Lockport is a city in Will County, Illinois, United States, located 30 miles southwest of Chicago. Per the 2020 census, the population was 26,094. The city was incorporated in 1853. It is situated along the Illinois and Michigan (I&M) Canal, and was the headquarters of the canal when the canal was operating. A section of the canal runs through Lockport, including the remains of the canal's Lock No. 1 from which the town received its name. The canal right-of-way is now the Illinois and Michigan National Heritage Corridor.

Will County is a county in the northeastern part of the state of Illinois. According to the 2020 census, it had a population of 696,355, an increase of 2.8% from 677,560 in 2010, making it Illinois's fourth-most populous county. The county seat is Joliet. Will County is one of the five collar counties of the Chicago–Naperville–Elgin, IL–IN–WI Metropolitan Statistical Area. The portion of Will County around Joliet uses area codes 815 and 779, while 630 and 331 are for far northern Will County and 708 is for central and eastern Will County.