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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 Kentucky

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

County or City SPCS27 Code SPCS83 Code
Adair 11602 1602
Allen 11602 1602
Anderson 11601 1601
Ballard 11602 1602
Barren 11602 1602
Bath 11601 1601
Bell 11602 1602
Boone 11601 1601
Bourbon 11601 1601
Boyd 11601 1601
Boyle 11602 1602
Bracken 11601 1601
Breathitt 11602 1602
Breckinridge 11602 1602
Bullitt 11601 1601
Butler 11602 1602
Caldwell 11602 1602
Calloway 11602 1602
Campbell 11601 1601
Carlisle 11602 1602
Carroll 11601 1601
Carter 11601 1601
Casey 11602 1602
Christian 11602 1602
Clark 11601 1601
Clay 11602 1602
Clinton 11602 1602
Crittenden 11602 1602
Cumberland 11602 1602
Daviess 11602 1602
Edmonson 11602 1602
Elliott 11601 1601
Estill 11602 1602
Fayette 11601 1601
Fleming 11601 1601
Floyd 11602 1602
Franklin 11601 1601
Fulton 11602 1602
Gallatin 11601 1601
Garrard 11602 1602
Grant 11601 1601
Graves 11602 1602
Grayson 11602 1602
Green 11602 1602
Greenup 11601 1601
Hancock 11602 1602
Hardin 11602 1602
Harlan 11602 1602
Harrison 11601 1601
Hart 11602 1602
Henderson 11602 1602
Henry 11601 1601
Hickman 11602 1602
Hopkins 11602 1602
Jackson 11602 1602
Jefferson 11601 1601
Jessamine 11601 1601
Johnson 11602 1602
Kenton 11601 1601
Knott 11602 1602
Knox 11602 1602
Larue 11602 1602
Laurel 11602 1602
Lawrence 11601 1601
Lee 11602 1602
Leslie 11602 1602
Letcher 11602 1602
Lewis 11601 1601
Lincoln 11602 1602
Livingston 11602 1602
Logan 11602 1602
Lyon 11602 1602
McCracken 11602 1602
McCreary 11602 1602
McLean 11602 1602
Madison 11602 1602
Magoffin 11602 1602
Marion 11602 1602
Marshall 11602 1602
Martin 11602 1602
Mason 11601 1601
Meade 11602 1602
Menifee 11601 1601
Mercer 11602 1602
Metcalfe 11602 1602
Monroe 11602 1602
Montgomery 11601 1601
Morgan 11601 1601
Muhlenberg 11602 1602
Nelson 11602 1602
Nicholas 11601 1601
Ohio 11602 1602
Oldham 11601 1601
Owen 11601 1601
Owsley 11602 1602
Pendleton 11601 1601
Perry 11602 1602
Pike 11602 1602
Powell 11602 1602
Pulaski 11602 1602
Robertson 11601 1601
Rockcastle 11602 1602
Rowan 11601 1601
Russell 11602 1602
Scott 11601 1601
Shelby 11601 1601
Simpson 11602 1602
Spencer 11601 1601
Taylor 11602 1602
Todd 11602 1602
Trigg 11602 1602
Trimble 11601 1601
Union 11602 1602
Warren 11602 1602
Washington 11602 1602
Wayne 11602 1602
Webster 11602 1602
Whitley 11602 1602
Wolfe 11602 1602
Woodford 11601 1601

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