2010 census

As of the census^[8] of 2010, there were 1,179 people, 555 households, and 366 families living in the town. The population density was 1,112.3 inhabitants per square mile (429.5/km²). There were 1,093 housing units at an average density of 1,031.1 per square mile (398.1/km²). The racial makeup of the town was 96.8% White, 1.4% African American, 0.3% Native American, 1.1% Asian, 0.2% from other races, and 0.2% from two or more races. Hispanic or Latino of any race were 0.6% of the population.

There were 555 households, of which 14.4% had children under the age of 18 living with them, 59.6% were married couples living together, 4.1% had a female householder with no husband present, 2.2% had a male householder with no wife present, and 34.1% were non-families. 30.6% of all households were made up of individuals, and 16.4% had someone living alone who was 65 years of age or older. The average household size was 2.12 and the average family size was 2.64.

The median age in the town was 58 years. 14.2% of residents were under the age of 18; 4.4% were between the ages of 18 and 24; 10% were from 25 to 44; 39.6% were from 45 to 64; and 32.1% were 65 years of age or older. The gender makeup of the town was 48.2% male and 51.8% female.

2000 census

As of the census^[3] of 2000, there were 1,559 people, 661 households, and 473 families living in the town. The population density was 1,495.7 inhabitants per square mile (577.5/km²). There were 1,071 housing units at an average density of 1,027.5 per square mile (396.7/km²). The racial makeup of the town was 97.69% White, 0.38% African American, 0.13% Native American, 1.03% Asian, and 0.77% from two or more races. Hispanic or Latino of any race were 0.71% of the population. The population of Long Beach boasts a large number of Irish Catholic descent.

There were 661 households, out of which 22.7% had children under the age of 18 living with them, 65.7% were married couples living together, 4.5% had a female householder with no husband present, and 28.3% were non-families. 25.6% of all households were made up of individuals, and 15.4% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.84.

In the town, the population was spread out, with 19.9% under the age of 18, 4.9% from 18 to 24, 14.2% from 25 to 44, 35.2% from 45 to 64, and 25.8% who were 65 years of age or older. The median age was 50 years. For every 100 females, there were 90.6 males. For every 100 females age 18 and over, there were 90.0 males.

The median income for a household in the town was $71,364, and the median income for a family was $84,532. Males had a median income of $71,563 versus $41,250 for females. The per capita income for the town was $43,159. None of the families and 0.9% of the population were living below the poverty line, including no under eighteens and none of those over 64.