Boundary Atlas

Illinois's 15th congressional district (IL-15)

Illinois's 15th congressional district (IL-15) covers parts or all of 35 counties, including Adams County, Bond County, Brown County, Calhoun County, Cass County and Christian County, and 377 ZIP codes (250 wholly inside it). Its 2020 population was 753,677. This is the map in force for the November 3, 2026 election.

753,677residents (2020 Census)
35counties
377ZIP codes
910voting precincts

Who represents IL-15

OfficeMemberContact
U.S. Representative (IL-15)Mary E. Miller (R)202-225-5271
U.S. SenatorRichard J. Durbin (D)202-224-2152 · contact form
U.S. SenatorTammy Duckworth (D)202-224-2854 · contact form

Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).

Counties

CountyShare of the county's residents in IL-15
Adams County100%
Bond County100%
Brown County100%
Calhoun County100%
Cass County100%
Christian County100%
De Witt County100%
Douglas County100%
Edgar County100%
Fayette County100%
Greene County100%
Hancock County100%
Henderson County100%
Jersey County100%
Logan County100%
Mason County100%
Menard County100%
Montgomery County100%
Morgan County100%
Moultrie County100%
Pike County100%
Schuyler County100%
Scott County100%
Shelby County100%
Coles County76%
Mercer County52%
Macon County49%
McDonough County47%
Piatt County38%
Madison County32%
Warren County30%
Sangamon County24%
Fulton County22%
Champaign County19%
Vermilion County12%

ZIP codes

Percentages mark ZIPs only partly in IL-15: the share of that ZIP's residents inside it.

Towns

Abington township, Aetna township, Alexander precinct, Alhambra township, Allens Grove township, Alsey precinct, Appanoose township, Arcadia precinct, Arcola township, Arenzville township, Ash Grove township, Ashland township, Assumption township, Astoria township, Athens North No. 2 precinct, Athens South No. 1 precinct, Athensville township, Atlanta township, Atlas township, Atterberry No. 10 precinct, Audubon township, Augusta township, Austin township, Avena township, Ayers township, Bainbridge township, Bald Bluff township, Barnett township, Barry township, Bath township, Bear Creek township, Bear Creek township, Bear Grove township, Beardstown township, Belleview precinct, Bernadotte township, Berwick township, Bethel township, Beverly township and Big Spring township and others.

Get this in your AI agent

Your agent can draw every precinct in IL-15, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

get_boundaries(id="us:congressional_district:1715", children_level="precinct", include_districts=True)