Demarest, New Jersey

===2010 census===

The [[2010 United States census]] counted 4,881 people, 1,597 households, and 1,404 families in the borough. The [[population density]] was {{convert|2361.8|/sqmi}}. There were 1,659 housing units at an average density of {{convert|802.7|/sqmi}}. The racial makeup was 70.21% (3,427) [[White (U.S. census)|White]], 0.64% (31) [[Black (U.S. census)|Black or African American]], 0.02% (1) [[Native American (U.S. census)|Native American]], 26.41% (1,289) [[Asian (U.S. census)|Asian]], 0.00% (0) [[Pacific Islander (U.S. census)|Pacific Islander]], 0.74% (36) from [[Race and ethnicity in the United States census#Race|other races]], and 1.99% (97) from two or more races. [[Hispanic (U.S. census)|Hispanic or Latino]] of any race were 4.43% (216) of the population.<ref name=Census2010/> [[Korean American]]s accounted for 17.3% of the population.<ref name=Census2010/>

Of the 1,597 households, 45.1% had children under the age of 18; 76.8% were married couples living together; 8.4% had a female householder with no husband present and 12.1% were non-families. Of all households, 10.8% were made up of individuals and 7.0% had someone living alone who was 65 years of age or older. The average household size was 3.05 and the average family size was 3.29.<ref name=Census2010/> [[Domestic partnership|Same-sex couples]] headed eight households in 2010, an increase from the four counted in 2000.<ref>Lipman, Harvy; and Sheingold, Dave. [https://web.archive.org/web/20130203212228/http://www.northjersey.com/news/127675238_NORTH_JERSEY_SEES_30__GROWTH_IN_SAME-SEX_COUPLES___Census_shows_shift_in_suburbs.html "North Jersey sees 30% growth in same-sex couples"], ''[[The Record (North Jersey)|The Record]]'', August 14, 2011, backed up by the [[Internet Archive]] as of February 3, 2013. Accessed December 1, 2014.</ref>

27.5% of the population were under the age of 18, 6.2% from 18 to 24, 18.2% from 25 to 44, 33.6% from 45 to 64, and 14.4% who were 65 years of age or older. The median age was 43.9 years. For every 100 females, the population had 93.4 males. For every 100 females ages 18 and older there were 89.7 males.<ref name=Census2010/>

The Census Bureau's 2006–2010 [[American Community Survey]] showed that (in 2010 [[inflation adjustment|inflation-adjusted]] dollars) [[median household income]] was $147,714 (with a margin of error of +/− $14,743) and the median family income was $150,208 (+/− $9,154). Males had a median income of $101,085 (+/− $10,254) versus $58,295 (+/− $10,277) for females. The [[per capita income]] for the borough was $69,460 (+/− $10,589). About 1.4% of families and 1.2% of the population were below the [[poverty line]], including 1.2% of those under age 18 and none of those age 65 or over.<ref>[https://archive.today/20200212084621/http://factfinder.census.gov/bkmk/table/1.0/en/ACS/10_5YR/DP03/0600000US3400317530 DP03: Selected Economic Characteristics from the 2006-2010 American Community Survey 5-Year Estimates for Demarest borough, Bergen County, New Jersey], [[United States Census Bureau]]. Accessed May 17, 2012.</ref>