Our project to calculate the presidential election results by congressional district makes a stop in Oklahoma, which recently certified its official results. (Ballotpedia has a list of state certification deadlines.) We have a chart of all 435 congressional districts here, which also includes results from 2012. That's the page you'll want to bookmark, since we'll be updating it continuously.
For the fourth presidential election in a row, the GOP nominee carried every single one of Oklahoma’s 77 counties. Donald Trump defeated Hillary Clinton 65-29, a slightly larger margin than Romney’s 67-33 performance here four years ago. Trump unsurprisingly carried all five congressional districts with ease, and all five GOP incumbents were decisively re-elected.
The 2nd District in eastern Oklahoma’s Little Dixie area saw the largest swing toward the GOP between 2012 and 2016. Romney took the seat by an already-formidable 68-32, and Trump did even better by winning 73-23. For decades, the 2nd was relatively friendly to Democrats. In 2000, Al Gore won several of the counties that make up the 2nd while coming up short everywhere else. As recently as 2010, Democrat Dan Boren (a possible 2018 gubernatorial candidate) won re-election in this seat. However, Republican Rep. Markwayne Mullin took the seat after Boren retired the next cycle, and it looks unlikely it’ll be going anywhere anytime soon.
The one possible silver lining in the Sooner State for Team Blue is the 5th District, based in Oklahoma City and represented by Rep. Steve Russell. Romney won it 59-41, while Trump carried it by a smaller 53-40 margin. But the least-Republican district in Oklahoma is still pretty damn red, and it will probably be a long time before Democrats make a serious play for it.