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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 Tennessee

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County or City SPCS27 Code SPCS83 Code
Anderson 14100 4100
Bedford 14100 4100
Benton 14100 4100
Bledsoe 14100 4100
Blount 14100 4100
Bradley 14100 4100
Campbell 14100 4100
Cannon 14100 4100
Carroll 14100 4100
Carter 14100 4100
Cheatham 14100 4100
Chester 14100 4100
Claiborne 14100 4100
Clay 14100 4100
Cocke 14100 4100
Coffee 14100 4100
Crockett 14100 4100
Cumberland 14100 4100
Davidson 14100 4100
Decatur 14100 4100
DeKalb 14100 4100
Dickson 14100 4100
Dyer 14100 4100
Fayette 14100 4100
Fentress 14100 4100
Franklin 14100 4100
Gibson 14100 4100
Giles 14100 4100
Grainger 14100 4100
Greene 14100 4100
Grundy 14100 4100
Hamblen 14100 4100
Hamilton 14100 4100
Hancock 14100 4100
Hardeman 14100 4100
Hardin 14100 4100
Hawkins 14100 4100
Haywood 14100 4100
Henderson 14100 4100
Henry 14100 4100
Hickman 14100 4100
Houston 14100 4100
Humphreys 14100 4100
Jackson 14100 4100
Jefferson 14100 4100
Johnson 14100 4100
Knox 14100 4100
Lake 14100 4100
Lauderdale 14100 4100
Lawrence 14100 4100
Lewis 14100 4100
Lincoln 14100 4100
Loudon 14100 4100
McMinn 14100 4100
McNairy 14100 4100
Macon 14100 4100
Madison 14100 4100
Marion 14100 4100
Marshall 14100 4100
Maury 14100 4100
Meigs 14100 4100
Monroe 14100 4100
Montgomery 14100 4100
Moore 14100 4100
Morgan 14100 4100
Obion 14100 4100
Overton 14100 4100
Perry 14100 4100
Pickett 14100 4100
Polk 14100 4100
Putnam 14100 4100
Rhea 14100 4100
Roane 14100 4100
Robertson 14100 4100
Rutherford 14100 4100
Scott 14100 4100
Sequatchie 14100 4100
Sevier 14100 4100
Shelby 14100 4100
Smith 14100 4100
Stewart 14100 4100
Sullivan 14100 4100
Sumner 14100 4100
Tipton 14100 4100
Trousdale 14100 4100
Unicoi 14100 4100
Union 14100 4100
Van Buren 14100 4100
Warren 14100 4100
Washington 14100 4100
Wayne 14100 4100
Weakley 14100 4100
White 14100 4100
Williamson 14100 4100
Wilson 14100 4100

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