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Illinois 12th congressional district

IL-12 · 119th Congress (2020 Census) · 746,831 residents · Federal money here

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These lines have been in force since the 118th Congress.

Where IL-12 sits in Illinois

IL-12 is outlined among the 16 other seats in Illinois. Hover any district for its representative and its median household income; click to open it. Colour shows the party of the sitting member, not the value, and the outline is a deliberately non-party colour so a highlighted seat cannot be misread as one. Boundaries are the 119th Congress plan.

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Current representative

Mike Bost

Republican · holding this seat since 2015

Recorded votes

Yea 4,112Nay 2,055

of 6,386 roll calls across their career.

See how they voted →

Government experience

  • House · IL-122025–2027
  • House · IL-122023–2025
  • House · IL-122021–2023
  • House · IL-122019–2021
  • House · IL-122017–2019
  • House · IL-122015–2017

Where their votes land

Democratic side94 · Voted with Republicans almost every timeRepublican side
  • Average House Democrat: 2
  • Average House Republican: 98

Overall, averaged across 7 values of hand-picked votes that split the parties.

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See how they align on key issues →

Where the money came from

Receipts into Mike Bost’s own campaign committee over the 2025–2026 election cycle, through June 30, 2026.

  • Small individual donors$39,507
  • Large individual donors$473,092
  • PACs$810,987
  • Party committees$250
  • Other and unclassified$3,389
  • Total receipts$1,327,225
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See who gave: PACs, individual giving and transfers →
What these categories mean
Small individual donors
People whose giving stayed under $200 in total. The FEC does not require them to be named, so who they are is genuinely unknown — not merely unlisted.
Large individual donors
People whose giving passed $200, which is the point at which the campaign must report their name, employer and occupation.
PACs
Political action committees — corporate, trade, union and ideological. Money from an organisation rather than from a person.
Party committees
The member's own national, state or congressional-campaign party committees.
Other and unclassified
The remainder once every category above is accounted for: federal funds, offsets, interest, and anything this site could not classify. It is a residual, not a kind of donor.

This is money the campaign itself received. It is not everything spent to win the seat. It excludes leadership PACs, and it excludes independent expenditures and other outside spending — money spent to elect or defeat a candidate by groups they may not lawfully coordinate with, which in a contested race can exceed everything shown above. It is not personal income or net worth, which are a separate filing altogether. Figures are as filed with the Federal Election Commission and are only as current as the last report, covering through June 30, 2026; a cycle still running is a partial count. Check this filing on fec.gov.

Personal finances

Separately from the campaign money above, Mike Bost files a report about their own money: what they own, what they owe, what they earn outside Congress, and every stock trade they make. The law requires it, and every figure in it is a range rather than an amount — which is why the columns below are ranges too.

What they report owning, and owing
  • Reported assets$298k to $826k26 lines, 1 with no figure
  • Reported debts$100k to $250k1 line

Every column is read from $0. The solid height is the total of the low ends of the bands the filer ticked; the pale cap runs on to the total of the high ends, and is the range the form allows — not a margin of error and not a guess. Assets less debts comes to $48k to $726k — a range, and not a net worth: the form does not ask about a personal residence that earns nothing, about congressional salary, or about the exact value of anything.

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What the holdings are
  • Funds and managed accounts5 holdings$110k to $300k
  • Bonds, cash and other securities3 holdings$101k to $215k
  • Private businesses and partnerships3 holdings$65k to $151k
  • Everything else1 holding$15k to $50k
  • Stocks and stock options11 holdings$6k to $94k
  • Retirement, pensions and insurance3 holdings, 1 with no figure$1k to $16k
  • Every group$298k to $826k

A slice needs one number and a filer ticks a range, so each arc is its group’s floor — the total of the low ends they ticked — and the figure in the hole is the total of those floors. The band printed beside each group is the real answer, and it is wider than the arc. 1 holding carry no figure at all and are in no arc.

