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Sam Stevenson

By Sam Stevenson

Associate News Editor

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With 100 days left until the midterms on November 3, a Newsweek analysis has identified 100 counties that sit at the center of the battle for Congress.

The question of who controls Congress from next year may turn less on broad swing states than on a narrower set of communities: suburban areas where President Donald Trump's 2024 margins were thin, fast-growing metro counties that anchor House battlegrounds, and local political bellwethers that often provide an early indication of where the electorate is moving.

Newsweek's analysis combines competitive House battleground districts, Senate battleground states, close 2024 presidential results and recent special-election signals using data from the Cook Political Report, Ballotpedia, BallotWire and Dave Leip’s Atlas of U.S. Presidential Elections.

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Each category was converted into points, with closer contests and stronger signs of competitiveness generating higher scores.

The combined totals were then used to rank the states and districts most likely to be pivotal in the 2026 midterm elections, with some counties emerging repeatedly across multiple battlegrounds.

Democratic and Republican campaign committees, Senate candidates and House hopefuls are already targeting many of the places identified in the analysis.

A Republican National Committee (RNC) strategist told Newsweek that while Republicans tend to think in terms of congressional districts rather than counties, many of the counties identified in the analysis likely overlap with the districts expected to decide control of the House.

“This November will be a choice between communism and common sense,” RNC spokeswoman Delanie Bomar told Newsweek in an emailed statement.

“As Democrats lunge further to the Left, and with freedom, public safety, and cost of living on the line, Republicans are on offense and ready to defy history.”

The list of all 100 counties seen in the map can be found at the bottom of this article.

Use the map below to explore where Newsweek identified as key to the 2026 midterms.

The list is not a forecast, but a county-level guide to the places where small shifts in turnout or margins could have national consequences.

Maricopa County in Arizona, Northampton County in Pennsylvania, Scott County in Iowa, Eaton County in Michigan and Hidalgo County in Texas all ranked among the strongest candidates to shape the political story of 2026.

A Democratic strategist told Newsweek that many of these counties have become increasingly important, saying that they aligned with the party's understanding of the most competitive terrain in the 2026 House battle.

And campaign organizations are already drawing up similarly expansive maps.

The Democratic Congressional Campaign Committee (DCCC) told Newsweek that it has identified 46 Republican-held seats as its "Districts in Play," while Democratic state legislative strategists say they are tracking hundreds of competitive races nationwide—evidence of how they increasingly view the 2026 battlefield as a contest fought in a relatively small number of communities.

The concentration of campaign resources is another reason counties matter. An RNC campaigner told Newsweek that resources are increasingly focused on districts won by narrow margins.

Republican Elephant and Democratic Donkey political party symbols on two small flags laying on the American Flag. - stock photo

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The Counties at the Center of the House Battle

Few examples are more striking than Maricopa County, Arizona**.**

Trump carried the county by 3.48 percentage points in 2024, making it one of the most closely watched counties in the state.

It is also central to multiple competitive House districts around Phoenix, the state's capital and largest city.

The open-seat race to replace Republican Representative David Schweikert has emerged as one of the Democrats' top pickup opportunities.

Democrat Amish Shah is hoping to capitalize on growing Democratic strength in portions of Maricopa County, while Republican Jay Feely, a former NFL kicker backed by Trump, is seeking to keep the suburban Phoenix-area 1st Congressional District in GOP hands.

In Pennsylvania's Lehigh Valley**, Northampton County** and Lehigh County emerged as two of the strongest candidates in the analysis.

Trump carried Northampton by 1.77 points, while former Democratic Vice President Kamala Harris carried neighboring Lehigh by 2.69 points.

Both counties sit inside one of the most competitive political districts—Pennsylvania's 7th, where Republican Representative Ryan Mackenzie faces Democrat Bob Brooks, a firefighter union leader and former Bethlehem firefighter—in the country and are likely to attract enormous attention from both parties in 2026.

Iowa produced several counties that ranked highly.

Trump won Scott County by 3.88 points and Dallas County by 4.72 points. Both counties sit inside competitive House terrain while also belonging to a Senate battleground state.

