Suffolk County Population

1790–2026

790.25K

2026 projection

0.1% since 2020 (decrease)

0200K400K600K800K1M18001850190019502000

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for Suffolk County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026790,247-1,6440.21%
2025791,891-1,6440.21%
2024793,535+8,8981.13%
2023784,637+6,5470.84%
2022778,090+4900.06%
2021777,600-13,7721.74%
2020791,372-14,5431.80%
2019805,915+1,8920.24%
2018804,023+2,7540.34%
2017801,269+8,2491.04%

Showing 10 of 38 years.

Suffolk County Demographics

33.9median age

Median age

Female34.2 yrs
Male33.6 yrs

Adults

659,309
104,159 seniors (65+) · 16% of adults555,150 other adults

Sex

Female 51.8% · 406,361Male 48.2% · 378,760

Population by age

MaleFemale85+ years, male: 4,68185+ years, female: 8,65680–84 years, male: 4,47880–84 years, female: 7,13975–79 years, male: 7,57875–79 years, female: 10,26270–74 years, male: 12,03970–74 years, female: 15,75865–69 years, male: 15,85365–69 years, female: 17,71560–64 years, male: 19,10360–64 years, female: 20,65655–59 years, male: 21,11255–59 years, female: 22,00650–54 years, male: 20,34050–54 years, female: 21,33945–49 years, male: 19,94545–49 years, female: 20,74840–44 years, male: 23,42940–44 years, female: 23,25535–39 years, male: 30,70735–39 years, female: 30,55030–34 years, male: 41,96330–34 years, female: 41,54025–29 years, male: 44,43225–29 years, female: 46,81720–24 years, male: 33,58720–24 years, female: 38,54715–19 years, male: 26,64915–19 years, female: 29,52710–14 years, male: 17,09010–14 years, female: 18,2025–9 years, male: 16,6915–9 years, female: 14,8420–4 years, male: 19,0830–4 years, female: 18,80285+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–420K20K40K40K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 7,851 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Suffolk County Income

$95,631median household income

Median household income

$95,631

Half of households earn more, half earn less

Median earnings

$66,348

Typical yearly pay for a worker 25 or older.

Poverty rate

16.2%

About 1 in 6 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Suffolk County Marital Status

32% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married32%35%29%
Never married54%55%53%
Divorced8%7%9%
Widowed4%2%6%
Separated2%2%3%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year