Texas House District 66 includes portions of Dallas and Plano.
Republican incumbent Matt Shaheen was re-elected to the seat in 2018 by 0.58 percentage points.
In 2020, Shaheen defeated his 2018 opponent, Sharon Hirsch, by 1.21 percentage points.
| Sharon Hirsch (D) | Matt Shaheen (R) (I) | |
| Totals | ||
| Total Money Raised | $1,172,607 | $1,307,650 |
| Total Number of Donations | 13,927 | 370 |
| Average Donation Amount | $84.20 | $3,534.19 |
| In-District | ||
| Total Money Raised In-District | $69,106 | $32,250 |
| Total Number of Donations From In-District | 782 | 79 |
| Percentage Raised From In-District | 6% | 2% |
| Out-Of-District | ||
| Total Money Raised Outside District | $1,103,501 | $1,275,400 |
| Total Number of Donations Raised Outside District | 13,145 | 291 |
| Percentage Raised From Outside District | 94% | 98% |
| Expenditures | ||
| Total Expenditures | $615,241 | $448,609 |
| Total Votes (November 3 General Election) | 41,210 | 42,239 |
| Cost Per Vote | $14.93 | $10.62 |
| Cash-On-Hand | ||
| Cash-On-Hand | $117,182 | $225,394 |
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