Port Jefferson, New York demographics

Port Jefferson, NY demographics: median age 45.0; 67.7% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Port Jefferson village, New York · Incorporated village · GEOID 3659355. The survey estimates a population of 8,091 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Port Jefferson is 45.0 years, with a 90% margin of error of 2.8 years. There are 3,262 households (±245). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	45.0 ±2.8	39.8 ±0.1	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 8,091
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
Under 18	1,446 ±301	17.9% ±3.7 pp	20.5%	22.0%
18–34	1,666 ±315	20.6% ±3.9 pp	23.1%	22.8%
35–64	3,080 ±356	38.1% ±4.4 pp	38.5%	38.0%
65 and older	1,899 ±327	23.5% ±4.0 pp	17.9%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 8,091
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
Male	3,870 ±303	47.8% ±3.7 pp	48.8%	49.5%
Female	4,221 ±304	52.2% ±3.7 pp	51.2%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 8,091
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
White alone	6,586 ±388	81.4% ±4.8 pp	55.2%	61.0%
Black or African American alone	31 ±30 · low precision	0.4% ±0.4 pp · low precision	14.4%	12.2%
American Indian and Alaska Native alone	19 ±23 · low precision	0.2% ±0.3 pp · low precision	0.6%	0.9%
Asian alone	516 ±219	6.4% ±2.7 pp	9.1%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±19 · low precision	0.0% ±0.2 pp · low precision	0.0%	0.2%
Some other race alone	328 ±257 · low precision	4.1% ±3.2 pp · low precision	10.4%	7.1%
Two or more races	611 ±193	7.6% ±2.4 pp	10.3%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 8,091
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
Not Hispanic or Latino	7,240 ±344	89.5% ±4.2 pp	80.2%	80.7%
Hispanic or Latino	851 ±342	10.5% ±4.2 pp	19.8%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 3,262
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
Married-couple family	1,552 ±183	47.6% ±4.3 pp	42.5%	46.9%
Other family: male householder, no spouse present	113 ±68 · low precision	3.5% ±2.1 pp · low precision	5.2%	5.1%
Other family: female householder, no spouse present	254 ±95	7.8% ±2.9 pp	13.7%	12.2%
Nonfamily: householder living alone	1,043 ±279	32.0% ±8.2 pp	31.1%	28.7%
Nonfamily: householder not living alone	300 ±110	9.2% ±3.3 pp	7.6%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 3,262
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
Households with people under 18	737 ±104	22.6% ±2.7 pp	27.3%	29.5%
Households without people under 18	2,525 ±280	77.4% ±6.3 pp	72.7%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 3,262
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
One-person nonfamily households	1,043 ±279	32.0% ±8.2 pp	31.1%	28.7%
Two-person households	1,071 ±204	32.8% ±5.8 pp	31.5%	33.8%
Three-person households	588 ±145	18.0% ±4.2 pp	15.5%	15.3%
Four-person households	246 ±85	7.5% ±2.5 pp	12.4%	12.6%
Five-person households	179 ±90 · low precision	5.5% ±2.7 pp	5.6%	5.9%
Six-person households	120 ±86 · low precision	3.7% ±2.6 pp · low precision	2.2%	2.2%
Seven or more people	15 ±25 · low precision	0.5% ±0.8 pp · low precision	1.7%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 8,091
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
Native	6,719 ±326	83.0% ±4.0 pp	77.2%	85.9%
Foreign born	1,372 ±323	17.0% ±4.0 pp	22.8%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 7,751
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
English only	6,289 ±434	81.1% ±5.3 pp	69.1%	77.7%
Spanish	612 ±305	7.9% ±3.9 pp	14.8%	13.6%
French, Haitian, or Cajun	31 ±25 · low precision	0.4% ±0.3 pp · low precision	1.5%	0.7%
German or other West Germanic	100 ±127 · low precision	1.3% ±1.6 pp · low precision	1.5%	0.5%
Russian, Polish, or other Slavic	179 ±119 · low precision	2.3% ±1.5 pp · low precision	2.0%	0.7%
Other Indo-European	140 ±89 · low precision	1.8% ±1.1 pp · low precision	4.0%	2.0%
Korean	51 ±52 · low precision	0.7% ±0.7 pp · low precision	0.5%	0.3%
Chinese, including Mandarin and Cantonese	140 ±97 · low precision	1.8% ±1.3 pp · low precision	3.2%	1.1%
Vietnamese	9 ±14 · low precision	0.1% ±0.2 pp · low precision	0.1%	0.5%
Tagalog, including Filipino	0 ±19 · low precision	0.0% ±0.2 pp · low precision	0.4%	0.6%
Other Asian and Pacific Island	146 ±86 · low precision	1.9% ±1.1 pp · low precision	0.9%	1.1%
Arabic	45 ±48 · low precision	0.6% ±0.6 pp · low precision	0.7%	0.5%
Other and unspecified	9 ±15 · low precision	0.1% ±0.2 pp · low precision	1.3%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 5,926
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
Less than high school graduate	154 ±93 · low precision	2.6% ±1.6 pp · low precision	12.0%	10.4%
High school graduate or equivalency	829 ±246	14.0% ±4.1 pp	24.3%	26.0%
Some college, no degree	585 ±162	9.9% ±2.7 pp	14.6%	19.1%
Associate’s degree	344 ±121	5.8% ±2.0 pp	8.8%	8.8%
Bachelor’s degree	1,567 ±314	26.4% ±5.2 pp	22.4%	21.6%
Graduate or professional degree	2,447 ±365	41.3% ±5.9 pp	17.9%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 7,990
Category	Count ± MOE	Share ± MOE (pp)	New York	U.S.
Same house	7,269 ±237	91.0% ±2.8 pp	90.1%	87.7%
Moved within same county	464 ±197	5.8% ±2.5 pp	5.1%	6.3%
Moved from a different county in the same state	143 ±128 · low precision	1.8% ±1.6 pp · low precision	2.6%	3.1%
Moved from a different state	91 ±55 · low precision	1.1% ±0.7 pp · low precision	1.5%	2.3%
Moved from abroad	23 ±26 · low precision	0.3% ±0.3 pp · low precision	0.7%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

3.3% of Port Jefferson residents (±2.2 percentage points) had no health insurance coverage when surveyed, compared with 5.1% in New York and 8.4% nationally. 96.3% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Port Jefferson	New York	U.S.	Compared with New York
People without health insurance Civilian noninstitutionalized population	3.3% ±2.2 pp · low precision	5.1%	8.4%	Not statistically different
Households with a broadband subscription Households	96.3% ±9.9 pp	90.8%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	3.2% ±1.1 pp	3.7%	6.2%	Not statistically different

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Port Jefferson . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Port Jefferson housing and cost context or return to the city profile.