The town is the home to the Chatham Municipal Airport, which provides local service to other small airports on the Cape and islands. The nearest national and international air service can be reached at Logan International Airport in Boston. As of the census of 2000, there were 6,625 people, 3,160 households, and 1,886 families residing in the town. The population density was 408.4 people per square mile (157.7/km2). There were 6,743 housing units at an average density of 415.7 per square mile (160.5/km2). The racial makeup of the town was 96% White, 1.9% Black or African American, 0.2% Native American, 0.3% Asian, <0.1% Pacific Islander, 0.9% from other races, and 0.8% from two or more races. Hispanic or Latino of any race were 1.0% of the population. During the summer months (generally Memorial Day through Labor Day), the population of the town triples to approximately 20,000, not counting the additional transient tourist population hosted by the town's many hotels, inns, motels, and bed and breakfasts. Tourism and Hospitality along with Commercial Fishing make up the town's main industry. The town has a thriving commercial fish pier where day-boats unload fresh fish and lobster. There were 3,160 households, out of which 15.3% had children under the age of 18 living with them, 51.2% were married couples living together, 6.0% had a female householder with no husband present, and 40.3% were non-families. 34.7% of all households were made up of individuals, and 18.8% had someone living alone who was 65 years of age or older. The average household size was 2.00 and the average family size was 2.52. In the town, the population was spread out, with 13.3% under the age of 18, 4.4% from 18 to 24, 19.8% from 25 to 44, 28.2% from 45 to 64, and 34.3% who were 65 years of age or older. The median age was 54 years. For every 100 females, there were 89.3 males. For every 100 females age 18 and over, there were 85.4 males. The local K-12 school system has approximately 700 students, making for average high school grade sizes between 30 and 40 students.