Everglades Airpark Immokalee Airport Marco Island Airport Naples Municipal Airport Dade-Collier Training and Transition Airport (mostly unused) Major highways Interstate 75 U.S. Route 41 State Road 29 State Road 84 State Road 951 Demographics 2000 census As of the census of 2000, there were 251,377 people, 102,973 households, and 71,257 families residing in the county. The population density was 124 people per square mile (48/km2). There were 144,536 housing units at an average density of 71 per square mile (28/km2). , 86.06% of the population was White, 4.54% was Black or African American, 0.29% Native American, 0.62% Asian, 0.06% Pacific Islander, 6.19% from other races, and 2.23% from two or more races. Hispanic or Latino individuals (of any race) accounted for 19.61%. Languages spoken: 75.3% spoke English, 17.8% Spanish, 2.3% French Creole and 1.2% German as their first language. In 2000 there were 102,973 households, out of which 22.70% had children under the age of 18 living with them, 58.10% were married couples living together, 7.20% had a female householder with no husband present, and 30.80% were non-families. 24.50% of all households were made up of individuals, and 11.90% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.79. The county's population distribution by age was spread out but older than the U.S. as a whole, with 19.90% under the age of 18, 6.60% from 18 to 24, 24.60% from 25 to 44, 24.50% from 45 to 64, and 24.50% who were 65 years of age or older. The median age was 44.1 years. For every 100 females there were 100.30 males. For every 100 females age 18 and over, there were 99.20 males. The median income for a household in the county was $48,289, and the median income for a family was $54,816. Males had a median income of $32,639 versus $26,371 for females. The per capita income for the county was $31,195. About 6.60% of families and 10.30% of the population were below the poverty line, including 16.20% of those under age 18 and 4.30% of those age 65 or over. 2010 census The county continues to experience significant growth and is becoming increasingly diverse. As of the 2010 census, the county's population had increased to 321,520, an increase of 27.9% over the 2000 census. , the United States Census estimates the county's