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© 2026 STATLAS. Data under CC BY 4.0 from World Bank, GeoNames, Open-Meteo & others.

Indices labeled “modeled” are computed estimates — see methodology.

CitiesCastaicPopulation

Population in Castaic

United States · Castaic profile

Population

19,015

people

World rank

#28237

of 33750

Percentile

16%

higher is better

Data quality

Measured

Total resident population.

Source: GeoNames · source data.

See full ranking About this metric Castaic profile

FAQ

Frequently asked

What is the population in Castaic?

Castaic has a population of 19,015 people. Total resident population.

How does Castaic rank for population?

Castaic ranks #28237 of 33750 cities for population (higher is better).