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New Jersey Monthly magazine ranked Spring Lake as one of the best places to live in New Jersey in its 2010 rankings of the "Best Places To Live" in New Jersey.
The borough and its environs are known as the "Irish Riviera" because of the large Irish-American population in the area, with Spring Lake having the highest percentage of any municipality in the United States.
Spring Lake is home to the Spring Lake 5 Mile Run, a race that was first run in 1977, circling the borough, beginning and ending at the beachfront. The 1999 event drew 15,000 runners. In 2015, the race was listed as one of the top 100 races in America by Runner's World Magazine.
At the 2010 United States Census, there were 2,993 people, 1,253 households, and 829.5 families residing in the borough. The population density was 2,250.8 per square mile (869.0/km2). There were 2,048 housing units at an average density of 1,540.2 per square mile (594.7/km2). The racial makeup of the borough was 97.63% (2,922) White, 0.27% (8) Black or African American, 0.03% (1) Native American, 1.00% (30) Asian, 0.03% (1) Pacific Islander, 0.50% (15) from other races, and 0.53% (16) from two or more races. Hispanics or Latinos of any race were 1.90% (57) of the population.
There were 1,253 households, of which 22.6% had children under the age of 18 living with them, 56.8% were living together, 7.7% had a female householder with no husband present, and 33.8% were non-families. 31.3% of all households were made up of individuals, and 19.1% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 3.01.
In the borough, 21.6% of the population were under the age of 18, 5.6% from 18 to 24, 12.2% from 25 to 44, 33.2% from 45 to 64, and 27.4% who were 65 years of age or older. The median age was 51.9 years. For every 100 females there were 89.3 males. For every 100 females age 18 and over, there were 83.9 males.
The Census Bureau's 2006-2010 American Community Survey showed that (in 2010 inflation-adjusted dollars) median household income was $97,885 (with a margin of error of +/- $16,792) and the median family income was $150,156 (+/- $39,466). Males had a median income of $106,853 (+/- $30,491) versus $68,750 (+/- $15,695) for females. The per capita income for the borough was $71,661 (+/- $14,582). About 2.2% of families and 2.8% of the population were below the poverty line, including 0.0% of those under age 18 and 2.0% of those age 65 or over.