Polk County, home to Des Moines, is less competitive politically but remains one of the state's most important vote-producing counties.

Republican Representative Mariannette Miller-Meeks faces Democrat Christina Bohannan in a rematch of one of 2024's closest House races in the country. Bohannan previously came within about 800 votes of unseating Miller-Meeks. Iowa's 1st District includes the Quad Cities area in Scott County.

Republican Representative Zach Nunn is defending his seat against Democratic nominee Sarah Trone Garriott, a state senator from West Des Moines, in the 3rd District anchored by Polk County and the fast-growing suburban communities of Dallas County.

Michigan's Eaton County also stood out. Trump carried it by just 3.14 points, making it one of the strongest examples of a county that combines House battleground relevance with a narrow presidential margin.

Republican Representative Tom Barrett is seeking a second term in one of Michigan's premier battleground districts. The 7th District seat, centered on Lansing and surrounding communities in Ingham and Eaton counties, is expected to be highly competitive. Democrats will choose their nominee in the August 4 primary, with former U.S. Ambassador to Ukraine Bridget Brink, former Navy SEAL Matt Maasdam, and political organizer William Lawrence competing for the place.

South Texas featured prominently as well. Trump carried Hidalgo County by 2.87 points and Cameron County by 5.80 points in 2024.

In the 15th District, Republican Representative Monica De La Cruz faces Democrat Bobby Pulido, the Tejano music star who won the Democratic nomination and has become one of the party's highest-profile recruits in South Texas. Centered on Hidalgo County, including McAllen and Edinburg, the district sits at the heart of the Rio Grande Valley. Despite the district's Republican lean, analysts have identified Pulido as a potentially strong challenger because of his local name recognition and crossover appeal.

Texas' 34th District (Cameron County) sees Democratic Representative Vicente Gonzalez seeking reelection against Republican Eric Flores, a former assistant U.S. attorney and Army National Guard veteran.

Stock image: Official Ballot Drop Box at voting location in the United States.

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Senate Battlegrounds Run Through Key Metropolitan Counties

The Senate map introduces a different set of counties.

Rather than focusing on congressional districts, statewide contests depend heavily on large suburban and metropolitan counties capable of producing hundreds of thousands of votes.

Georgia offers one of the clearest examples and is among the Senate battlegrounds identified by Ballotpedia. Democratic Senator Jon Ossoff, the only Democratic Senate incumbent defending a seat in a state won by Trump in 2024, faces Republican Representative Mike Collins.

Trump won the state in 2024, but several large counties remain essential to Democratic statewide hopes.

Cobb County voted Democratic by 14.88 points, Gwinnett County by 16.51 points and Fulton County by 44.86 points.

Together they form a critical part of the Atlanta metropolitan area that often determines statewide outcomes.

Michigan presents a similar dynamic.

Oakland County voted Democratic by 10.58 points in 2024, while neighboring Macomb County moved in the opposite direction and backed Trump by 13.69 points.

Those contrasting political profiles make both counties central to understanding statewide coalition building in Michigan. Michigan is also among the Senate battleground states highlighted by Ballotpedia.

With Democratic Senator Gary Peters retiring, Michigan is set to host one of the most competitive Senate races of the 2026 cycle. Republican Mike Rogers, a former congressman and frequent statewide contender, is the GOP's presumptive nominee, while Democrats will choose between Representative Haley Stevens and former public health official Abdul El-Sayed in the August 4 primary.

North Carolina's Mecklenburg County, anchored by Charlotte, backed Harris by 32.67 points, while nearby Wake County, home to Raleigh, backed Harris by 25.44 points.

Republican candidates often compensate elsewhere in the state, also listed among Senate battlegrounds for 2026, making turnout and margins in both counties crucial metrics on election night.

Republican Michael Whatley, the former RNC chairman, faces former Democratic Governor Roy Cooper in one of the most important Senate races of the 2026 cycle. Both candidates cleared their primaries with little difficulty,

Nebraska and Maine also produced notable counties.

Douglas County, which includes Omaha, voted Democratic by 10.17 points and sits inside Nebraska's second congressional district, one of the most competitive House districts in the country.

