Williamsville is a city located in Sangamon County Illinois. With a 2020 population of 1,415, it is the 586th largest city in Illinois and the 12906th largest city in the United States. Williamsville is currently declining at a rate of -0.35% annually and its population has decreased by -3.61% since the most recent census, which recorded a population of 1,468 in 2020. Spanning over 1 miles, Williamsville has a population density of 1,177 people per square mile.
The average household income in Williamsville is $99,726 with a poverty rate of 9.82%. The median rental costs in recent years comes to $803 per month, and the median house value is $162,900. The median age in Williamsville is 38.7 years, 35.7 years for males, and 40.4 years for females.
According to the most recent ACS, the racial composition of Williamsvillewas:
Rate of Home Ownership
Average Family Size
Average Household Size
The highest rate of high school graduation is among asian people with a rate of 100.00%.
The highest rate of bachelors degrees is among 2+ races people with a rate of 75.86%.
98.92% of Williamsville residents speak only English, while 1.08% speak other languages. The non-English language spoken by the largest group is Asian and Pacific Island languages, which is spoken by 0.65% of the population.
Overall Poverty Rate
Male Poverty Rate
Female Poverty Rate
The race most likely to be in poverty in Williamsville is Asian, with 36.36% below the poverty level.
The race least likely to be in poverty in Williamsville is Other, with NaN% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 1.98%. Among those working part-time, it was 12.44%, and for those that did not work, the poverty rate was 23.36%.
Number of Veterans
Veteran Poverty Rate
Veteran Disability Rate
Labor Force Participation
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
Born in Williamsville
99.18% of Williamsville residents were born in the United States, with 90.33% having been born in Illinois. 0.48% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.