Over the full last decade (2014-2024), income growth in Republican- and Democratic-represented states was statistically indistinguishable; a small, real Republican-state edge appears only in the most recent four years

Summary

Over the last ten years (2014-2024), across the 50 states, income growth in places represented by Republicans and places represented by Democrats was statistically indistinguishable -- and if anything, Democratic-leaning states edged narrowly ahead, not Republican-leaning ones. Using BEA per-capita personal income, the 27 states with a Republican-leaning federal Composite Political Index (CPI) averaged +55.5% nominal growth 2014-2024, versus +57.8% for the 23 Democratic-leaning states (Welch's t-test, p=0.40 -- not significant). Using Census ACS median household income the two groups were essentially tied (+50.3% vs +49.7%, p=0.82). Classifying states instead by consistent 2016/2020/2024 presidential vote gives the same picture: 25 'Red' states averaged +54.7% per-capita income growth over the decade versus +58.0% for 20 'Blue' states (not significant, p=0.24; 6 'purple' swing states averaged +60.2%, highest of all three groups).

A real, statistically significant Republican-state edge does show up, but only in a much shorter and more recent window: 2020-2024, Red states averaged +25.4% per-capita income growth versus +23.5% for Blue states (p=0.03). That matches the direction (though not the magnitude) of recent partisan-economy commentary built on that same post-2020 period. It does not generalize to the full decade the question asks about.

A further check complicates any simple 'party X wins' framing: Democratic-leaning states started the decade with substantially higher income levels (~$48,500 avg per-capita income in 2014 vs ~$42,600 for Republican-leaning states), which on its own predicts SLOWER, not faster, percentage growth for Democratic states (poorer places mechanically converge/catch up faster). Once that starting-income level is held fixed in a regression, Democratic-leaning states show a modest but statistically significant excess growth advantage (~+0.048 percentage points of growth per point of CPI, p=0.005; leave-one-out sensitivity analysis confirms no single state drives this). In other words: the raw comparison is a rough tie partly BECAUSE red states' growth is not fully explained by their lower starting point either -- the two effects roughly offset over the full decade.

How this compares to the debate in the press and literature

This question sits inside a live, contested debate. A 2026 Independent Institute/Unleash Prosperity study by Richard Vedder and Nicholas Jadwisienczak, using 2020-2024 data and controlling for climate, industry mix, unionization, immigrant share and urbanization, reports that solidly Red states had "over 25 percent more growth in personal income" than Blue states in that period -- a claim amplified by Newsweek, the RNC's research page, and multiple opinion outlets. Our own uncontrolled replication of the SAME 2020-2024 window (above) finds the same DIRECTION -- Red states ahead -- but a much smaller raw gap (~8% relative, 25.4% vs 23.5%), consistent with Vedder's own framing that the effect only becomes large once several confounds are controlled for; our simpler design does not attempt that full covariate set.

On the other side, a peer-reviewed Public Choice study finds that national GDP growth has historically been faster when more state governments (and Congress) were held by Democrats, and coverage summarized by factually.co and the Indiana Capital Chronicle notes that states with more years of Democratic control score better on median household income and GDP per capita, while cautioning that correlation is not causation and that richer states may simply have started electing more Democrats. A Berkeley Economy & Society Initiative analysis independently confirms the income-level fact behind our starting-point control: in 2023 the average Blue state had a median household income of roughly $87,000 versus roughly $69,000 for the average Red state (a LEVEL comparison, not a growth-rate comparison) -- Blue states are richer to start with, which is exactly the convergence confound our regression addresses. The Hill and other pieces have made similar claims in both directions over different windows, underscoring that different studies use different periods, different definitions of 'red'/'blue', and different metrics -- which is a large part of why the answer depends so heavily on exactly how the question is specified.

Data, method and caveats

• Income measures: (1) BEA regional personal income (SAINC1, table econ.regional_income), state-level per-capita personal income, nominal dollars, 2014 vs 2024; (2) Census ACS 1-Year median household income (census.acs1_income), same years. Both are nominal; national CPI-U rose about 32.5% over 2014-2024 (via the adjust_inflation tool), so the ~50-58% nominal growth figures above correspond to roughly 17-19% REAL per-capita income growth nationally -- the Red/Blue GAP is essentially unchanged whether measured in nominal or real terms, since both groups face the same national inflation path.
• Political classification, method 1 (continuous): officials.state_political_index's Composite Political Index (CPI, -100=max Republican to +100=max Democratic), averaged across the six congresses spanning 2013-2024 (113th-118th) per state -- capturing the full decade of federal representation, not just a single election.
• Political classification, method 2 (categorical): a state is 'Red' if it voted Republican for President in all of 2016, 2020, and 2024 (officials.electoral_college_votes, NARA source), 'Blue' if Democratic all three times, else 'Purple'/swing (excluded from the two-group comparison, retained as a third bar).
• Grain and weighting: unweighted, one observation per state (n=50; DC excluded from the per-capita panel as an outlier city-state, included/excluded checks made no material difference). This is a state-level comparison of PLACES, matching how the question is framed ('places represented by...'), not a population-weighted national comparison -- a population-weighted version would be dominated by California, Texas, Florida and New York and is a different, also-defensible question.
• Regression / robustness: OLS of 2014-2024 % growth on (avg CPI, 2014 starting income level) for both income measures; leave-one-out sensitivity analysis (state-by-state) confirms the CPI coefficient's sign and significance are not driven by any single state (coefficient range 0.038-0.056 across all 50 leave-one-out refits, no sign flips, VIF max 1.7 -- no meaningful collinearity between CPI and starting income).
• Data-quality issue found and reported: econ.state_personal_income (the other BEA state income table in this warehouse) is declared to cover through 2024 but a direct scan showed it is actually only loaded through 1957 -- a genuine ETL gap, reported via report_issue. We used econ.regional_income instead, which is correctly loaded through 2024/2025.
• What this does NOT show: causation. Party control does not directly set income; it correlates with tax policy, regulation, migration, industry mix, and (per Berkeley's analysis) housing supply and cost of living, all of which move together with partisan lean. No study cited here, including ours, isolates a single causal channel with confidence at 50-state grain.