Alton, Illinois
Alton is a city in Madison County, Illinois, with 25,676 residents in 2020. It spans 2 congressional districts: IL-13 (92%) and IL-15 (7.6%). It spans 2 state senate and 2 state house districts.
County
| County | Share of residents |
|---|---|
| Madison County | 100% |
Congressional districts
| Congressional district | Share of residents |
|---|---|
| Illinois's 13th congressional district (IL-13) | 92% |
| Illinois's 15th congressional district (IL-15) | 7.6% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (IL-13) | Nikki Budzinski (D) | 202-225-2371 | 92% |
| U.S. Representative (IL-15) | Mary E. Miller (R) | 202-225-5271 | 7.6% |
| U.S. Senator | Richard J. Durbin (D) | 202-224-2152 · contact form | statewide |
| U.S. Senator | Tammy Duckworth (D) | 202-224-2854 · contact form | statewide |
| State Senator (State Senate District 56) | Erica Harriss (R) | 618-307-5789 | 100% |
| State Senator (State Senate District 50) | Jil Tracy (R) | 217-223-0833 | <0.1% |
| State Representative (State House District 111) | Amy Elik (R) | 618-433-8046 | 100% |
| State Representative (State House District 100) | C.D. Davidsmeyer (R) | 618-639-2071 | <0.1% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Alton website: https://www.cityofaltonil.gov/
- Alton laws: search for the Alton, Illinois code of ordinances
- Madison County website: http://www.co.madison.il.us
- Madison County laws: search for the Madison County, Illinois code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 56 | 100% |
| State Senate District 50 | <0.1% |
| State house district | Share of residents |
|---|---|
| State House District 111 | 100% |
| State House District 100 | <0.1% |
ZIP codes
Percentages mark ZIPs only partly in Alton: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Alton's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:1701114")
Alton here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.