Voters in the city of Denton and nearby Krum will choose between Republican U.S. Rep. Ronny Jackson and Democrat Mark Nair for the 13th Congressional District seat on Tuesday, Nov. 3. Friday, Oct. 30, is the final day of early voting.
Where the district reaches in Denton County
The 13th District under the congressional map lawmakers enacted in 2025 is anchored in the Panhandle and the Wichita Falls area. According to Texas Legislative Council reports on the plan, it takes in 36 entire counties plus pieces of Denton and Wise counties.
The Denton County share held 149,791 residents at the 2020 census, about 16.5% of the county. Roughly 93% of the city of Denton's population, or 129,994 people, falls inside it, along with all of Krum. The council's tables put none of Corinth or Sanger in the district.
The rest of Denton County is split between the 4th and 26th districts, so a voter's sample ballot shows which race applies at a given address.
Ronny Jackson
Jackson was first elected to the seat in November 2020 and is seeking another term. Raised in Levelland, he is an emergency medicine physician who spent 25 years in the Navy, served as physician to Presidents Barack Obama and Donald Trump, and was Trump's chief medical advisor before retiring from the Navy in December 2019, according to his House and campaign biographies.
He sits on the Armed Services, Agriculture, Foreign Affairs and Intelligence committees.
His campaign site lists border security, gun rights, opposition to abortion, agriculture, oil and gas production, health care costs, a congressional term limits pledge, veterans' benefits and reduced federal spending as priorities. It highlights defense employers in the district, naming Pantex, Bell Helicopter and Sheppard Air Force Base, and says the One Big Beautiful Bill carried two agriculture measures he wrote.
Mark Nair
Nair, a Democrat, is a former Amarillo City Council member who says he has lived in Amarillo for 30 years.
His campaign describes him as an inventor and entrepreneur who holds several patents, spent more than two decades leading innovation at Amarillo employer Anderson Merchandisers, taught economics and software development at Amarillo College, and mentors startup founders through programs at the National Science Foundation and the Texas Tech Innovation Hub.
His platform calls for returning tariff authority to Congress, setting federal rules for artificial intelligence and data privacy, moving toward Medicare for All with more money for rural hospitals, limiting corporate purchases of single-family homes, banning stock trading by members of Congress, a path to citizenship for immigrant families who follow the law, free community college, and federal help for aquifer and water projects.
His campaign says he does not accept corporate PAC money.
