Oklahoma
5 congressional districts.
Map
- Very compact (0 to 19)
- Compact (20 to 39)
- Middle (40 to 59)
- Irregular (60 to 79)
- Very irregular (80 to 100)
Select a district for details.
Map used in 2026
2021 enacted plan (HB 1002)
- Drawn by
- the state legislature
- Enacted
- 2021-11-22
- Changed since 2024
- No
Source: All About Redistricting, Loyola Law School (secondary source) (checked 2026-11-04)
Districts
| District | Irregularity | National rank |
|---|---|---|
| OK-01 | Irregularity score 50 Middle of the pack | 205th least compact |
| OK-02 | Irregularity score 26 Compact | 340th least compact |
| OK-03 | Irregularity score 27 Compact | 336th least compact |
| OK-04 | Irregularity score 38 Compact | 282nd least compact |
| OK-05 | Irregularity score 41 Middle of the pack | 258th least compact |
Scores describe shape, not intent. How scores work
Oklahoma's senators
- Alan Armstrong, RepublicanSeat on the November 3, 2026 ballot: Kevin Hern, Republican, won and takes office January 3, 2027.
- James Lankford, Republican
Senators are elected by the whole state, so district lines don't change who they are. Senators serving as of November 6, 2026. Senators elected in November 2026 take office January 3, 2027. Where this comes from
Partisan fairness
How the 2024 presidential vote splits across these districts. Kamala Harris (Democrat) won 32.5% of the two-party vote. Donald Trump (Republican) carried all 5 districts.
When one party carries every district, the efficiency gap is large however the lines are drawn, since every vote for the other party counts as wasted. Declination needs districts won by both parties, so it can't be measured here.
- Efficiency gap
- 15.1% Favors Republicans
Counts each party's wasted votes: votes for a losing candidate, plus a winner's votes beyond the half needed to win. The gap is the difference between the two parties' wasted votes, as a share of all votes.
- Mean-median difference
- 0.9 points Favors Democrats
The gap between a party's average vote share across the districts and its share in the middle (median) district. When the middle district leans away from a party's average, that party's voters are packed into a few lopsided districts.
- Declination
- Not measurable
Compares how lopsided each party's wins are. A party that wins a few districts by huge margins and loses the rest narrowly is at a disadvantage. Runs from 0 (even) to 1.
Votes are 2024 presidential results by precinct, added up within each district. This state used the same districts in 2024 and 2026. These measures show how a map turns one election's votes into seats. They don't show why the lines were drawn, and they shift from one election to the next. How fairness scores work