The following data is from the 2018 election National Exit Polls.
| % of electorate | Republican | Democrat | |
| Men | 48% | 51% | 47% |
| Women | 52% | 40% | 59% |
| White Men | 35% | 60% | 39% |
| White Women | 37% | 49% | 49% |
| Ages 18-44 | 35% | 36% | 61% |
| Ages 45+ | 65% | 50% | 49% |
| Whites | 72% | 54% | 44% |
| African Americans | 11% | 9% | 90% |
| Latinos | 11% | 29% | 69% |
| High school or less | 23% | 51% | 48% |
| Some college | 36% | 49% | 50% |
| College + | 41% | 39% | 60% |
| Northeast | 20% | 37% | 61% |
| Midwest | 25% | 50% | 48% |
| South | 31% | 52% | 47% |
| West | 24% | 38% | 60% |
| Urban | 32% | 32% | 65% |
| Suburban | 51% | 49% | 49% |
| Rural | 17% | 56% | 42% |
| Republicans | 33% | 94% | 6% |
| Independents/Others | 30% | 42% | 54% |
| Democrats | 37% | 4% | 95% |