 The most common ancestries in McAdoo are Polish (15.5%), Italian (14.1%), Slovak (10.6%), Irish (7.8%), and Greek (5.0%)

Of the 1,034 households 23.8% had children under the age of 18 living with them, 42.5% were married couples living together, 12.0% had a female householder with no husband present, and 40.3% were non-families.37.1% of households were one person and 20.9% were one person aged 65 or older.The average household size was 2.19 and the average family size was 2.89.