Berkeley, MO has a population of 9,068 and is the 4,234th largest city in the United States. The population density is 1,818 per sq mi which is 2004% higher than the Missouri average and 1906% higher than the national average. The median age in Berkeley is 33 which is approximately 14% lower than the Missouri average of 38. In Berkeley, 33% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 77% of Berkeley residents were born in Missouri, 20% were born out of state, 0% were born outside of the United States and 3% were foreign born.