Mammoth Lakes, CA has a population of 8,035 and is the 4,665th largest city in the United States. The population density is 323 per sq mi which is 39% higher than the California average and 257% higher than the national average. The median age in Mammoth Lakes is 32 which is approximately 11% lower than the California average of 36. In Mammoth Lakes, 39% of the population over 15 years of age are married, 66% speak English and 31% speak Spanish. 62% of Mammoth Lakes residents were born in California, 13% were born out of state, 2% were born outside of the United States and 23% were foreign born.