Shasta Lake, CA has a population of 10,151 and is the 3,902nd largest city in the United States. The population density is 930 per sq mi which is 300% higher than the California average and 926% higher than the national average. The median age in Shasta Lake is 37 which is approximately 3% higher than the California average of 36. In Shasta Lake, 53% of the population over 15 years of age are married, 94% speak English and 4% speak Spanish. 74% of Shasta Lake residents were born in California, 22% were born out of state, 0% were born outside of the United States and 4% were foreign born.