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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 Indiana

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

County or City SPCS27 Code SPCS83 Code
Adams 11301 1301
Allen 11301 1301
Bartholomew 11301 1301
Benton 11302 1302
Blackford 11301 1301
Boone 11302 1302
Brown 11301 1301
Carroll 11302 1302
Cass 11301 1301
Clark 11301 1301
Clay 11302 1302
Clinton 11302 1302
Crawford 11302 1302
Daviess 11302 1302
Dearborn 11301 1301
Decatur 11301 1301
De Kalb 11301 1301
Delaware 11301 1301
Dubois 11302 1302
Elkhart 11301 1301
Fayette 11301 1301
Floyd 11301 1301
Fountain 11302 1302
Franklin 11301 1301
Fulton 11301 1301
Gibson 11302 1302
Grant 11301 1301
Greene 11302 1302
Hamilton 11301 1301
Hancock 11301 1301
Harrison 11301 1301
Hendricks 11302 1302
Henry 11301 1301
Howard 11301 1301
Huntington 11301 1301
Jackson 11301 1301
Jasper 11302 1302
Jay 11301 1301
Jefferson 11301 1301
Jennings 11301 1301
Johnson 11301 1301
Knox 11302 1302
Kosciusko 11301 1301
Lagrange 11301 1301
Lake 11302 1302
La Porte 11302 1302
Lawrence 11302 1302
Madison 11301 1301
Marion 11301 1301
Marshall 11301 1301
Martin 11302 1302
Miami 11301 1301
Monroe 11302 1302
Montgomery 11302 1302
Morgan 11302 1302
Newton 11302 1302
Noble 11301 1301
Ohio 11301 1301
Orange 11302 1302
Owen 11302 1302
Parke 11302 1302
Perry 11302 1302
Pike 11302 1302
Porter 11302 1302
Posey 11302 1302
Pulaski 11302 1302
Putnam 11302 1302
Randolph 11301 1301
Ripley 11301 1301
Rush 11301 1301
St. Joseph 11301 1301
Scott 11301 1301
Shelby 11301 1301
Spencer 11302 1302
Starke 11302 1302
Steuben 11301 1301
Sullivan 11302 1302
Switzerland 11301 1301
Tippecanoe 11302 1302
Tipton 11301 1301
Union 11301 1301
Vanderburgh 11302 1302
Vermillion 11302 1302
Vigo 11302 1302
Wabash 11301 1301
Warren 11302 1302
Warrick 11302 1302
Washington 11301 1301
Wayne 11301 1301
Wells 11301 1301
White 11302 1302
Whitley 11301 1301

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