Grayslake, Illinois, United States [Village]; population was 7,388 in 1990; housing units was 3,019 in 1990; location is 42°21'N 88°2'W; land area is 4.14 square miles (2,649 acres); water area is 0.13 square miles (80 acres); FIPS code is 31121 [SourceCBP]