Lewiston, CA has a population of 1,320 and is the 13,468th largest city in the United States. The population density is 66 per sq mi which is 72% lower than the California average and 27% lower than the national average. The median age in Lewiston is 57 which is approximately 59% higher than the California average of 36. In Lewiston, 67% of the population over 15 years of age are married, 94% speak English and 5% speak Spanish. 64% of Lewiston residents were born in California, 32% were born out of state, 1% were born outside of the United States and 2% were foreign born.