In Nebraska, one of the nation's most reliably Republican states, GOP Senator Pete Ricketts is seeking a full term against independent challenger Dan Osborn, a mechanic and labor leader who mounted a surprisingly strong Senate bid in 2024. The race effectively became a two-way contest after the Democratic nominee withdrew.

Meanwhile, Cumberland County in Maine backed Harris by 35.30 points and remains a major vote-producing county in a state expected to host another closely watched Senate contest.

Republican Senator Susan Collins is seeking another term against former Maine Senate president Troy Jackson, who has emerged as Democrats' leading candidate after Graham Platner suspended his campaign.

Where Trump's Coalition Faces Its Biggest Tests

One recurring theme in the research was the importance of counties where Trump prevailed, but only narrowly.

Those communities may offer some of the clearest clues about whether Democrats are making gains or Republicans are consolidating their 2024 coalition.

Examples include:

A Republican campaign strategist told Newsweek that many of the counties identified in the analysis were carried by Trump in 2024, arguing that the president's continued popularity among Republican voters remains a significant factor in the political landscape heading into the midterms.

What the Special-Election Map Suggests

Another layer in the project came from special-election performance.

According to Ballotpedia, party-control changes in state legislative special elections since 2025 have occurred in states including Florida, Arkansas, Georgia, Iowa, Pennsylvania, Texas, New Hampshire and Mississippi.

The analysis does not assume those outcomes will automatically translate into congressional or Senate races, but they provide clues about where political energy and voter engagement may be shifting.

Because special elections often occur in lower-turnout environments, they should be treated as signals rather than forecasts.

Even so, they offer one of the few real-world tests of political momentum between national election cycles.

Democratic groups argue that the battleground is broader than many voters realize.

Heather Williams, president of the Democratic Legislative Campaign Committee (DLCC), told Newsweek that "2026 is a once-in-a-generation opportunity to fundamentally shift the balance of power in state legislatures nationwide."

Williams said Democrats had already "flipped 30 seats since Trump was elected" and were now building on that momentum ahead of November.

She added that the DLCC is supporting "hundreds of must-win races around the country this November."

The organization told Newsweek it is currently tracking more than 500 districts nationally and has identified more than 160 target races so far, and will continue to roll out many more target races in the next few months, arguing that the most competitive contests are spread across a much wider map than traditional swing-state narratives suggest.

That assessment reflects part of the logic behind Newsweek's county-level approach.

A separate Democratic strategist pointed to recent special elections as evidence that areas previously considered safe for Republicans could become more competitive when voters were focused on affordability and economic issues.

What Happens Next

No county decides a national election on its own.

But modern campaigns increasingly revolve around identifying communities where a few thousand votes can change the balance of power.

A Democratic campaign source argued that concerns about household finances and the cost of living were likely to be the dominant issue influencing voters in many of the counties identified by the analysis.

Meanwhile, a Republican campaign strategist told Newsweek that while the party was confident in its position, it recognized the historic challenges facing the party in power.

"Historically, whoever the party in power is underperforms in the midterms," the RNC campaign source said, adding that Republicans hope strong turnout among Trump supporters can help offset those headwinds.

As spending accelerates and candidates begin focusing their resources on the most competitive terrain, many of the counties Newsweek has highlighted are likely to become familiar names long before voters head to the polls in November 2026.

Full List of 100 Counties Likely to Decide the 2026 Midterms

Some counties were included because they sit at the center of competitive races, while others were included because recent special elections or local political shifts may offer early clues about broader electoral trends.

Tier 1 – Core Battleground Counties

Counties that appeared across multiple indicators (competitive House districts, Senate battlegrounds, close 2024 results and sometimes special-election relevance).

Tier 2 – Major House and Senate Battleground Geography

Important counties inside competitive House districts or major Senate battleground states.

Tier 3 – Statewide Bellwethers and Major Vote Centers

Large vote-producing counties that may say more about statewide movement than a specific House race.

Tier 4 – Emerging Trend / Special-Election Signal Counties

Counties that made the list because of special-election trends, unusual political movement, or broader electoral signals rather than because they're individually among the most important counties in America.

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