Walnut is a city located in California. With a 2020 population of 29,235, it is the 248th largest city in California and the 1321st largest city in the United States. Walnut is currently declining at a rate of -0.76% annually but its population has increased by 0.22% since the most recent census, which recorded a population of 29,172 in 2010. Walnut reached it's highest population of 30,015 in 2017. Spanning over 9 miles, Walnut has a population density of 3,251 people per square mile.
The average household income in Walnut is $130,171 with a poverty rate of 6.55%. The median rental costs in recent years comes to $2,359 per month, and the median house value is $774,400. The median age in Walnut is 45.9 years, 44 years for males, and 47.3 years for females. For every 100 females there are 95.8 males.