Spencer County Population

1820–2026

19,965

2026 projection

0.7% since 2020 (increase)

05K10K15K20K25K1850190019502000

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 Spencer County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202619,965-960.48%
202520,061-960.48%
202420,157+1430.71%
202320,014+1280.64%
202219,886+310.16%
202119,855+240.12%
202019,831-4422.18%
201920,273-1120.55%
201820,385-560.27%
201720,441-550.27%

Showing 10 of 35 years.

Spencer County Demographics

44.4median age

Median age

Female44.9 yrs
Male43.8 yrs

Adults

15,642
4,116 seniors (65+) · 26% of adults11,526 other adults

Sex

Female 48.5% · 9,687Male 51.5% · 10,268

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 200 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

Spencer County Income

$74,506median household income

Median household income

$74,506

Half of households earn more, half earn less

Median earnings

$49,486

Typical yearly pay for a worker 25 or older.

Poverty rate

7.5%

About 1 in 13 residents

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

Spencer County Marital Status

58% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married58%59%58%
Never married24%27%21%
Divorced10%9%12%
Widowed6%4%9%
Separated1%1%<1%

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