Illinois / IL-09
Illinois District 9
Score
Irregularity score 96 Very irregularLess compact than 98% of other congressional districts.
10th least compact of 429 nationally, 5th of 17 in Illinois.
A score describes shape, not intent. Coastlines, rivers and the Voting Rights Act can all make a district irregular. How scores work
The three measures
- Polsby-Popper
- 0.11at least as compact as 10% of districts on this measure
Area compared with perimeter. Low for jagged or snaking edges.
- Reock
- 0.14among the least compact 1% of districts on this measure
Area compared with the smallest circle around the district, counting only land. Low for stretched shapes.
- Convex hull
- 0.43at least as compact as 1% of districts on this measure
Area compared with a rubber band stretched around the district, counting only land. Low for bites and tentacles.
Each measure runs from 0 to 1, where 1 is a perfect circle or a shape with no dents.
The state's edge
7% of this district's border is the state's edge: a coastline, a national border or a state line. Mapmakers don't choose those lines. A ragged one, like a coastline or a river, lowers Polsby-Popper. Reock and convex hull count only the state's own land, so water and neighboring states don't count against them. More on the state's edge
Cities and towns
The largest places with people in this district, from the 2020 Census. A place split between districts shows how many of its residents live in this one.
- Chicago city254,789 of its 2,746,388 residents
- Evanston cityall 78,110 residents
- Skokie village67,785 of its 67,824 residents
- Glenview village47,542 of its 48,705 residents
- Niles village27,072 of its 30,912 residents
- Morton Grove villageall 25,297 residents
- Crystal Lake city23,096 of its 40,269 residents
- Buffalo Grove village21,929 of its 43,212 residents
- Wilmette village18,606 of its 28,170 residents
- Cary villageall 17,826 residents
And 28 smaller places. 3% of this district's people live outside any city, town or named community. How places are counted
ZIP codes
40 ZIP codes have residents in this district. 27 of them are split with other districts. A percentage is the share of that ZIP code's 2020 residents who live here.
- 60004 (26%)
- 60010 (20%)
- 60013 (92%)
- 60014 (54%)
- 60016 (1%)
- 60021 (91%)
- 60025 (86%)
- 60026
- 60029
- 60042 (32%)
- 60047 (38%)
- 60053
- 60056 (23%)
- 60060 (5%)
- 60062 (15%)
- 60068 (33%)
- 60070 (98%)
- 60076
- 60077
- 60084 (22%)
- 60089 (51%)
- 60090 (20%)
- 60091 (66%)
- 60093 (25%)
- 60102 (61%)
- 60156 (45%)
- 60201
- 60202
- 60203
- 60208
- 60613 (39%)
- 60625 (4%)
- 60626
- 60631 (24%)
- 60640 (87%)
- 60645
- 60659 (61%)
- 60660
- 60712
- 60714 (88%)
These are the Census Bureau's ZIP code areas, which match residential ZIP codes closely. ZIP codes used only for PO boxes or a single organization aren't included. How ZIP codes are matched
2024 presidential vote
Shares of the votes for the two of them; other candidates are left out. Illinois used the same lines in 2024, so this is added up from precinct results. A precinct split between districts is divided by its House votes, so the figures are close estimates. Where the votes come from
U.S. House
Statewide results from Illinois for the November 3, 2026 election aren't available yet.
Illinois's senators
- Tammy Duckworth, Democrat
- Richard J. Durbin, DemocratSeat on the November 3, 2026 ballot: results aren't available yet.
Senators are elected by the whole state, so district lines don't change who they are. Senators serving as of November 6, 2026. Senators elected in November 2026 take office January 3, 2027. Where this comes from
Where it sits in Illinois
- Very compact (0 to 19)
- Compact (20 to 39)
- Middle (40 to 59)
- Irregular (60 to 79)
- Very irregular (80 to 100)
The area outlined with dashes on the map, enlarged so its smaller districts can be seen.
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