US Principal Meridians
The US PLSS uses 37 principal meridians as north-south reference lines. Each meridian serves as the origin for townships and ranges in its coverage area.
US Principal Meridians
The US PLSS uses 37 principal meridians as north-south reference lines. Each meridian serves as the origin for townships and ranges in its coverage area.
Read guideIndian Meridian
The Indian Meridian is the principal meridian used for all PLSS surveys in Oklahoma, established in 1870 after the federal survey of Indian Territory.
Read guideSixth Principal Meridian
The Sixth Principal Meridian is the most widely used reference line in the US Public Land Survey System, covering Colorado, Kansas, Nebraska, Wyoming, and South Dakota.
Read guideWillamette Meridian
The Willamette Meridian is the principal meridian for PLSS surveys in Oregon and Washington, established in 1851 from the Willamette Stone near Portland.
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