Glendora, CA has a population of 51,285 and is the 793rd largest city in the United States. The population density is 2,623 per sq mi which is 1029% higher than the California average and 2795% higher than the national average. The median age in Glendora is 41 which is approximately 14% higher than the California average of 36. In Glendora, 57% of the population over 15 years of age are married, 72% speak English and 15% speak Spanish. 67% of Glendora residents were born in California, 15% were born out of state, 1% were born outside of the United States and 17% were foreign born.