San Lucas, CA has a population of 362 and is the 21,419th largest city in the United States. The population density is 918 per sq mi which is 295% higher than the California average and 914% higher than the national average. The median age in San Lucas is 39 which is approximately 8% higher than the California average of 36. In San Lucas, 45% of the population over 15 years of age are married, 33% speak English and 67% speak Spanish. 59% of San Lucas residents were born in California, 12% were born out of state, 2% were born outside of the United States and 26% were foreign born.