Blencoe is a city in Monona County, Iowa, United States. The population was 224 at the 2010 census.
An early settler from Blencoe, Canada, named the town.
Blencoe is located at 41°55′55″N 96°4′54″W (41.931871, -96.081742).
According to the United States Census Bureau, the city has a total area of 0.76 square miles (1.97 km2), all land.
As of the census of 2010, there were 224 people, 99 households, and 70 families living in the city. The population density was 294.7 inhabitants per square mile (113.8/km2). There were 116 housing units at an average density of 152.6 per square mile (58.9/km2). The racial makeup of the city was 96.9% White, 0.4% Native American, 0.4% Asian, and 2.2% from two or more races. Hispanic or Latino of any race were 0.4% of the population.
There were 99 households, of which 23.2% had children under the age of 18 living with them, 48.5% were married couples living together, 16.2% had a female householder with no husband present, 6.1% had a male householder with no wife present, and 29.3% were non-families. 25.3% of all households were made up of individuals, and 8.1% had someone living alone who was 65 years of age or older. The average household size was 2.26 and the average family size was 2.63.