Allendale is a city in Worth County, Missouri, United States. The population was 53 at the 2010 census, at which time it was a town.
Allendale is located at 40°29′5″N 94°17′24″W / 40.48472°N 94.29000°W / 40.48472; -94.29000 (40.484813, -94.290028).
According to the United States Census Bureau, the village has a total area of 0.57 square miles (1.48 km), all land.
As of the census of 2010, there were 52 people, 25 households, and 20 families residing in the village. The population density was 93.0 inhabitants per square mile (35.9/km). There were 35 housing units at an average density of 61.4 per square mile (23.7/km). The racial makeup of the village was 100.0% White.
There were 25 households of which 12.0% had children under the age of 18 living with them, 76.0% were married couples living together, 4.0% had a male householder with no wife present, and 20.0% were non-families. 20.0% of all households were made up of individuals and 4% had someone living alone who was 65 years of age or older. The average household size was 2.12 and the average family size was 2.40.
The median age in the village was 57.5 years. 15.1% of residents were under the age of 18; 0% were between the ages of 18 and 24; 17.1% were from 25 to 44; 39.6% were from 45 to 64; and 28.3% were 65 years of age or older. The gender makeup of the village was 50.9% male and 49.1% female.
As of the census of 2000, there were 54 people, 26 households, and 15 families residing in the town. The population density was 95.1 people per square mile (36.6/km²). There were 35 housing units at an average density of 61.6 per square mile (23.7/km²). The racial makeup of the town was 100 percent white.
There were 26 households out of which 15.4% had children under the age of 18 living with them, 53.8% were married couples living together, 3.8% had a female householder with no husband present, and 42.3% were non-families. 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. The average household size was 2.08 and the average family size was 2.73.
In the town the population was spread out with 16.7% under the age of 18, 3.7% from 18 to 24, 24.1% from 25 to 44, 31.5% from 45 to 64, and 24.1% who were 65 years of age or older. The median age was 51 years. For every 100 females, there are exactly 100 males. For every 100 females age 18 and over, there were 104.5 males.
As of 2000 the median income for a household was $30,833, and the median income for a family was $35,625. Males had a median income of $21,964 versus $14,375 for females. The per capita income for the town was $19,502. 3.1% of the population — but no families — are below the poverty line. Out of the total population, none are under the age of 18 or of those 65 and older were living below the poverty line.