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Your current U.S. Representative for NH-01 is Chris Pappas, a Democrat who has held the seat since January 2019. The current term runs until the next election, which is scheduled for November 3, 2026. 
Ballotpedia

Worth noting: Pappas is retiring from the House to run for U.S. Senate in 2026, so NH-01 is an open seat this cycle. There's a crowded primary field on both sides — nine Democratic candidates and five Republican candidates as of recent filings, with the primary set for September 8, 2026 — but Pappas remains your sitting representative until a new member is elected and sworn in. 
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Cited sources

• https://ballotpedia.org/United_States_House_of_Representatives_elections_in_New_Hampshire,_2026
• https://en.wikipedia.org/wiki/2026_United_States_House_of_Representatives_elections_in_New_Hampshire