Main Lake   Be the first to submit input for Main Lake. If you have info on Main Lake, Hamilton County, Illinois please submit it here to improve this web site.          These outdoors activities are available near Main Lake.   Public Lands Near Main Lake: Shawnee National Forest, Illinois, 30 miles away Harmonie State Park, Indiana, 30 miles away   Hotels Near Main Lake: Super 8 Harrisburg, Harrisburg, 20 miles away Comfort Inn Harrisburg, Harrisburg, 20 miles away Super 8 Grayville, Grayville, 29 miles away Fairbridge Inn Express at Windsor Oaks, Grayville, 29 miles away New Harmony Inn, New Harmony, 32 miles away