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Lake County Illinois ☎ +1 847-377-2000 Last Updated: 08/23/2026 |
| Lake County is located in the northeastern corner of the state of Illinois, United States, along the shores of Lake Michigan. According to 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 serene and picturesque scenery of blooming flowers at the Lake County Forest Preserve to seasonal festivals, events, and live performances, along with countless shopping options, Lake County is a captivating destination year-round. | |
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