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As of the census of 2000, there were 144,166 people, 50,831 households, and 38,784 families residing in the county. The population density was 277 people per square mile (107/km²). There were 56,528 housing units at an average density of 108 per square mile (42/km²). The racial makeup of the county was 95.70% White, 1.0% Black or African American, 0.11% Native American, 1.20% Asian, 0.02% Pacific Islander, 0.74% from other races, and 1.14% from two or more races. 3.30% of the population were Hispanic or Latino of any race. 20.4% were of Italian, 18.1% Irish, 16.0% German, 7.2% English, 5.9% Polish and 5.2% American ancestry according to Census 2000.
By 2006, 90.3% of the county population was non-Hispanic whites. The percentage of African-Americans was up to 1.7%. Asians were now 1.9% of the population. 5.3% of the population was Latino.
In 2000 There were 50,831 households out of which 39.9% had children under the age of 18 living with them, 65.0% were married couples living together, 8.0% had a female householder with no husband present, and 23.7% were non-families. 18.9% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. The average household size was 2.80 and the average family size was 3.24.
In the county the population was spread out with 27.9% under the age of 18, 6.2% from 18 to 24, 31.5% from 25 to 44, 25.3% from 45 to 64, and 9.1% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 98.0 males. For every 100 females age 18 and over, there were 95.6 males.
The median income for a household in the county was $67,266, and the median income for a family was $73,335 (these figures had risen to $79,434 and $89,302 respectively as of a 2007 estimate). Males had a median income of $50,395 versus $33,750 for females. The per capita income for the county was $26,992. About 2.8% of families and 4.0% of the population were below the poverty line, including 4.1% of those under age 18 and 5.4% of those age 65 or over.
Sussex County is served by a number of roads connecting it to the rest of the state and to both Pennsylvania and New York. Interstate 80 passes through the extreme southern tip of Sussex County. Interstate 84 passes just yards north of Sussex County, but never enters New Jersey.
New Jersey's Route 15, Route 23,Route 94, Route 181, Route 183, and Route 284 pass through the County, as does U.S. Route 206
Commuter Rail available from Netcong, New Jersey on the Morris & Essex Lines of New Jersey Transit. New Jersey Transit also aims to open up the Lackawanna Cutoff, which passes through Andover and Green Townships to commuter traffic, connecting Scranton, Pennsylvania with Hoboken, New Jersey and New York City.
Sussex County has four public-use airports, all privately owned and catering to recreational pilots. They are Sussex Airport, in Wantage Township, which has a runway of 3,499 feet, Newton Airport in Andover Township, Andover Aeroflex Airport also in Andover Township, and Trinca Airport in Green Township, which has a 1,900-foot grass runway.
Clear Channel Radio owns a cluster of four stations in the area.
FST Broadcasting Corp. owns WTBQ, just north of Vernon, NJ.
The radio station WNTI, 91.9 FM, is broadcast from Centenary College in Hackettstown (Warren County). It is a commercial free, public station playing progressive music. It can be heard throughout most of Sussex County. Calvary Chapel of Howell, NJ broadcasts WRDR The Bridge FM with towers in Northern New Jersey and Southern New York.
Heroin use has been on the rise and shows no signs of improvement despite efforts of law enforcement and community groups working to fight the problem.