Newtown is a city in Sullivan County, Missouri, United States.

[6] Newtown is located in the northwest corner of Sullivan County along Missouri Route 139 and just to the west of Medicine Creek.

[7] The Chicago, Milwaukee, St. Paul and Pacific Railroad passes the east side of the location.

[8] According to the United States Census Bureau, the city has a total area of 0.25 square miles (0.65 km2), all land.

32.4% of all households were made up of individuals, and 12.2% had someone living alone who was 65 years of age or older.

33.7% of all households were made up of individuals, and 14.0% had someone living alone who was 65 years of age or older.

About 3.2% of families and 10.6% of the population were below the poverty line, including 7.8% of those under the age of eighteen and 25.5% of those 65 or over.