Are there any states with a single-party congressional delegation in both chambers in 2024?

1. A sharp rise in single‑party state delegations — record highs and what was reported

Smart Politics concluded on January 21, 2025, that there were 12 all‑Republican state delegations and 7 all‑Democratic state delegations after the 2024 cycle, and described this as the highest level of single‑party state congressional delegations in roughly 70 years. That analysis presents the headline finding that more states now send only one party to both chambers, a structural indicator of political consolidation at the state level. This count is the leading quantitative claim driving the answer that multiple states have single‑party delegations. Smart Politics framed that development as historically significant because it measures state‑level partisan homogeneity across both the House and Senate ^[1].

2. Examples named: states identified with unified delegations

A separate Smart Politics piece dated January 13, 2025, lists specific states that had single‑party delegations, naming Ohio, Montana, West Virginia, and Arizona among those with unified delegations following the 2024 elections. These enumerated examples show the phenomenon is geographically diverse, spanning Midwestern, Mountain West, and Appalachian states. Smart Politics also reported that only four states ended up with split Senate delegations — Maine, Pennsylvania, Vermont, and Wisconsin — underscoring why many states’ delegations became single‑party ^[2].

3. Cross‑checks and sources that could not verify everything

Ballotpedia and other election indexes provided comprehensive raw results and state‑by‑state comparisons but did not always present a ready‑made tally of states whose delegations were single‑party in both chambers; several of the analytic fragments supplied indicate insufficient or inconclusive presentation for that specific question. These sources serve as raw data repositories or comparative tools rather than narrative summaries, so they require aggregation to reproduce the Smart Politics counts. That means independent verification is possible but requires assembling House and Senate outcomes by state from those databases ^{[4] [5] [6]}.

4. National balance and the mechanics that produced unified delegations

Bloomberg Government’s reporting on the balance of power after 2024 emphasized that Republicans controlled both chambers of Congress and that seat flips in both House and Senate altered the composition of many state delegations — 17 House seats changed parties and four Senate seats flipped to Republicans per the analytic excerpt provided. Those national shifts help explain why more states ended up with single‑party delegations: when Senate pickups occur in states that already send a uniform party to the House, the delegation becomes wholly one party. The Bloomberg summary frames the structural outcome as a consequence of aggregated district and statewide results ^[3].

5. Media narrative and differing emphases among outlets

Mainstream reporting (for example, The Guardian’s election wrap) emphasized results and the practical consequence that the GOP secured a House majority in 2024, which aligns with analyses showing an increase in single‑party delegations. Different outlets stress different angles: Smart Politics focused on historical magnitude and counts; Ballotpedia and other data platforms provide raw inputs; mainstream outlets highlight the political control implications. Readers should note that analytical packages aggregate outputs differently, which can produce variation in how prominently single‑party delegations are reported even when the underlying results match ^{[7] [6]}.

6. What to watch and caveats on the counts

The Smart Politics numbers are the clearest published tally in the supplied materials and provide the direct affirmative answer that multiple states had single‑party delegations in both chambers in 2024, but reproducing the count requires matching each state’s House delegation and its two Senate seats as of the 119th Congress. Ballotpedia and other election tables can be used to validate the list, although several supplied analytic notes explicitly state they lack a ready‑made roster. Users seeking a state‑by‑state confirmation should cross‑check the Smart Politics list against primary result tables or Ballotpedia’s state delegation comparisons ^{[1] [4] [5]}.