Allendale is a town in eastern Worth County, Missouri, United States.

[7] Allendale is located on Missouri Route T just north of Missouri Route 46 six miles east of Grant City and 7.5 miles southwest of Hatfield in adjacent Harrison County.

[8] According to the United States Census Bureau, the village has a total area of 0.57 square miles (1.48 km2), all land.

20.0% of all households were made up of individuals, and 4% had someone living alone who was 65 years of age or older.

34.6% of all households were made up of individuals, and 19.2% had someone living alone who was 65 years of age or older.

Out of the total population, none are under the age of 18 or of those 65 and older were living below the poverty line.

According to tradition in Allendale, every 4th of July, men from the local community get together and cook a breakfast for everyone to enjoy.