Lavallette is a borough in Ocean County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 1,875, reflecting a decline of 790 (-29.6%) from the 2,665 counted in the 2000 Census, which had in turn increased by 366 (+15.9%) from the 2,299 counted in the 1990 Census. Lavallette is situated on the Barnegat Peninsula, a long, narrow barrier peninsula that separates Barnegat Bay from the Atlantic Ocean.
Lavallette was incorporated as a borough by an act of the New Jersey Legislature on December 21, 1887, from portions of Dover Township (now Toms River Township), based on the results of a referendum held two days earlier.
Lavallette was named for Elie A. F. La Vallette, one of the first rear admirals appointed in the United States Navy when President Abraham Lincoln created the rank in July 1862, and the father of Albert T. Lavallette, co-founder of the borough.
New Jersey Monthly magazine ranked Lavallette as its 8th best place to live in its 2008 rankings of the "Best Places To Live" in New Jersey.
According to the United States Census Bureau, the borough had a total area of 0.954 square miles (2.473 km2), including 0.808 square miles (2.094 km2) of land and 0.146 square miles (0.379 km2) of water (15.32%).
The borough borders the Ocean County municipality of Toms River Township.
The 2010 United States Census counted 1,875 people, 945 households, and 556.605 families in the borough. The population density was 2,319.2 per square mile (895.4/km2). There were 3,207 housing units at an average density of 3,966.8 per square mile (1,531.6/km2). The racial makeup was 97.87% (1,835) White, 0.11% (2) Black or African American, 0.00% (0) Native American, 0.53% (10) Asian, 0.00% (0) Pacific Islander, 1.01% (19) from other races, and 0.48% (9) from two or more races. Hispanic or Latino of any race were 2.99% (56) of the population.
Of the 945 households, 11.4% had children under the age of 18; 47.8% were married couples living together; 9.0% had a female householder with no husband present and 41.1% were non-families. Of all households, 36.7% were made up of individuals and 21.9% had someone living alone who was 65 years of age or older. The average household size was 1.98 and the average family size was 2.57.
11.0% of the population were under the age of 18, 5.0% from 18 to 24, 13.1% from 25 to 44, 30.6% from 45 to 64, and 40.4% who were 65 years of age or older.