Rowland Heights, CA has a population of 50,281 and is the 812th largest city in the United States. The population density is 3,846 per sq mi which is 1555% higher than the California average and 4145% higher than the national average. The median age in Rowland Heights is 42 which is approximately 16% higher than the California average of 36. In Rowland Heights, 58% of the population over 15 years of age are married, 27% speak English and 20% speak Spanish. 38% of Rowland Heights residents were born in California, 5% were born out of state, 1% were born outside of the United States and 55% were foreign born.