Waterloo Flag

Waterloo

County Seat:
No
Area (mi²):
5.435
State:
California

Waterloo is a CDP located in San Joaquin County, California. Waterloo has a 2026 population of 958. Waterloo is currently growing at a rate of 2.57% annually and its population has decreased by 0% since the most recent census, which recorded a population of 0 in 2020.

The median household income in Waterloo is $221,850 with a poverty rate of 5.48%. The median age in Waterloo is 40.5 years: 55.2 years for males, and 34.8 years for females. For every 100 females there are 99.1 males.

958
Total Population
176
Density (mi²)
24 2.57%
Growth

Waterloo Population

Waterloo Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
2026958242.57%
2025934242.64%

Median Age

Overall: 40.5 years
Female: 34.8 years
Male: 55.2 years

Waterloo Adults

There are 786 adults, (104 of whom are seniors) in Waterloo.

Sex Ratio

Female: 449 (50.2%)
Male: 445 (49.8%)

Demographics

The racial composition of Waterloo includes 88.7% White, 3.24% other race, and smaller percentages for and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White79388.7%
Two or more races728.05%
Other race293.24%
Race
Population ↓
Percentage (of total)
Two or more races697.72%
Other race293.24%
Race
Population ↓
Percentage (of total)
White79388.7%
Two or more races30.34%

Waterloo Marital Status

Economics and Income Statistics

Waterloo 's average per capita income is $92,220. Household income levels show a median of $221,850. The poverty rate stands at 5.48%.

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$250,001-
Families$247,857$195,601
Households$221,850$190,450
Non Families--

$92,220

Average Income

$221,850

Median Household Income

5.48%

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)