Boulder Flag

Boulder

County:
Linn County
County Seat:
No
Area (mi²):
35.954
State:
Iowa

Boulder is located in Linn County, Iowa. Boulder has a 2025 population of 379 . Boulder is currently declining at a rate of 0% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.

The average household income in Boulder is $105,598 with a poverty rate of 9.81%. The median age in Boulder is 36.8 years: 39.3 years for males, and 36.4 years for females. For every 100 females there are 100.5 males.

379
Total Population
11
Density (mi²)

Boulder Population

Boulder Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Boulder includes 96.04% White, and smaller percentages for Native American and multiracial populations.

Population by Race

White (96.04%)

Two or more races (3.69%)

Native American (0.26%)

Race
Population
Percentage (of total)
White36496.04%
Two or more races143.69%
Native American10.26%

Boulder Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Boulder's average per capita income is $53,571. Household income levels show a median of $105,125. The poverty rate stands at 9.81%.

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$115,278-
Families$107,250$107,963
Households$105,125$105,598
Non Families$38,958$80,865

$53,571

Average Income

$105,125

Median Household Income

9.81%

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)