Fourth principal meridian, Geographic reference line in central Illinois, United States
The Fourth Principal Meridian extends through multiple counties in Illinois, serving as a fundamental north-south reference line for land measurements and property boundaries.
Established in 1815, this meridian became instrumental in the systematic land division during the western expansion of the United States in the 19th century.
The meridian shaped the development of communities and agricultural patterns across Illinois by providing a structured framework for land distribution and settlement.
Modern surveyors and property administrators continue to use the Fourth Principal Meridian coordinates to define legal boundaries and conduct precise land measurements.
The initial point of the meridian sits at 40°0′50″N 90°27′11″W on the western bank of the Illinois River in Schuyler County.
Location: Illinois
GPS coordinates: 40.01390,-90.45310
Latest update: March 12, 2025 15:37
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