Byron, CA has a population of 1,429 and is the 12,978th largest city in the United States. The population density is 219 per sq mi which is 6% lower than the California average and 142% higher than the national average. The median age in Byron is 37 which is approximately 1% higher than the California average of 36. In Byron, 65% of the population over 15 years of age are married, 71% speak English and 28% speak Spanish. 60% of Byron residents were born in California, 17% were born out of state, 1% were born outside of the United States and 22% were foreign born.