Merwin is a village in Bates County, Missouri, and is part of the Kansas City metropolitan area within the United States.

[7] According to the United States Census Bureau, the village has a total area of 0.15 square miles (0.39 km2), all land.

There were 31 housing units at an average density of 206.7 per square mile (79.8/km2).

32.0% of all households were made up of individuals, and 8% had someone living alone who was 65 years of age or older.

28.1% of all households were made up of individuals, and 15.6% had someone living alone who was 65 years of age or older.

There were 23.3% of families and 27.4% of the population living below the poverty line, including 29.2% of under eighteens and 57.1% of those over 64.