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From Mike Bost’s own financial disclosure, filed under the Ethics in Government Act. Every figure is the band the filer ticked.

See what they own, owe, earn and trade →

Latest figures — Measured on this ground since they took the seat

Contact my Representative about thisMike Bost (opens their office’s page in a new tab)

Click one of the figures to see how it has changed over time.

Each arrow is the latest published figure against the newest one published before Mike Bost took this seat, with the two periods named beside it. A rate moves in percentage points; every other indicator is shown as a share of where it started, and a dollar figure also by how much it moved after inflation, with both figures restated in the same year’s dollars. A row marked redrawn is one whose district lines moved between the two figures: they describe different ground, so that change belongs to the seat number rather than to a fixed piece of land. A row marked earliest had nothing published before they took the seat, so it is measured from the first figure there is — a window that starts inside their tenure rather than at the beginning of it. These are conditions in the district, not a record of the member. Nothing here is evidence that they caused any of it, or that a different representative would have produced different numbers.

Median household income over time, 2005-2009 to 2020-2024

See every state ranked by this indicatorSee every district ranked by this indicator
Contact my Representative about thisMike Bost (opens their office’s page in a new tab)

Half of households in the district earn more than this, half less.

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Median household income by period, with 90% margins of error, the same figures in 2025 dollars.
PeriodMedian incomeIn 2025 dollarsMargin of errorCongress
2005-2009$41,975$62,989± $435111th
2006-2010$43,348$64,000± $635111th
2007-2011$44,353$63,480± $688112th
Lines redrawn for the 113th Congress — figures above and below describe different areas.2008-2012$44,490$62,385± $567113th
2009-2013$44,641$61,693± $526113th
2010-2014$44,869$61,018± $567114th
2011-2015$45,018$61,148± $563114th
2012-2016$45,874$61,535± $595115th
2013-2017$47,214$62,011± $625115th
2014-2018$49,322$63,235± $813116th
2015-2019$50,948$64,158± $720116th
2016-2020$53,061$66,004± $884116th
2017-2021$56,256$66,838± $793116th
Lines redrawn for the 118th Congress — figures above and below describe different areas.2018-2022$64,278$70,711± $835118th
2019-2023$66,758$70,535± $919118th
2020-2024$68,540$70,343± $976119th

The "in 2025 dollars" figures are the published ones restated for inflation with the BLS Consumer Price Index for All Urban Consumers (CPI-U), U.S. city average, all items, annual average. A five-year estimate is published in the dollars of its final year, so 2016-2020 is adjusted from 2020 dollars. The adjustment is the same for every place in a period, so it changes no ranking; it says what a figure from an earlier period would be in today's money. It is not a local cost of living, and the margin of error is still the published one.

Nominal dollars as published for each period -- not inflation-adjusted. A median cannot be averaged across areas, so this is published district-level data only.

This is a median. It is published as measured and is never re-aggregated from smaller areas — averaging medians does not produce a median.

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Who represented this district

Every member who held IL-12, grouped by the stretches over which these lines stayed the same. The groups break where the chart above breaks, because the members either side of a redraw represented different ground.

Every member who held IL-12, grouped by the stretches over which the district lines stayed the same.
MemberPartyYearsLines in force
Jerry F. Costello · 2 termsDemocrat2009–2013111th–112th Congresses
Lines redrawn for the 113th Congress — figures above and below describe different areas.William L. EnyartDemocrat2013–2015113th–116th Congresses
Mike Bost · 4 termsRepublican2015–2023
Lines redrawn for the 118th Congress — figures above and below describe different areas.Mike Bost · 2 termsRepublican2023–present118th–119th Congresses

Party is the party held during that term, not the member’s party today. A stretch ends where the district was redrawn: the members either side of a break represented different ground, so the seat number is the only thing they have in common. Nothing here says a member caused any figure on this page to move. Source: unitedstates/congress-legislators.