Suffolk County Population

1790–2026

1.55M

2026 projection

1.8% since 2020 (increase)

00.5M1M1.5M2M18001850190019502000

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.
20261,548,850+2,7600.18%
20251,546,090+2,7600.18%
20241,543,330+10,1570.66%
20231,533,173+1,4370.09%
20221,531,736-2,0060.13%
20211,533,742+11,7780.77%
20201,521,964+43,6392.95%
20191,478,325-3,9500.27%
20181,482,275-1,5870.11%
20171,483,862-2,8370.19%

Showing 10 of 38 years.

Suffolk County Demographics

41.7median age

Median age

Female43.1 yrs
Male40.4 yrs

Adults

1,212,247
274,038 seniors (65+) · 23% of adults938,209 other adults

Sex

Female 50.4% · 771,191Male 49.6% · 758,955

Population by age

MaleFemale85+ years, male: 12,13385+ years, female: 22,03280–84 years, male: 13,13880–84 years, female: 18,09175–79 years, male: 22,56075–79 years, female: 28,61170–74 years, male: 33,94770–74 years, female: 38,54065–69 years, male: 40,96465–69 years, female: 44,02260–64 years, male: 53,73260–64 years, female: 55,92355–59 years, male: 59,62455–59 years, female: 59,02150–54 years, male: 54,02750–54 years, female: 54,30145–49 years, male: 47,40645–49 years, female: 47,00440–44 years, male: 46,27640–44 years, female: 45,53735–39 years, male: 47,13735–39 years, female: 44,63530–34 years, male: 47,40430–34 years, female: 45,04725–29 years, male: 48,27225–29 years, female: 46,26520–24 years, male: 49,71020–24 years, female: 47,66215–19 years, male: 50,97415–19 years, female: 47,95010–14 years, male: 48,43310–14 years, female: 46,1995–9 years, male: 41,9445–9 years, female: 40,5160–4 years, male: 41,2740–4 years, female: 39,83585+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 15,301 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

$130,686median household income

Median household income

$130,686

Half of households earn more, half earn less

Median earnings

$66,805

Typical yearly pay for a worker 25 or older.

Poverty rate

6.4%

About 1 in 16 residents

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

Suffolk County Marital Status

50% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married50%52%48%
Never married34%37%31%
Divorced9%7%10%
Widowed6%3%9%
Separated1%1%2%

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