It was one of the states that was able to keep the same number of congressional districts from the previous census (in the past, Oklahoma has had as many as nine House of Representatives seats). Following the 2018 elections, a Democratic challenger ousted a Republican incumbent, changing the congressional delegation to a 4-1 Republican majority.
In one of these states, the number of congressional districts remained consistent with the previous census (Oklahoma has had up to nine House seats in the past). Following the 2018 elections, a Democratic challenger succeeded over a Republican incumbent, resulting in a 4-1 Republican majority for the congressional delegation.