Riverside-San Bernardino-Ontario, CA · 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 Riverside-San Bernardino-Ontario, CA, 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.
voter registration
Registered voters
By party of registration, over time
Party registration · 2024D+8.4
vs
Presidential vote · 2024R+1.7
Riverside-San Bernardino-Ontario, CA registers Democratic but votes Republican — a 10-point gap between how voters register and how they vote, the signature of ancestral registration that trails realignment.
2,539,899 registered voters · 2024 · up from 2,445,247 in 2022
Domestic migration in Riverside-San Bernardino-Ontario, CA in Riverside-San Bernardino-Ontario, CA: net domestic migration by year
Year
Net domestic migration
2011
+14,877
2012
+4,057
2013
−1,061
2014
+9,142
2015
+7,340
2016
+14,232
2017
+21,166
2018
+20,580
2019
+12,256
2021
+25,700
2022
+5,403
2023
−3,671
2024
−45
2025
+2,797
Once reliably Republican exurban terrain, the Inland Empire has shifted markedly as Latino population growth and in-migration from coastal California have compressed margins in federal and statewide contests over the past two decades.
Across the recorded series it reached a Democratic high of 34.6 points in 1912 and a Republican high of 52.9 points in 1928. Between 2020 and 2024 the metro moved 10.8 points toward the Republican candidate; the 2024 margin was 1.7 points.
A population of 4,675,704, a 28% non-Hispanic-white share, and a median household income of $89,505 describe the metro. The metro's voting pattern over the last decade is most similar to that of Fresno, CA and Modesto, CA.
Akashic
Political twins — metros
The metros 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.
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
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All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Riverside-San Bernardino-Ontario, CA, California. Akashic. https://akashic.app/cbsa/40140/. Accessed May 20, 2026. License: CC BY 4.0.
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How did Riverside-San Bernardino-Ontario, CA, California vote in 2024?
In 2024, Riverside-San Bernardino-Ontario, CA, California voted Republican by 1.7 points (R+1.7), carried by the Republican candidate. Out of 1,702,119 votes cast, 813,896 went Democratic and 842,093 went Republican.
When did Riverside-San Bernardino-Ontario, CA, California last vote Democratic?
The most recent presidential election in which Riverside-San Bernardino-Ontario, CA, California voted Democratic was 2020.
How many people live in Riverside-San Bernardino-Ontario, CA, California?
Riverside-San Bernardino-Ontario, CA, California has a population of 4,675,704 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Riverside-San Bernardino-Ontario, CA, California?
Median household income in Riverside-San Bernardino-Ontario, CA, California is $89,505 — above the national median of $80,734. The California state median is $99,122.
What is the political history of Riverside-San Bernardino-Ontario, CA, California?
Akashic tracks 34 presidential elections in Riverside-San Bernardino-Ontario, CA, California from 1892 to 2024. Of those, 10 went Democratic and 23 went Republican.
