Hillsborough is a city located in California. With a 2020 population of 11,269, it is the 363rd largest city in California and the 2861st largest city in the United States. Hillsborough is currently declining at a rate of -0.52% annually but its population has increased by 4.10% since the most recent census, which recorded a population of 10,825 in 2010. Hillsborough reached it's highest population of 11,490 in 2016. Spanning over 6 miles, Hillsborough has a population density of 1,820 people per square mile.
The average household income in Hillsborough is $438,734 with a poverty rate of 2.42%. The median rental costs in recent years comes to $3,490 per month, and the median house value is $2.00 Mn. The median age in Hillsborough is 47.9 years, 47.9 years for males, and 47.8 years for females. For every 100 females there are 98.2 males.