In the 2014 Republican primary, Doug Underhill beat two-term County Commissioner Gene Valentino by earning 62.51 percent of the vote. Four years later, he’s the incumbent edge out well-financed challenger Alan McMillan with only 51.68 percent.
Underhill improved his percentage of the vote at only two precincts–Myrtle Grove United Methodist (2.1%) and Holy Spirit Catholic Church (2.9%). He lost the biggest percentage of votes at Warrington United Methodist (-28.2%), County Complex (-18.2%) and Warrington Presbyterian (-18.2%).
On Perdido Key – where Underhill had been battling residents and McMillan supporters over opening a beach access, Underhill received 50.6 percent of the vote, down 7.7 percent from four years ago. The commissioner won the precinct (#105) by only 12 votes. In 2014, he won it by 125 votes.
| Precinct | 2014 | 2018 | ||
| PRECINCT 1 | Pleasant Grove Baptist | 67.1% | 52.2% | -15.0% |
| PRECINCT 3 | Myrtle UMC | 60.5% | 62.6% | 2.1% |
| PRECINCT 15 | County Complex | 70.1% | 51.9% | -18.2% |
| PRECINCT 24 | Warrington UMC | 72.7% | 44.5% | -28.2% |
| PRECINCT 32 | Sanders Beach | 65.5% | 53.8% | -11.7% |
| PRECINCT 54 | Elks Lodge | 61.0% | 43.4% | -17.6% |
| PRECINCT 67 | Holy Spirit Catholic | 52.0% | 54.9% | 2.9% |
| PRECINCT 71 | Warrington Presby. | 67.6% | 49.4% | -18.2% |
| PRECINCT 77 | Lexington Terrace | 62.0% | 52.4% | -9.6% |
| PRECINCT 80 | Myrtle Grove Baptist | 63.9% | 53.6% | -10.3% |
| PRECINCT 82 | Friendship Missionary | 75.0% | 57.7% | -17.3% |
| PRECINCT 83 | 1st Baptist Warrington | 65.5% | 49.2% | -16.3% |
| PRECINCT 104 | Mayfair | 67.5% | 58.5% | -9.1% |
| PRECINCT 105 | Perdido Bay UMC | 58.2% | 50.6% | -7.7% |