Spearfish Population

1880–2026

14,541

2026 projection

18.8% since 2020 (increase)

05K10K15K20K18801900192019401960198020002020

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 Spearfish. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202614,541+3872.73%
202514,154+3652.65%
202413,789+4783.59%
202313,311+3672.84%
202212,944+5584.51%
202112,386+1471.20%
202012,239+4473.79%
201911,792+960.82%
201811,696+170.15%
201711,679+2021.76%

Showing 10 of 30 years.

Spearfish Demographics

40median age

Median age

Female39.4 yrs
Male40.2 yrs

Adults

10,554
2,676 seniors · 25%7,878 other adults

Sex

Female 51.9% · 6,706Male 48.1% · 6,224

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 129 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

Spearfish Income

$65,688median household income

Median household income

$65,688

Half of households earn more, half earn less

Median earnings

$45,877

Typical yearly pay for a worker 25 or older.

Poverty rate

15.2%

About 1 in 7 residents

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

Spearfish Marital Status

42% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married42%44%41%
Never married37%39%35%
Divorced14%13%14%
Widowed6%2%9%
Separated2%1%2%

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