Pennington County Population

1910–2026

13,622

2026 projection

2.3% since 2020 (decrease)

05K10K15K20K192019401960198020002020

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 Pennington County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202613,622-640.47%
202513,686-640.47%
202413,750+160.12%
202313,734-920.67%
202213,826+400.29%
202113,786-1561.12%
202013,942-1270.90%
201914,069-1060.75%
201814,175-170.12%
201714,192-500.35%

Showing 10 of 26 years.

Pennington County Demographics

39.6median age

Median age

Female40.7 yrs
Male38.7 yrs

Adults

10,925
2,665 seniors (65+) · 24% of adults8,260 other adults

Sex

Female 50.1% · 6,905Male 49.9% · 6,886

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 138 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

Pennington County Income

$77,325median household income

Median household income

$77,325

Half of households earn more, half earn less

Median earnings

$50,765

Typical yearly pay for a worker 25 or older.

Poverty rate

10.5%

About 1 in 10 residents

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

Pennington County Marital Status

51% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married51%52%51%
Never married30%35%25%
Divorced11%9%13%
Widowed7%4%11%
Separated<1%<1%<1%

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