| Blackwells Mills, New Jersey | |
| Settlement Type: | Census-designated place |
| Pushpin Map: | USA New Jersey Somerset County#USA New Jersey#USA |
| Pushpin Label: | Blackwells Mills |
| Pushpin Map Caption: | Location in Somerset County##Location in New Jersey##Location in the United States |
| Pushpin Relief: | yes |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Somerset |
| Subdivision Type3: | Township |
| Subdivision Name3: | Franklin |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 20.21 |
| Area Land Km2: | 19.89 |
| Area Water Km2: | 0.32 |
| Area Total Sq Mi: | 7.80 |
| Area Land Sq Mi: | 7.68 |
| Area Water Sq Mi: | 0.12 |
| Area Water Percent: | 5.70 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 9473 |
| Population Density Km2: | 476.24 |
| Population Density Sq Mi: | 1233.46 |
| Timezone: | Eastern (EST) |
| Utc Offset: | −05:00 |
| Timezone Dst: | Eastern (EDT) |
| Utc Offset Dst: | −04:00 |
| Elevation Footnotes: | [3] |
| Elevation M: | 27 |
| Elevation Ft: | 89 |
| Coordinates Footnotes: | [4] [5] |
| Coordinates: | 40.4836°N -74.5678°W |
| Area Codes: | 609/640 and 732/848 |
| Blank Name: | FIPS code |
| Blank Info: | [6] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 02583968 |
Blackwells Mills is an unincorporated community and census-designated place (CDP)[7] located in Franklin Township in Somerset County, in the U.S. state of New Jersey.[8] [9] [10] As of the 2010 U.S. census, the CDP's population was 803.[11]
Blackwells Mills is on the east side of the Millstone River in Franklin Township, Somerset County, New Jersey. A mill was built in 1746 by Peter Schenk. His daughter married a Mercer and the mill passed to her family. The mill was purchased by William Blackwell in 1804 with his uncle Capt. Jacob Blackwell. These men were from nearby Hopewell Township. William Blackwell built a fine Federal period house on the land across the road on the Hillsborough side. Following Hurricane Floyd, the house was moved westward to higher ground. It is still standing. Following the death of William Blackwell in the 1850s, his son John came into possession of the mill. John Blackwell died early in life, and his widow sold the mill to Augustus VanZant in 1872. On May 31, 1771 the west bank of the Millstone River became Hillsborough Township.
The mill burned down in 1885 and was rebuilt. A major restoration was done in 1943.[12]
According to the U.S. Census Bureau, Blackwells Mills had a total area of 1.296 square miles (3.356 km2), including 1.222 square miles (3.165 km2) of land and 0.074 square miles (0.191 km2) of water (5.70%).[4]
The 2010 United States census counted 803 people, 238 households, and 218 families in the CDP. The population density was . There were 241 housing units at an average density of . The racial makeup was 69.12% (555) White, 10.96% (88) Black or African American, 0.12% (1) Native American, 17.93% (144) Asian, 0.37% (3) Pacific Islander, 0.00% (0) from other races, and 1.49% (12) from two or more races. Hispanic or Latino of any race were 4.48% (36) of the population.[11]
Of the 238 households, 61.3% had children under the age of 18; 85.7% were married couples living together; 4.6% had a female householder with no husband present and 8.4% were non-families. Of all households, 3.8% were made up of individuals and 0.4% had someone living alone who was 65 years of age or older. The average household size was 3.34 and the average family size was 3.43.[11]
32.6% of the population were under the age of 18, 5.6% from 18 to 24, 23.0% from 25 to 44, 34.4% from 45 to 64, and 4.4% who were 65 years of age or older. The median age was 40.9 years. For every 100 females, the population had 94.9 males. For every 100 females ages 18 and older there were 96.0 males.[11]
The Blackwells Mills Canal House, located at Blackwells Mills Road and Canal Road along the Delaware and Raritan Canal, was built, at the same time as the canal. It was constructed to house the bridge tender, who would open the swing bridge when canal boats came through, then close it to allow traffic to cross over the canal. It is a contributing property of the Delaware and Raritan Canal historic district, added to the National Register of Historic Places on May 11, 1973.[13]