Seneca County Population

1810–2026

33,095

2026 projection

1% since 2020 (decrease)

010K20K30K40K1850190019502000

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.
202633,095+2120.64%
202532,883+2120.65%
202432,671+2220.68%
202332,449-2270.69%
202232,676-5611.69%
202133,237-2080.62%
202033,445-7442.18%
201934,189-880.26%
201834,277-160.05%
201734,293-4321.24%

Showing 10 of 36 years.

Seneca County Demographics

43median age

Median age

Female45 yrs
Male41.3 yrs

Adults

26,238
7,104 seniors (65+) · 27% of adults19,134 other adults

Sex

Female 48.4% · 15,918Male 51.6% · 17,002

Population by age

MaleFemale85+ years, male: 44185+ years, female: 52680–84 years, male: 24980–84 years, female: 37375–79 years, male: 59275–79 years, female: 64370–74 years, male: 84870–74 years, female: 95865–69 years, male: 1,26765–69 years, female: 1,20760–64 years, male: 1,31760–64 years, female: 1,31655–59 years, male: 1,06355–59 years, female: 1,05150–54 years, male: 1,05550–54 years, female: 1,03245–49 years, male: 94645–49 years, female: 84540–44 years, male: 94940–44 years, female: 93135–39 years, male: 1,21135–39 years, female: 85530–34 years, male: 1,21630–34 years, female: 92525–29 years, male: 99125–29 years, female: 93520–24 years, male: 99520–24 years, female: 83515–19 years, male: 96615–19 years, female: 82110–14 years, male: 1,18710–14 years, female: 9375–9 years, male: 8345–9 years, female: 8940–4 years, male: 8750–4 years, female: 83485+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45005001K1K

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 329 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

$68,089median household income

Median household income

$68,089

Half of households earn more, half earn less

Median earnings

$48,280

Typical yearly pay for a worker 25 or older.

Poverty rate

13.5%

About 1 in 7 residents

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

Seneca County Marital Status

45% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married45%45%45%
Never married33%38%28%
Divorced12%10%14%
Widowed8%4%11%
Separated2%3%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