Participation measured against the same-year citizen voting-age population. Audited cycles count total general-election participants — ballots or participating voters, not presidential candidate votes. Cycles before 2016 predate that series and are derived from the certified presidential returns instead; they are marked everywhere they appear and are excluded from the figures below.
2004–20248 cycles · 5 audited
2024 turnout
75.5%19,551 participants ÷ 25,900 CVAP
2020→2022 drop-off
+28.6 ptsPresidential-dependent
Drop-off vs state
+6.5 ptsPositive means a larger decline than the statewide pattern
Mechanical 2026
46.9%–56.7%Recent-cycle and two-cycle persistence scenarios; not a forecast
Participation by cycle
Presidential Midterm Derived, pre-2016
0%20%40%60%80%100%
62.5%
54.1%
20042008201220162018202020222024
Select a presidential cycle to show it on the map and results ledger above.
Cycle
Participants
CVAP
Turnout
Series
Quality
19,551
25,900 ± 1,284
75.5%
Audited
E/A
2022Mid
14,498
26,802 ± 1,155
54.1%
Audited
E/A
21,697
26,231 ± 1,257
82.7%
Audited
E/A
2018Mid
16,789
26,841 ± 830
62.5%
Audited
E/A
19,866
27,759 ± 846
71.6%
Audited
E/A
19,187
28,350
67.7%
Derived
—
20,077
28,394
70.7%
Derived
—
18,421
28,438 extrapolated
64.8%
Derived
—
Sources and methods
Audited cycles (2016, 2018, 2020, 2022, 2024) count total general-election participants against the same-year CVAP special tabulation, each cell carrying its own numerator and denominator quality grade. Derived cycles (2004, 2008, 2012) come from the certified presidential returns on this page over the ACS 5-year CVAP series, so they measure presidential votes cast rather than ballots — a floor on participation. Where a derived cycle predates the ACS its denominator is extrapolated rather than read, and says so on its own line below. They are shown for the longer arc and are excluded from the drop-off, excess-drop-off, and 2026 scenario figures above.
2024: numerator source 160, denominator source 157; estimated total ballots; preferred-county:block-reference-presidential-or-cvap-weight:v2; allocation share 100.0%; series 323/229.
2022: numerator source 160, denominator source 157; estimated total ballots; preferred-county:block-reference-presidential-or-cvap-weight:v2; allocation share 100.0%; series 322/184.
2020: numerator source 160, denominator source 157; estimated total ballots; preferred-county:block-reference-presidential-or-cvap-weight:v2; allocation share 100.0%; series 321/4.
2018: numerator source 160, denominator source 157; estimated total ballots; preferred-county:block-reference-presidential-or-cvap-weight:v2; allocation share 100.0%; series 320/139.
2016: numerator source 160, denominator source 157; estimated total ballots; preferred-county:block-reference-presidential-or-cvap-weight:v2; allocation share 100.0%; series 319/133.
2012 (derived): Certified presidential returns · ACS 5-year CVAP (B05003); presidential votes cast — a floor on participation, not a ballot count.
2008 (derived): Certified presidential returns · ACS 5-year CVAP (B05003); presidential votes cast — a floor on participation, not a ballot count.
2004 (derived): Certified presidential returns · extrapolated CVAP denominator; presidential votes cast — a floor on participation, not a ballot count; 2004 predates the ACS, so the denominator is a linear back-extrapolation from the 2008 and 2012 CVAP values, not a read figure.
presidential history
Party record book
Buffalo Grove, IL · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
2004–2024 · 6 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Barack Obama2008
67.1%
13,471 votes · D+35.3
Runner-up · Joe Biden, 2020 · 66.0%
Republican
George W. Bush2004
41.4%
7,623 votes · D+16.8
Runner-up · Mitt Romney, 2012 · 38.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
14,170votes
66.0% of the vote · D+33.5
Runner-up · Barack Obama, 2008 · 13,471 votes
Republican
George W. Bush2004
7,623votes
41.4% of the vote · D+16.8
Runner-up · Mitt Romney, 2012 · 7,329 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
Hillary Clinton2016
+31.6pts D vs U.S.
Place D+33.7 · U.S. D+2.1
Runner-up · Kamala Harris, 2024 · +30.6 pts
Republican
Mitt Romney2012
−18.3pts R vs U.S.
Place D+22.2 · U.S. D+3.9
Runner-up · George W. Bush, 2004 · −19.3 pts
U.S. House elections · 2 House
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row shows U.S. House votes counted inside this Place. “Vote lead” is the local lead here, not necessarily the winner of the full contest.
Buffalo Grove · how this place’s counties split between candidates in each party’s presidential nominating contest, cycle by cycle. A primary is a contest inside one party, so it has no Democratic–Republican margin and is not part of the general-election record above.
Akashic reports votes cast, not delegates awarded. The two can disagree: Clinton led the 2008 national primary popular vote by less than half a point and did not win the nomination.
Primary returns are published at county grain and there is no roll-up above it. Each cell counts how many of this place’s counties a candidate led — a count of records, not a vote total. Who led the place as a whole is not knowable from these returns, because county rows carry a leader and a lead but no per-candidate votes.
Presidential nominating contests in Buffalo Grove, by party and cycle.
○no contest record — Akashic holds no result for that party and cycle here. It is not a claim that no contest was held. Telling apart a contest that was cancelled, one that went uncontested, and one simply not yet ingested needs a nominating-contest calendar, which is a separate ingest from results and does not exist yet.
Republican presidential primaries are not yet ingested — the Republican series runs from 1856 and is in scope. The row is kept so its absence is visible: a Democratic-only panel would otherwise read as though no one else held a contest.
Akashic carries 10 states for 2012 and 3 states for 2024. Cycles in which an incumbent president seeks renomination are thin by nature — few states run a contested primary — so a sparse column is politics, not a hole in the record.
County returns carry a leader and a lead over the runner-up, and nothing more. The full candidate field with vote shares is published at state grain — follow a cycle above to the state contest for it.
Buffalo Grove sits across the Lake-Cook county line, drawing professional households whose voting patterns have tracked the broader suburban realignment visible throughout northeastern Illinois over the past decade.
Across the recorded series it reached a Democratic high of 35.3 points in 2008. Between 2020 and 2024 the city moved 4.4 points toward the Republican candidate; the 2024 margin was 29.1 points.
A population of 42,891, a 59% non-Hispanic-white share, and a median household income of $129,395 describe the city. The city's voting pattern over the last decade is most similar to that of Vernon Hills and Hoffman Estates.
Akashic
Political twins — cities
The cities whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
In 2024, Buffalo Grove, Illinois voted Democratic by 29.1 points (D+29.1), carried by the Democratic candidate. Out of 19,344 votes cast, 12,284 went Democratic and 6,650 went Republican.
How many people live in Buffalo Grove, Illinois?
Buffalo Grove, Illinois has a population of 42,891 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Buffalo Grove, Illinois?
Median household income in Buffalo Grove, Illinois is $129,395 — above the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Buffalo Grove, Illinois?
Akashic tracks 6 presidential elections in Buffalo Grove, Illinois from 2004 to 2024. Of those, 6 went Democratic and 0 went Republican.
