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Lake County Illinois ☎ +1 847-377-2000 Last Updated: 11/04/2025 |
| Lake County is a county located in the northeastern corner of the U.S. state of Illinois, along the shores of Lake Michigan. As of the 2020 census, the county had a population of 714,342, making it the third most populous county in Illinois. The county seat is Waukegan. | |
| From the peaceful and picturesque views of blooming flowers at Lake County Forest Preserve to seasonal festivals, events and live performances, and plenty of shopping options, Lake County is a destination that's always in season. | |
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