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How to send mail to Representative Mary Gill

To write to Representative Mary Gill, the Democratic representative representing Illinois's 35th legislative district, address your letter to The Honorable Mary Gill, Illinois House of Representatives, 10400 S. Western Ave., Chicago, IL 60643. This is Gill'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.

Illinois House of Representatives — district office

The Honorable Mary Gill
Illinois House of Representatives
10400 S. Western Ave.
Chicago, IL  60643

The address Illinois's legislature publishes for Mary Gill's constituent mail — reachable year-round, including when the legislature is out of session.

Verified September 2026ilga.govopenstates.org

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Your return address

The Honorable Mary GillIllinois House of Representatives10400 S. Western Ave.Chicago, IL 60643

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Key facts

  • Address mail to The Honorable Mary Gill, Illinois House of Representatives, 10400 S. Western Ave., Chicago, IL 60643. Letters you send need normal postage.
  • Mary Gill is the Democratic representative representing Illinois's 35th legislative district.
  • Say who you are and where you live: include your full name and home address so Gill's office can confirm you're a constituent — that's who casework and replies are prioritized for.
  • This is Gill'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 Gill's official page and other contact options at https://ilga.gov/house/Rep.asp?GA=103&MemberID=3251.
  • 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 Mary Gill is your representative

    Mary Gill represents District 35 in the Illinois House of Representatives. 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 Mary Gill'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 Representative Mary Gill's mailing address?

The Honorable Mary Gill, Illinois House of Representatives, 10400 S. Western Ave., Chicago, IL 60643. This is Gill'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 Gill's standing, year-round address — the one Illinois's legislature itself publishes for constituent mail.

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

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

Will Mary Gill 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 Illinois state legislators rules — what you can and can’t send, photos & more →

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