Blawenburg, New Jersey

Blawenburg is an unincorporated community and census-designated place (CDP) located within Montgomery Township, in Somerset County, in the U.S. state of New Jersey. As of the 2010 United States Census, the CDP's population was 280. It is located at the juncture of two large roads, CR 518 and CR 601.

History
The area that was eventually known as Blawenburg was settled by John Blaw prior to 1742 when he purchased 400 acres of farmland from Abraham Van Horn, a merchant of New York City and a large New Jersey landholder, and 95 acres adjacent to this tract from Nicholas Lake of New Brunswick. John's father was Jan Frederickse Blaw, a refugee from Holland, born in Recife, Pernambuco, Brazil, who settled in New Amsterdam where John Blaw was born. John had a son Michael who ran a mill at the point where the Great Road crosses Beden's Brook, and it is believed that Blaw's Mill was the origin of the name Blawenburg.

The Blawenburg Reformed Church was established here in 1832. The James Van Zandt Mansion was built 1860–1865.

Geography
According to the United States Census Bureau, Blawenburg had a total area of 0.612 square miles (1.586 km2), including 0.608 square miles (1.575 km2) of land and 0.004 square miles (0.011 km2) of water (0.69 percent).

2010 census
The 2010 United States census counted 280 people, 107 households, and 73 families in the CDP. The population density was 460.4 /sqmi. There were 115 housing units at an average density of 189.1 /sqmi. The racial makeup was 75.36% (211) White, 0.00% (0) Black or African American, 0.00% (0) Native American, 19.29% (54) Asian, 0.00% (0) Pacific Islander, 0.00% (0) from other races, and 5.36% (15) from two or more races. Hispanic or Latino of any race were 1.43% (4) of the population.

Of the 107 households, 31.8% had children under the age of 18; 61.7% were married couples living together; 4.7% had a female householder with no husband present and 31.8% were non-families. Of all households, 27.1% were made up of individuals and 9.3% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.23.

24.3% of the population were under the age of 18, 5.4% from 18 to 24, 20.4% from 25 to 44, 31.4% from 45 to 64, and 18.6% who were 65 years of age or older. The median age was 45.0 years. For every 100 females, the population had 87.9 males. For every 100 females ages 18 and older there were 87.6 males.

Historic district
The Blawenburg Historic District is a 336 acre historic district encompassing the community along Georgetown-Franklin Turnpike/County Route 518, Great Road/County Route 601, and Mountain View Road. It was added to the National Register of Historic Places on December 7, 1990, for its significance in agriculture, architecture, religion and exploration/settlement. The district includes 46 contributing buildings, two contributing structures and two contributing sites.

The Reformed Dutch Church of Blawenburg was added individually to the NRHP in 1985 and contributes to the district. The Blawenburg Tavern, also known as the William M. Griggs House, was built c. 1815. The village schoolhouse was built in 1853. The William Sherman House, built c. 1856, features Greek Revival and Italianate style. The 1860s James Van Zandt Mansion is a Victorian style Italian Villa.