Missouri's 18th Senate district
| Missouri's 18th State Senate district | |||
|---|---|---|---|
| Senator |
| ||
| Demographics | 90% White 3% Black 2% Hispanic 1% Asian 3% Multiracial | ||
| Population (2023) | 176,971 | ||
Missouri's 18th Senatorial District is one of 34 districts in the Missouri Senate. The district has been represented by Republican Cindy O'Laughlin since 2019 and she has served as president pro tempore since 2025.