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 from the 2,665 counted in the 2000 Census, which had in turn increased by 366 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, 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.