Hillenburg is a German surname. It may have originated as a variant spelling of Hallenberg, a habitational surname referring to Hallenberg, North Rhine-Westphalia, Germany. Variant spellings of the surname include Hellenberg. The 2010 United States census found 555 people with the surname Hillenburg, making it the 39,607th-most-common name in the country. This represented an increase from 519 people (39,824th-most-common) in the 2000 United States census. In both censuses, roughly 95% of the bearers of the surname identified as non-Hispanic white, and 2.3% as Hispanic or Latino of any race.

In 1940, Laborer and House Keeper were the top reported jobs for men and women in the USA named Hillenburg, where 47% of Hillenburg men were Laborer's and 46% of Hillenburg women were House Keepers.

Notable people with the surname include:

Andy Hillenburg (born 1963), American racecar driver Dustin Hillenburg (born 2001), American racecar driver, son of Andy Rolf Kalmuczak (1938–2007), German crime novelist who sometimes used the pen name Martin Hillenburg Stephen Hillenburg (1961–2018), American animator who created the SpongeBob SquarePants series

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