Spencer Flag

Spencer

County:
Clay County
County Seat:
Yes
Area (mi²):
10.948
State:
Iowa

Spencer is a city located in Clay County, Iowa. Spencer has a 2026 population of 11,475. It is also the county seat of Clay County. Spencer is currently growing at a rate of 0.25% annually and its population has increased by 1.51% since the most recent census, which recorded a population of 11,304 in 2020.

The median household income in Spencer is $59,667 with a poverty rate of 14.02%. The median age in Spencer is 41.4 years: 39 years for males, and 43.1 years for females. For every 100 females there are 93.0 males.

11.5K
Total Population
1,048
Density (mi²)
29 0.25%
Growth

Spencer Population

Spencer Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202611,475290.25%
202511,446280.25%
202411,418-46-0.4%
202311,464240.21%
202211,440390.34%
202111,401970.86%
202011,304-18-0.16%
201911,016-42-0.38%
201811,058170.15%
201711,041-57-0.51%
201611,098-99-0.88%
201511,197170.15%
201411,180490.44%
201311,131-34-0.3%
201211,165-39-0.35%
201111,204-21-0.19%
201011,225-8-0.07%
200011,3172512.27%
199011,066-660-5.63%
198011,7261,44814.09%
197010,2781,41415.95%
19608,8641,41819.04%
19507,44684712.84%
19406,5991,58031.48%
19305,0194209.13%
19204,5991,59453.04%
19103,005-90-2.91%
19003,09500%

Median Age

Overall: 41.4 years
Female: 43.1 years
Male: 39 years

Spencer Adults

There are 8,743 adults, (2,495 of whom are seniors) in Spencer.

Sex Ratio

Female: 5,906 (51.8%)
Male: 5,494 (48.2%)

Demographics

The racial composition of Spencer includes 92.25% White, and smaller percentages for other race, Asian, Black or African American, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White10,51692.25%
Two or more races4233.71%
Other race2982.61%
Asian1030.9%
Black or African American400.35%
Native American200.18%
Race
Population ↓
Percentage (of total)
Other race2982.61%
White2111.85%
Two or more races1351.18%
Race
Population ↓
Percentage (of total)
White10,30590.39%
Two or more races2882.53%
Asian1030.9%
Black or African American400.35%
Native American200.18%

Spencer Marital Status

Economics and Income Statistics

Spencer 's average per capita income is $46,288. Household income levels show a median of $59,667. The poverty rate stands at 14.02%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median ↓
Mean
Married Families$103,902-
Families$82,439$104,659
Households$59,667$78,061
Non Families$36,073$46,160

$46,288

Average Income

$59,667

Median Household Income

14.02%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)