In 2026, Harris County reached a combined half‑million voters for the first time in a midterm primary election.In the 2026 Primaries across both primaries, the number of mail and Election Day voters continued to decline, while in‑person early voting continued to rise. In the 2026 Republican Primary, the number of mail and Election Day voters continued to decline, while in‑person early voting continued to rise.In the 2026 the Democratic Primary, women outvoted men 62% to 38%.In the 2026 Republican Primary, men narrowly outvoted women 51% to 49%.The average age of the 2026 Democratic Primary electorate age was 52. The average age of the 2026 Republican Primary electorate was 63. In the 2026 Democratic Primary, 30% of voters were 39 years of age or younger surpassing the previous midterm record of 21% set in 2018. Voters 65 years of age or over also represented 30% of the Democratic electorate. In the 2026 Republican Primary, only 9% of voters were under 39, while 52% were 65 or older.Summary of Harris County 2026 Primary Voter Affiliation: An estimated 58% of Democratic primary voters had a history of participating in the Democratic Party, 39% had no prior primary voting history, and 4% most recently participated in the opposite party’s primary. Among Republican primary voters, an estimated 79% had a history of participating in the Republican Party, 19% had no prior primary voting history, and 3% most recently participated in the opposite party’s primary.
