As of the census of 2000, there were 3,909 people, 1,272 households, and 1,074 families residing in the village. The population density was 606.1 people per square mile (234.0/km²). There were 1,297 housing units at an average density of 201.1/sq mi (77.6/km²). The racial makeup of the village was 95.86% White, 1.38% African American, 0.03% Native American, 0.51% Asian, 1.28% from other races, and 0.95% from two or more races. Hispanic or Latino of any race were 4.43% of the population.
There were 1,272 households out of which 47.2% had children under the age of 18 living with them, 76.7% were married couples living together, 5.1% had a female householder with no husband present, and 15.5% were non-families. 12.0% of all households were made up of individuals and 2.9% had someone living alone who was 65 years of age or older. The average household size was 3.07 and the average family size was 3.37.
In the village the population was spread out with 32.4% under the age of 18, 5.9% from 18 to 24, 33.9% from 25 to 44, 23.1% from 45 to 64, and 4.7% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 102.5 males. For every 100 females age 18 and over, there were 99.3 males.
The median income for a household in the village was $75,856, and the median income for a family was $83,332. Males had a median income of $52,425 versus $35,028 for females. The per capita income for the village was $30,299. About 1.1% of families and 1.8% of the population were below the poverty line, including 1.5% of those under age 18 and 3.4% of those age 65 or over.
Sugar Grove is accessible by two state highways, Illinois Route 47 and Illinois Route 56, which enters the east side of the village as an expressway. Route 56 connects with Interstate 88, which runs along the northern edge of Sugar Grove. US 30 also passes through the village. Aurora Municipal Airport is situated on the northwest side of town, capable of handling small jets. The Virgil Gilman Trail is a paved bicycle trail connecting the City of Aurora with Waubonsee Community College.