Geologic Terms and Geographic Divisions'.

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Public Land Survey System - the basis of most meridians in the United States.

Ohio River (1785) - also part of Indiana.

Base Line of the United States Military Survey (1797).

Some parts of the Ohio Lands (now Ohio) were laid out in survey townships, but based on other points not listed above: Followed by Guide Road / Old Guide Road / Washington State Route 539 in Whatcom County, Meridian Street in Bellingham, Washington. Illinois (W of Illinois River and 3rd principal meridian)ġ2 miles east of Willamette Meridian, much of which is in Salish Sea at this latitude. State names usually signify only parts of each listed state, unless otherwise indicated.īased on the BLM manual's 1973 publication date, and the reference to Clarke's Spheroid of 1866 in section 2-82, coordinates appear to be in the NAD27 datum. Primarily from the United States Government Printing Office Style Manual. This is a list of principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS.

This list is incomplete you can help by adding missing items.

Meridian township map