Marthasville is a city located in Warren County, in the state of Missouri (MO), United States. Nestled in the West North Central division of the Midwest region, it covers an area of 0.8 square miles (2.0 km²) and sits at an elevation of 496 ft. With a population of approximately 837 residents, Marthasville offers a peaceful, rural atmosphere.
The town's population is composed of about 51.37% males and 48.63% females, and it has a population density of 996.43 people per square mile (384.72/km²). Marthasville lies at a latitude of 38.63 and a longitude of -91.06, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (7.4%), followed by English (11.2%), German (51.5%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 63357.