race were 4.8% of the population. The top reported ancestries were Irish (26.7%, up 9.3% from 2000), English (17.4%, up 2.6%), Portuguese (14.6%, down 8.2%), Italian (13.5%, up 3.4%), and German (12.5%, up 3.6%). There were 1,765 households (down 3.9%), out of which 416 (23.6%) had families, 115 (6.5%) had children under the age of 18 living within them, and 76.4% were non-families. The average household size was 1.64 persons/household, and the average family size was 2.55. The distribution of the population, broken down by age and gender, is shown in the population pyramid. In 2010, 6.8% of the population was under the age of 18, and the median age was 52.3. There were 1,602 males and 1,340 females. For 2011, the estimated median income for a year-round household in the town was $46,547, with a mean household income of $74,840. For families, the median income was $87,228, and the mean is $84,050. For nonfamily households, the median income was $42,375, and the mean, $71,008. Median earnings for male full-time, year-round workers was $49,688, versus $36,471 for females. The per capita income for the town was $41,488. About 2.1% of families and 15.4% of the population were below the poverty line, including 26.0% of those under age 18 and 7.5% of those age 65 or over. Provincetown's ZIP code has the highest concentration of same-sex couple households of any ZIP code in the United States. Demographics in a resort town Data from traditional demographic sources like the U.S. Census, municipal voting rolls and property records may not accurately portray the demography of resort towns. They often reveal unusual results, as in this case, where the number of housing units far exceeds the Town's total population, where that number of housing units rose 15% while the population dropped 14%, and where nearly 61% of the housing stock is vacant, with 53% designated "for seasonal, recreational, or occasional use", according to the census. In the decade spanning the years 2000 through 2010, Provincetown's small year-round population declined 14.3% from 3,431 to 2,942, yet during the summer months, population estimates vary wildly, ranging from 19,000 to 60,000. Census figures are unable to capture these dynamic population fluctuations that are associated with seasonal tourism. Part-time residents, which includes non-resident property owners and seasonal residents, are not counted in the census. Arts and culture In 1940, Catharine Sargent Huntington, Edwin Pettit, and Virginia Thoms founded