Sussex is a city located in Waukesha County Wisconsin. With a 2020 population of 11,279, it is the 82nd largest city in Wisconsin and the 2858th largest city in the United States . Sussex is currently growing at a rate of 1.34% annually and its population has increased by 7.24% since the most recent census, which recorded a population of 10,518 in 2010. Sussex reached it's highest population of 11,279 in 2021. Spanning over 8 miles, Sussex has a population density of 1,449 people per square mile.
The average household income in Sussex is $103,204 with a poverty rate of 5.49%. The median rental costs in recent years comes to $987 per month, and the median house value is $286,300. The median age in Sussex is 37.5 years, 35.1 years for males, and 39.5 years for females.