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How to send mail to Assemblymember Mia Bonta

To write to Assemblymember Mia Bonta, the Democratic assemblymember representing California's 18th legislative district, address your letter to The Honorable Mia Bonta, California State Assembly, 1515 Clay St. Suite 2204, Oakland, CA 94612. This is Bonta's standing constituent-mail address — reachable year-round, unlike a capitol-session address. Say who you are, keep it to one issue, and make a clear ask.

California State Assembly — district office

The Honorable Mia Bonta
California State Assembly
1515 Clay St. Suite 2204
Oakland, CA  94612

The address California's legislature publishes for Mia Bonta's constituent mail — reachable year-round, including when the legislature is out of session.

Verified September 2026senate.ca.govopenstates.org

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Your name
Your return address

The Honorable Mia BontaCalifornia State Assembly1515 Clay St. Suite 2204Oakland, CA 94612

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Key facts

  • Address mail to The Honorable Mia Bonta, California State Assembly, 1515 Clay St. Suite 2204, Oakland, CA 94612. Letters you send need normal postage.
  • Mia Bonta is the Democratic assemblymember representing California's 18th legislative district.
  • Say who you are and where you live: include your full name and home address so Bonta's office can confirm you're a constituent — that's who casework and replies are prioritized for.
  • This is Bonta's standing constituent-mail address, not the state capitol — it's reachable year-round, including when the legislature is out of session, so it's the more reliable address for mail.
  • One clear ask per letter — support or oppose a specific bill, request help with a state agency, or ask for a meeting. A short, specific letter gets a real reply; a multi-issue letter gets a form response.
  • Find Bonta's official page and other contact options at https://a18.asmdc.org.
  • PostPal prints your letter and hands it to USPS the next business day for $5 — no printer, envelope, or stamps.

How to send your letter

  1. 1

    Confirm Mia Bonta is your assemblymember

    Mia Bonta represents District 18 in the California State Assembly. If you're not sure which district you live in, look it up by address on your state legislature's website before writing.

  2. 2

    Say who you are and where you live

    Open with your full name, street address, and ZIP code. Legislative offices sort mail by whether the writer is a constituent — your address is how they confirm it.

  3. 3

    Keep it to one issue with a clear ask

    One page, one topic, one specific request — support or oppose a named bill, take a position, or ask for help with a state agency. Specific beats broad.

  4. 4

    Send it without printing anything

    Write your letter in PostPal with Mia Bonta's address prefilled and we print, envelope, and mail it via USPS the next business day for $5 — with a dated confirmation email.

Common questions

What is Assemblymember Mia Bonta's mailing address?

The Honorable Mia Bonta, California State Assembly, 1515 Clay St. Suite 2204, Oakland, CA 94612. This is Bonta's district office; letters need normal postage.

Why a district office and not the state capitol?

Most state legislatures are only in session part of the year, and capitol-office assignments can change every session. The district office is Bonta's standing, year-round address — the one California's legislature itself publishes for constituent mail.

Do I have to live in Bonta's district to write?

Anyone can write, but Bonta's office prioritizes constituents for casework and replies. If you live in the district, say so and include your address.

Will Mia Bonta actually read my letter?

Constituent mail is logged by staff and tallied on issues that come up repeatedly. Include your return address (PostPal prints yours automatically) so a reply has somewhere to go.

Sources

Addresses verified September 2026 against official sources. Always confirm on the official site before time-sensitive filings.

See the full California state legislators rules — what you can and can’t send, photos & more →

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