Onondaga County is part of the Syracuse, NY Metropolitan Statistical Area.
The name Onondaga derives from the name of the Native American people who lived here, who called themselves Onoda'gega, sometimes spelled Onontakeka. The word means "People of the Hills." Sometimes the term was Onondagaono ("The People of the Hills"). Haudenosaunee (Iroquois) people continue to reside in a separate nation within Onondaga County.
As of the census of 2000, there were 458,336 people, 181,153 households, and 115,394 families residing in the county. The population density was 587 people per square mile (227/km²). There were 196,633 housing units at an average density of 252 per square mile (97/km²). The racial makeup of the county was 84.78% White, 9.38% African American, 0.86% Native American, 2.09% Asian, 0.03% Pacific Islander, 0.89% from other races, and 1.97% from two or more races. Hispanic or Latino of any race were 2.44% of the population. 17.5% were of Italian, 16.2% Irish, 12.4% German, 9.4% English and 6.0% Polish ancestry according to Census 2000. 91.4% spoke English, 2.4% Spanish and 1.1% Italian as their first language.
There were 181,153 households out of which 31.90% had children under the age of 18 living with them, 46.90% were married couples living together, 12.90% had a female householder with no husband present, and 36.30% were non-families. 29.40% of all households were made up of individuals and 10.80% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 3.07.
In the county the population was spread out with 25.80% under the age of 18, 9.50% from 18 to 24, 28.80% from 25 to 44, 22.10% from 45 to 64, and 13.80% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 91.70 males. For every 100 females age 18 and over, there were 87.70 males.
The median income for a household in the county was $40,847, and the median income for a family was $51,876. Males had a median income of $39,048 versus $27,154 for females. The per capita income for the county was $21,336. About 8.60% of families and 12.20% of the population were below the poverty line, including 15.50% of those under age 18 and 7.10% of those age 65 or over.
Demographic trends (2006): County population has decreased from a high in 1970. Increasing number of housing units apparently is due to smaller family units and more individuals living alone. While the City of Syracuse population has declined, some suburban towns have grown.