Williamsville is a city located in New York. With a 2020 population of 5,259, it is the 164th largest city in New York and the 4609th largest city in the United States. Williamsville is currently growing at a rate of 0.23% annually but its population has decreased by -0.77% since the most recent census, which recorded a population of 5,300 in 2010. Williamsville reached it's highest population of 6,835 in 1970. Spanning over 1 miles, Williamsville has a population density of 4,181 people per square mile.
The average household income in Williamsville is $81,676 with a poverty rate of 10.45%. The median rental costs in recent years comes to $984 per month, and the median house value is $167,800. The median age in Williamsville is 46.7 years, 43.8 years for males, and 48.5 years for females. For every 100 females there are 82.9 males.