Is Blackwells Mills, NJ growing?

Name: Growth in Blackwells Mills, NJ, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

Blackwells Mills, NJ had an estimated 10,301 (±972) residents in 2020–2024, against 684 in 2015–2019.

That is a change of +1406.0%, a measurable increase.

Its housing went from 212 to 3,078 homes (+1351.9%), a measurable increase.

0.6% of today’s homes were built in 2020 or later.

Figures last updated on November 12, 2026.

Residents now: 10,301 (±972)
Amount of change: +1406.0%
Homes change: +1351.9%
Built 2020 or later: 0.6%

Residents and homes in Blackwells Mills, 2015–2019 and 2020–2024

2015–2019 and 2020–2024 American Community Survey 5-year estimates
	2015–2019	2020–2024	Amount of change	Verdict
Residents	684 (±296)	10,301 (±972)	+1406.0%	Measurable increase
Housing units	212 (±95)	3,078 (±257)	+1351.9%	Measurable increase
Households that rent	5.2% (±10.2 points)	4.9% (±3.6 points)	−0.3 percentage points	Not a measurable change

The Census Bureau publishes 2015–2019 dollars in 2019 dollars and 2020–2024 dollars in 2024 dollars.

Prices (the CPI-U, US Bureau of Labor Statistics) rose 22.7% between 2019 and 2024, so a dollar figure’s verdict compares the two after raising the earlier one by that much, using the Census Bureau’s test for a difference.

The two periods do not overlap, as the Census Bureau recommends for 5-year estimates.

Growth in Blackwells Mills against Somerset County, its state and the nation

Change between 2015–2019 and 2020–2024
	Residents	Verdict	Housing units
Blackwells Mills	+1406.0%	Measurable increase	+1351.9%
Somerset County	+6.1%	Measurable increase	+5.5%
New Jersey	+5.2%	Measurable increase	+4.8%
United States	+3.1%	Measurable increase	+4.6%

A change in a place’s boundaries between the two periods (an annexation, say) changes its counts as well; the Census Bureau’s figures are for the place as it was drawn in each period.

New homes in Blackwells Mills

Housing units by year built, 2020–2024
Year built	Blackwells Mills	Somerset County	New Jersey	United States
2020 or later	0.6% (±1.0 points)	1.3%	1.1%	2.0%
2010 to 2019	6.5% (±3.1 points)	6.1%	6.2%	9.4%
2000 to 2009	10.9% (±4.5 points)	9.7%	9.2%	13.6%

7.1% of the homes in Blackwells Mills were built in 2010 or later.

The median age of residents is 40.2 years.

Growth in places near Blackwells Mills

Change in residents between 2015–2019 and 2020–2024
Place	Distance	Residents now	Amount of change	Verdict
Blackwells Mills	—	10,301	+1406.0%	Measurable increase
Millstone Borough	1.3 mi	655	+31.5%	Not a measurable change
Franklin Township (Somerset County)	2.5 mi	68,907	+5.1%	Measurable increase
Weston	3.1 mi	2,105	+18.1%	Not a measurable change
Belle Mead	3.2 mi	6,394	+3049.8%	Measurable increase
Six Mile Run	3.5 mi	2,882	−0.6%	Not a measurable change
Middlebush	3.6 mi	2,049	−22.6%	Not a measurable change
Franklin Park	3.9 mi	13,211	−5.5%	Not a measurable change
Ten Mile Run	4.0 mi	2,492	+75.1%	Measurable increase

Blackwells Mills is a census-designated place: an unincorporated community the Census Bureau draws for statistics, with no municipal government of its own.

It lies inside Hillsborough Township, whose figures include it.

Survey years: 2020–2024 (American Community Survey 5-year estimates), compared with 2015–2019.

Margins of error are at the 90% confidence level.

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Questions about Blackwells Mills

Is Blackwells Mills growing?

Blackwells Mills, NJ had an estimated 10,301 residents in 2020–2024 and 684 in 2015–2019, a change of +1406.0%: a measurable increase by the Census Bureau’s test.

How many homes have been added in Blackwells Mills?

The estimated number of housing units went from 212 in 2015–2019 to 3,078 in 2020–2024 (+1351.9%), a measurable increase.

How much new construction is there in Blackwells Mills?

0.6% of homes in Blackwells Mills were built in 2020 or later and 6.5% between 2010 and 2019.

Sources

To check these figures in the Census Bureau’s own API, request the variables below from the 2024 ACS 5-year data profile (acs/acs5/profile) for Blackwells Mills CDP, New Jersey (place:06025, in state:34).

Each estimate (E or PE) has a margin of error beside it (M or PM).

The 2015–2019 figures are B01003_001E, B01003_001M, B25001_001E, B25001_001M, DP04_0047PE, DP04_0047PM, B25064_001E, B25064_001M, B25077_001E, B25077_001M from the 2019 release.

The API needs a free key.

Request a Census API key.

DP05_0001E, DP05_0001M, DP04_0001E, DP04_0001M, DP04_0017PE, DP04_0017PM, DP04_0018PE, DP04_0018PM, DP05_0018E, DP05_0018M

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Figures are published by the US Census Bureau, HUD, the Bureau of Labor Statistics and the FBI; Seayora reproduces them and does not adjust them, except where a sentence says it compares dollar figures after inflation. They describe the whole place, not any one building or street, and are not an appraisal, a rent determination, a tax bill, a safety rating or legal advice.