Will the Republican Party hold between 205 and 209 House seats after the 2026 midterm elections?
Yes at 6% on 1 Nov 2026, down 2 pts over the previous 7 days. 3 big jumps since 12 Oct 2026, listed below.
Data from Polymarket. Numbered dots are the jumps explained below.
Context
This prediction market asks whether the Republican Party will win between 205 and 209 seats in the U.S. House of Representatives following the 2026 midterm elections. The market resolves based on the official seat counts for the upcoming 120th Congress, including any runoffs and independents who caucus with the Republicans, according to the specific rules.
As the midterm elections approach on November 3, 2026, final rating changes show multiple competitive races shifting toward Democrats, while national polls and predictions continue to analyze potential outcomes and the possibility of a Democratic shift in Congress.
Key factors include the upcoming November 3, 2026 election date, final race ratings, and how independent members will choose to caucus if their decisions remain pending.
Sources: The Times: Who will win the 2026 midterm elections? Polls and predictions, Roll Call: Final rating changes: 63 races move toward Democrats, 1 toward Republicans, NewsNation: What happens if Democrats take Congress? Trump’s power explained, NBC News: Midterms 2026: Congress Polls and More, The Guardian: Are the US midterms going to see a blue wave of Democrats winning seats – or a blue flood?
Written by AI from the linked news sources and checked automatically, not by a person.
What could move it next
No upcoming events listed for this market yet.
Price jumps explained
-
16 Oct 2026
Cook Political Report Shifts House Seats Away From GOP
The chance of the Republican Party holding between 205 and 209 House seats increased after the Cook Political Report shifted eleven House seats away from the GOP. This rating adjustment influenced expectations regarding the final distribution of seats following the midterm elections.
Sources: The Hill: Cook Political Report shifts 11 House seats away from GOP
After 24 h: held. After 7 days: reverted.
-
13 Oct 2026
Republican House Seat Odds Drop After Power Ranking Update
The likelihood that the Republican Party will hold between 205 and 209 House seats declined following new reports and rankings regarding the congressional elections. Media outlets highlighted that top G.O.P. groups pulled support from first-term House incumbents, and power rankings indicated potential trouble for the party in the House.
Sources: The New York Times: Top G.O.P. Groups Pull Support From First House Incumbents, Fox News: Fox News Power Rankings: As the House falls, the Senate stays in play
After 24 h: held. After 7 days: reverted.
-
12 Oct 2026
GOP House Majority Focus of Midterm Analysis
The chance of Republicans holding between 205 and 209 House seats rose as multiple outlets published analysis on key races that could determine control of the U.S. House of Representatives. Outlets including Decision Desk HQ and The Washington Post highlighted the competitive battlegrounds influencing the balance of power.
Sources: Decision Desk HQ | Substack: 🔵 🔴 Democrats’ would-be House majority depends on Trump-won districts, U.S. News & World Report: Factbox-Ten Key US House Races That Could Decide the 2026 Midterms
After 24 h: partly reverted. After 7 days: held.
Written by AI from the linked news sources and checked automatically, not by a person.
Other markets in “Republican House seats after the 2026 midterm elections?”
Questions about this market
What are the odds for “Will the Republican Party hold between 205 and 209 House seats after the 2026 midterm elections”?
On 1 Nov 2026, Polymarket traders priced Yes at 6%, which means they saw about a 6 in 100 chance. That was down 2 points over the previous 7 days. The live price is shown in the chart at the top of this page.
Why did the odds move recently?
The latest explained move was on 16 Oct 2026, from 16% to 24%: Cook Political Report Shifts House Seats Away From GOP. The chance of the Republican Party holding between 205 and 209 House seats increased after the Cook Political Report shifted eleven House seats away from the GOP. Every big move is listed under “Price jumps explained” (this one is number 3).
Do big jumps in this market usually hold?
Of the 3 big jumps old enough to check, 2 held after 24 hours (kept at least 70% of the move). The rest partly or fully reverted.
How does this market resolve?
This market will resolve according to the Republican Party’s seat count in the U.S. House of Representatives as a result of the 2026 United States midterm election scheduled for November 3, 2026. The full Polymarket rules are at the bottom of this page.
When does this market end?
Polymarket lists 4 Nov 2026 as the end date. It can settle earlier or later if the rules say so, for example when an official result comes in.
Can I bet on this market on predictionwave?
No. predictionwave only explains the odds. The market itself runs on Polymarket, and trading there is not allowed in every country.
How this market resolves (Polymarket rules)
This market will resolve according to the Republican Party’s seat count in the U.S. House of Representatives as a result of the 2026 United States midterm election scheduled for November 3, 2026. The seat count includes all House elections in the 2026 United States midterm election that elect voting members and determine representation in the upcoming 120th Congress. Where a seat is decided by a runoff, the runoff result will determine attribution of that seat. Seats are attributed to the party under which the member was elected. If a member-elect changes party affiliation, or vacates their seat, between election day and the formal organization of Congress, the seat is attributed to the party under which the member was elected. House members elected as independents who formally caucus with, or, for newly elected members, who announce their intent to caucus with, the Republican party are included in the count. If the caucus decisions of members of the House elected as independents cannot be determined on the date of the election, this market may remain open until the earlier of (i) an announcement from the relevant members of their intents to caucus, or (ii) January 4th, 11:59 PM ET of the following calendar year. If no such announcement is made by January 4th, 11:59 PM ET of the following calendar year, the member will not count towards the seat count of any party. The resolution sources for this market will be official information from relevant state electoral authorities, the United States Congress, and a consensus of credible reporting.