Is Water Mill, NY growing?

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

Water Mill, NY had an estimated 2,764 (±556) residents in 2020–2024, against 1,631 in 2015–2019.

That is a change of +69.5%, a measurable increase.

Its housing went from 2,002 to 2,564 homes (+28.1%), a measurable increase.

1.8% of today’s homes were built in 2020 or later.

Figures last updated on November 12, 2026.

Residents now: 2,764 (±556)
Amount of change: +69.5%
Homes change: +28.1%
Built 2020 or later: 1.8%

Residents and homes in Water Mill, 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	1,631 (±489)	2,764 (±556)	+69.5%	Measurable increase
Housing units	2,002 (±242)	2,564 (±382)	+28.1%	Measurable increase
Households that rent	7.5% (±7.3 points)	6.3% (±5.6 points)	−1.2 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 Water Mill against Suffolk County, its state and the nation

Change between 2015–2019 and 2020–2024
	Residents	Verdict	Housing units
Water Mill	+69.5%	Measurable increase	+28.1%
Suffolk County	+3.1%	Measurable increase	+0.8%
New York	+1.4%	Measurable increase	+3.2%
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 Water Mill

Housing units by year built, 2020–2024
Year built	Water Mill	Suffolk County	New York	United States
2020 or later	1.8% (±1.6 points)	0.7%	0.8%	2.0%
2010 to 2019	12.3% (±6.7 points)	3.7%	5.3%	9.4%
2000 to 2009	20.4% (±6.8 points)	8.3%	6.4%	13.6%

14.1% of the homes in Water Mill were built in 2010 or later.

The median age of residents is 54.9 years.

Growth in places near Water Mill

Change in residents between 2015–2019 and 2020–2024
Place	Distance	Residents now	Amount of change	Verdict
Water Mill	—	2,764	+69.5%	Measurable increase
Bridgehampton	2.7 mi	1,531	+15.7%	Not a measurable change
North Sea	3.0 mi	6,458	+40.5%	Measurable increase
Noyack	3.9 mi	4,782	+9.4%	Not a measurable change
Village of Southampton	4.2 mi	4,621	+40.7%	Measurable increase
Village of Sagaponack	4.3 mi	303	+14.8%	Not a measurable change
Tuckahoe (community)	4.6 mi	1,249	+64.6%	Measurable increase
Shinnecock Reservation	5.4 mi	450	+2900.0%	Measurable increase
Shinnecock Hills	5.8 mi	2,545	+15.6%	Not a measurable change

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

It lies inside the Town of Southampton, 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 Water Mill

Is Water Mill growing?

Water Mill, NY had an estimated 2,764 residents in 2020–2024 and 1,631 in 2015–2019, a change of +69.5%: a measurable increase by the Census Bureau’s test.

How many homes have been added in Water Mill?

The estimated number of housing units went from 2,002 in 2015–2019 to 2,564 in 2020–2024 (+28.1%), a measurable increase.

How much new construction is there in Water Mill?

1.8% of homes in Water Mill were built in 2020 or later and 12.3% 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 Water Mill CDP, New York (place:78575, in state:36).

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.