Illinois-Indiana State Line Boundary Marker, Sandstone boundary marker in Hammond, United States.
The Illinois-Indiana State Line Boundary Marker stands as a solid obelisk constructed from sandstone blocks, marking the precise border between two states.
The Office of the United States Surveyor General constructed this boundary marker in 1838, making it one of the earliest structures still standing in Chicago.
The marker represents the establishment of state boundaries during the westward expansion period, demonstrating early American land management practices.
Located near Avenue G and 103rd Street, the marker sits at coordinates 41°42′28″N 87°31′28″W, positioned within both Illinois and Indiana territories.
In 1988, engineers relocated the marker 191.09 feet north while maintaining its position directly on the state line between Illinois and Indiana.
Location: Hammond
GPS coordinates: 41.70780,-87.52450
Latest update: March 10, 2025 05:23
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