Columbia, CA has a population of 2,770 and is the 9,206th largest city in the United States. The population density is 465 per sq mi which is 100% higher than the California average and 413% higher than the national average. The median age in Columbia is 44 which is approximately 23% higher than the California average of 36. In Columbia, 58% of the population over 15 years of age are married, 96% speak English and 2% speak Spanish. 75% of Columbia residents were born in California, 22% were born out of state, 1% were born outside of the United States and 2% were foreign born.