High Quality Content by WIKIPEDIA articles! Walnut Grove is a city in Greene County, Missouri, United States. The population was 630 at the 2000 census. It is part of the Springfield, Missouri Metropolitan Statistical Area.According to the United States Census Bureau, the city has a total area of 0.6 square miles (1.5 km²), all of it land.As of the census of 2000, there were 630 people, 264 households, and 165 families residing in the city. The population density was 1,124.1 people per square mile (434.4/km²). There were 290 housing units at an average density of 517.5/sq mi (199.9/km²). The racial makeup of the city was 96.83% White, 2.38% Native American, 0.16% Asian, 0.32% from other races, and 0.32% from two or more races. Hispanic or Latino of any race were 0.48% of the population.