Seneca County Population

1830–2026

54,350

2026 projection

1.3% since 2020 (decrease)

010K20K30K40K50K60K70K1850190019502000

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 Seneca County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202654,350-1720.32%
202554,522-1720.31%
202454,694-250.05%
202354,719+690.13%
202254,650-3250.59%
202154,975-860.16%
202055,061-1590.29%
201955,220-360.07%
201855,256-660.12%
201755,322-1950.35%

Showing 10 of 34 years.

Seneca County Demographics

40.2median age

Median age

Female41.4 yrs
Male38.8 yrs

Adults

43,042
10,538 seniors (65+) · 24% of adults32,504 other adults

Sex

Female 49.8% · 27,286Male 50.2% · 27,484

Population by age

MaleFemale85+ years, male: 33385+ years, female: 71480–84 years, male: 63980–84 years, female: 73375–79 years, male: 77375–79 years, female: 91670–74 years, male: 1,38570–74 years, female: 1,44765–69 years, male: 1,77465–69 years, female: 1,82460–64 years, male: 1,60660–64 years, female: 1,87355–59 years, male: 2,02955–59 years, female: 1,84750–54 years, male: 1,64250–54 years, female: 1,63645–49 years, male: 1,55645–49 years, female: 1,56940–44 years, male: 1,61440–44 years, female: 1,60735–39 years, male: 1,61835–39 years, female: 1,42730–34 years, male: 1,67930–34 years, female: 1,48325–29 years, male: 1,81825–29 years, female: 1,61520–24 years, male: 1,95020–24 years, female: 1,89715–19 years, male: 2,18115–19 years, female: 2,09410–14 years, male: 1,76810–14 years, female: 1,6725–9 years, male: 1,5955–9 years, female: 1,4760–4 years, male: 1,5240–4 years, female: 1,45685+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–41K1K2K2K

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 548 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

Seneca County Income

$66,025median household income

Median household income

$66,025

Half of households earn more, half earn less

Median earnings

$45,760

Typical yearly pay for a worker 25 or older.

Poverty rate

11.9%

About 1 in 8 residents

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

Seneca County Marital Status

48% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married48%48%47%
Never married33%38%28%
Divorced12%10%14%
Widowed6%3%9%
Separated2%2%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