Based on official results from Harris County and Montgomery County, Tomball ISD incumbents were re-elected as Board of Trustees during the November 6, 2018 election.
- Michael Pratt won Position 2 with a total of 9,354 votes.
- John E. McStravick won Position 3 with a total of 8,892 votes.
- Mark Lewandowski won Position 4 with a total of 11,694 votes.
Kathy Handler (14,385 votes) and Lee McLeod (14,459 votes) were also re-elected to Board of Trustee positions No. 1 and No. 7, respectively, after running unopposed.
The results were canvassed on Nov. 16, 2018 at 10:20 a.m.