Uniondale is a hamlet and census-designated place (CDP), as well as a suburb in Nassau County, New York, United States, on Long Island, in the Town of Hempstead. The population was 24,759 at the 2010 United States Census. Uniondale is home to Hofstra University's north campus.
Uniondale is located at 40°42′11″N 73°35′28″W (40.703097, −73.591070).
According to the United States Census Bureau, the village has a total area of 2.7 square miles (7.0 km2).
As of the census of 2000, there were 23,011 people, 6,026 households, and 4,826 families living in the CDP. The population density was 8,676.5 per square mile (3,352.7/km²). There were 6,201 housing units at an average density of 2,338.1/sq mi (903.5/km²). The racial makeup of the CDP was 26.97% White, 55.53% Black, 0.35% Native American, 2.10% Asian, 0.08% Pacific Islander, 9.95% from other races, and 5.01% from two or more races. Hispanic or Latino of any race were 22.86% of the population.
Of the 6,026 households 39.3% had children under the age of 18 living with them, 52.9% were married couples living together, 20.9% had a female householder with no husband present, and 19.9% were non-families. Of all households 16.0% were one person and 8.5% were one person aged 65 or older. The average household size was 3.66 and the average family size was 3.95.
The age distribution was 26.5% under the age of 18, 9.7% from 18 to 24, 29.3% from 25 to 44, 21.9% from 45 to 64, and 12.6% 65 or older.