Office: (202) 224-3841
LA Office: (310) 914-7300
San Diego Office: (619) 231-9712
Fresno Office: (559) 485-7430
Mailing Address: Sen. Dianne Feinstein, U.S. Senate, 331 Hart Senate Office Building, Washington DC 20510
If you can't get through to one office, try another. There is no benefit to calling one office over another. Calls are tracked by zip code and by position on the issue about which you are calling. Therefore, it's best not to combine multiple issues per call but to make separate calls for each issue about which you are concerned. Leaving a voicemail is as good as reaching a live person. Both are treated equally. All calls are consolidated and reported to the D.C. office daily.
In-depth personal stories, describing why these issues are important to you, are very powerful but are most effective if submitted in writing via the Senator's website here.