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The State Plane Coordinate System

The State Plane Coordinate System (SPS or SPCS) is a set of 124 geographic zones or coordinate systems designed for specific regions of the United States. Each state contains one or more state plane zones, the boundaries of which usually follow county lines. There are 110 zones in the continental US, with 10 more in Alaska, 5 in Hawaii, and one for Puerto Rico and US Virgin Islands. The system is widely used for geographic data by state and local governments. Its popularity is due to at least two factors. First, it uses a simple Cartesian coordinate system to specify locations rather than a more complex spherical coordinate system (the geographic coordinate system of latitude and longitude). By thus ignoring the curvature of the Earth, "plane surveying" methods can be used, speeding up and simplifying calculations. Second, the system is highly accurate within each zone (error less than 1:10,000). Outside a specific state plane zone accuracy rapidly declines, thus the system is not useful for regional or national mapping.

Most state plane zones are based on either a Transverse Mercator projection or a Lambert conformal conic projection. The choice between the two map projections is based on the shape of the state and its zones. States that are long in the east-west direction are typically divided into zones that are also long east-west. These zones use the Lambert conformal conic projection, because it is good at maintaining accuracy along an east-west axis. Zones that are long in the north-south direction use the Transverse Mercator projection because it is better at maintaining accuracy along a north-south axis. The panhandle of Alaska, whose maximum dimension is on a diagonal, uses an Oblique Mercator projection, which minimizes the combined error in the X and Y directions.


All State Plane zones in South Dakota

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County or City SPCS27 Code SPCS83 Code
Aurora 14002 4002
Beadle 14001 4001
Bennett 14002 4002
Bon Homme 14002 4002
Brookings 14001 4001
Brown 14001 4001
Brule 14002 4002
Buffalo 14002 4002
Butte 14001 4001
Campbell 14001 4001
Charles Mix 14002 4002
Clark 14001 4001
Clay 14002 4002
Codington 14001 4001
Corson 14001 4001
Custer 14002 4002
Davison 14002 4002
Day 14001 4001
Deuel 14001 4001
Dewey 14001 4001
Douglas 14002 4002
Edmunds 14001 4001
Fall River 14002 4002
Faulk 14001 4001
Grant 14001 4001
Gregory 14002 4002
Haakon 14002 4002
Hamlin 14001 4001
Hand 14001 4001
Hanson 14002 4002
Harding 14001 4001
Hughes 14002 4002
Hutchinson 14002 4002
Hyde 14001 4001
Jackson 14002 4002
Jerauld 14002 4002
Jones 14002 4002
Kingsbury 14001 4001
Lake 14002 4002
Lawrence 14001 4001
Lincoln 14002 4002
Lyman 14002 4002
McCook 14002 4002
McPherson 14001 4001
Marshall 14001 4001
Meade 14001 4001
Mellette 14002 4002
Miner 14002 4002
Minnehaha 14002 4002
Moody 14002 4002
Pennington 14002 4002
Perkins 14001 4001
Potter 14001 4001
Roberts 14001 4001
Sanborn 14002 4002
Shannon 14002 4002
Spink 14001 4001
Stanley 14002 4002
Sully 14001 4001
Todd 14002 4002
Tripp 14002 4002
Turner 14002 4002
Union 14002 4002
Walworth 14001 4001
Yankton 14002 4002
Ziebach 14001 4001

Click here to go back to the list off all State Plane grids