Diane Dillon, District 3


Board of SupervisorsBoard of Supervisors

Napa Mustard

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About Diane Dillon

Diane Dillon                                        

District 3
Term Expiring
December 2018

Tel:  (707) 944-8280
Fax: (707) 253-4176


Contact Diane Dillon's aide

Diane Dillon Dec 2010



Diane was born and raised in Napa, and has lived in St. Helena for almost 30 years.  She has been an active community member her entire life; she cares about helping people, and is passionate about protecting the scenic resources and agricultural industry of Napa County.

A Napa High School graduate, Diane earned a B.A. degree with honors from UC Santa Barbara; a masters degree in library and information science from UCLA, with a specialization in law librarianship; and a J.D. from UC Davis, where she was a member of law review.

Diane actively practiced law in Napa County from 1981 to 2002. As a partner in the county’s oldest local law firm for 18 years, she gained an understanding of the challenges faced by all small business owners. She was a certified specialist in estate planning, probate, and trust administration, which allowed her the privilege of helping individuals plan for their families and business succession.  Part of her legal career also included being deputy city attorney for the City of Calistoga, which increased her understanding of the governing challenges of our small towns. 

She is the fifth generation of her family to live in Napa County, being descended from Connelly Conn, who came here in 1852 to join his uncle John Conn, who had arrived in the mid-1840s and helped Dr. Edward Bale build his grist mill. Conn Valley and Conn Dam are named for these ancestors of Diane’s. She grew up hearing about her grandmother’s trips to St. Helena by horse and buggy over the Pope Street bridge, and over Mt. St. Helena to visit relatives in Lake County and at the quicksilver mines. So it is not surprising that she also actively supports local history and preservation organizations, as well as the local genealogy society.

For more detailed information, please click on this link: Community Service – Experience – Education.


Committees & Commissions for 2017 

  • Association of Bay Area Governments (ABAG), Regional Planning Committee, Member
  • Bay Area Council Economic Institute, Member
  • Emergency Medical Care Committee (EMCC), Member
  • Great Wine Capitals (GWC), Representative
  • Napa Valley Transportation Agency (NVTA), Alternate
  • California State Association of Counties (CSAC), Board of Directors, Member; Agricultural and Natural Resources Policy Committee, Member
  • Rural County Representatives of California (RCRC), Member; Golden State Finance Authority (GSFA), Member 
  • Napa County Legislative Subcommittee, Member
  • Northern California Counties Tribal Matters Consortium, Member
  • National Association of Local Counties (NACo), Member
  • Upper Valley Waste Management Agency, Member
  • Local Agency Formation Commission (LAFCO), Member
  • Watershed Information Center and Conservancy of Napa County (WICC), Member
  • Napa County Local Food Advisory Council
  • Napa Valley Tourism Corporation (NVTC), Board of Directors
  • Napa County Fair Joint Powers Agreement Governance Ad Hoc Committee, Member
  • Yountville, Domaine Chandon, Ad Hoc Two By Two Committee, Member