Waterloo, CA has a population of 496 and is the 19,589th largest city in the United States. The population density is 91 per sq mi which is 61% lower than the California average and 1% higher than the national average. The median age in Waterloo is 50 which is approximately 39% higher than the California average of 36. In Waterloo, 75% of the population over 15 years of age are married, 96% speak English and 4% speak Spanish. 89% of Waterloo residents were born in California, 5% were born out of state, 0% were born outside of the United States and 6% were foreign born.
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The population density in Waterloo is 61% lower than California.
The median age in Waterloo is 39% higher than California.
In Waterloo 83.06% of the population is White.
In Waterloo 0.00% of the population is Black or African American.