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Frankfort Square is an unincorporated community and census-designated place in Frankfort Township, Will County, in Chicago's far southwest suburbs.

Frankfort Square had 8,968 residents at the 2020 census, just below its 2010 count of 9,276 and well above the 7,766 counted in 2000, when the suburb was still rapidly filling in.

Frankfort Square's residents lived in 3,119 households at the 2020 census, in a housing stock of 3,160 units with a vacancy rate of only 1.3 percent.

Frankfort Square covers roughly 2.5 square miles of entirely landlocked suburban development, bordered by Frankfort to the south, Tinley Park to the north, and Matteson in Cook County to the east.

Frankfort Square began as a classic family bedroom community: at the 2000 census nearly 58 percent of its households included children under 18, and its average household size was 3.29 people.

Frankfort Square's median age was 38.9 years at the 2020 census, and about 22.5 percent of its residents were under 18.

Frankfort Square has become notably more diverse over two decades, with its Hispanic or Latino population rising from 4.0 percent in 2000 to 10.2 percent in 2020.

Frankfort Square children attend Summit Hill School District 161 schools, and its high schoolers go to Lincoln-Way Community High School District 210.

Frankfort Square maintains its own Frankfort Square Park District to run parks and recreation for the unincorporated community.