Hillsboro is the county seat for Montgomery County
Adjacent to Montgomery County, Illinois
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| On South Cleveland Street near Nobbe Street. |
| On Main Street at Monroe Street, on the right when traveling west on Main Street. |
| On South Main Street south of West Seward Street, on the right when traveling south. |
| On South Main Street at West Seward Street, on the right when traveling north on South Main Street. |
| On South Main Street south of West Seward Street, on the right when traveling south. Reported missing. |
| On South Main Street south of West Seward Street, on the right when traveling south. |
| On South Main Street at West Seward Street, on the right when traveling south on South Main Street. |
| On Courthouse Square at South Main Street, on the left when traveling east on Courthouse Square. |
| On State Street (Illinois Route 16) east of Pine Street, on the right when traveling east. |
| On Old Route 66 N, on the right when traveling north. |
| On Old Route 66 N, on the right when traveling south. |
| On West Kirkham Street east of Old U.S. 66, on the right when traveling east. |
| On West Kirkham Street near Old U.S. 66. |
| On Old Route 66 North south of West Kirkham Street, on the right when traveling north. |
| On East Union Avenue (Illinois Route 16) at North Monroe Street, on the right when traveling east on East Union Avenue. |
| On North Old Route 66, on the right when traveling north. |
| Near Old Route 66 North south of West Kirkham Street. |
| On Old Route 66 North south of West Kirkham Street, on the right when traveling north. |
| On West Kirkham Street east of Old U.S. 66, on the right when traveling east. |
| On Old Route 66 North just south of West Kirkham Street, on the left when traveling south. |
| On Old Rte 66 N, on the right when traveling south. |
| On West Kirkham Street east of Old U.S. 66, on the right when traveling east. |
| On Old Route 66 North south of West Kirkham Street, on the left when traveling south. |
| On Old Route 66 North at West Kirkham Street, on the left when traveling south on Old Route 66 North. |
| On West Union Street at North State Street, on the right when traveling east on West Union Street. |
| On Old Route 66 North west of West Kirkham Street, on the right when traveling south. |
| On Oberle Street at North Cedar Street, on the right when traveling east on Oberle Street. |
| On West Broad Street at Railroad Street, on the right when traveling east on West Broad Street. |
| Near Interstate 55 at milepost 65. |
| On West Frontage Road north of North 22nd Avenue ( Route 48), on the left when traveling north. |
| On Interstate 55 at milepost 65, 10.8 miles south of Main Street (County Road 17). |
