Blythe, CA has a population of 19,675 and is the 2,214th largest city in the United States. The population density is 741 per sq mi which is 219% higher than the California average and 717% higher than the national average. The median age in Blythe is 38 which is approximately 5% higher than the California average of 36. In Blythe, 42% of the population over 15 years of age are married, 57% speak English and 40% speak Spanish. 63% of Blythe residents were born in California, 18% were born out of state, 1% were born outside of the United States and 18% were foreign born.