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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 Georgia

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County or City SPCS27 Code SPCS83 Code
Appling 11001 1001
Atkinson 11001 1001
Bacon 11001 1001
Baker 11002 1002
Baldwin 11001 1001
Banks 11002 1002
Barrow 11002 1002
Bartow 11002 1002
Ben Hill 11002 1002
Berrien 11002 1002
Bibb 11002 1002
Bleckley 11002 1002
Brantley 11001 1001
Brooks 11002 1002
Bryan 11001 1001
Bulloch 11001 1001
Burke 11001 1001
Butts 11002 1002
Calhoun 11002 1002
Camden 11001 1001
Candler 11001 1001
Carroll 11002 1002
Catoosa 11002 1002
Charlton 11001 1001
Chatham 11001 1001
Chattahoochee 11002 1002
Chattooga 11002 1002
Cherokee 11002 1002
Clarke 11002 1002
Clay 11002 1002
Clayton 11002 1002
Clinch 11001 1001
Cobb 11002 1002
Coffee 11001 1001
Colquitt 11002 1002
Columbia 11001 1001
Cook 11002 1002
Coweta 11002 1002
Crawford 11002 1002
Crisp 11002 1002
Dade 11002 1002
Dawson 11002 1002
Decatur 11002 1002
DeKalb 11002 1002
Dodge 11001 1001
Dooly 11002 1002
Dougherty 11002 1002
Douglas 11002 1002
Early 11002 1002
Echols 11001 1001
Effingham 11001 1001
Elbert 11001 1001
Emanuel 11001 1001
Evans 11001 1001
Fannin 11002 1002
Fayette 11002 1002
Floyd 11002 1002
Forsyth 11002 1002
Franklin 11001 1001
Fulton 11002 1002
Gilmer 11002 1002
Glascock 11001 1001
Glynn 11001 1001
Gordon 11002 1002
Grady 11002 1002
Greene 11001 1001
Gwinnett 11002 1002
Habersham 11002 1002
Hall 11002 1002
Hancock 11001 1001
Haralson 11002 1002
Harris 11002 1002
Hart 11001 1001
Heard 11002 1002
Henry 11002 1002
Houston 11002 1002
Irwin 11002 1002
Jackson 11002 1002
Jasper 11002 1002
Jeff Davis 11001 1001
Jefferson 11001 1001
Jenkins 11001 1001
Johnson 11001 1001
Jones 11002 1002
Lamar 11002 1002
Lanier 11002 1002
Laurens 11001 1001
Lee 11002 1002
Liberty 11001 1001
Lincoln 11001 1001
Long 11001 1001
Lowndes 11002 1002
Lumpkin 11002 1002
McDuffie 11001 1001
McIntosh 11001 1001
Macon 11002 1002
Madison 11001 1001
Marion 11002 1002
Meriwether 11002 1002
Miller 11002 1002
Mitchell 11002 1002
Monroe 11002 1002
Montgomery 11001 1001
Morgan 11002 1002
Murray 11002 1002
Muscogee 11002 1002
Newton 11002 1002
Oconee 11002 1002
Oglethorpe 11001 1001
Paulding 11002 1002
Peach 11002 1002
Pickens 11002 1002
Pierce 11001 1001
Pike 11002 1002
Polk 11002 1002
Pulaski 11002 1002
Putnam 11002 1002
Quitman 11002 1002
Rabun 11002 1002
Randolph 11002 1002
Richmond 11001 1001
Rockdale 11002 1002
Schley 11002 1002
Screven 11001 1001
Seminole 11002 1002
Spalding 11002 1002
Stephens 11001 1001
Stewart 11002 1002
Sumter 11002 1002
Talbot 11002 1002
Taliaferro 11001 1001
Tattnall 11001 1001
Taylor 11002 1002
Telfair 11001 1001
Terrell 11002 1002
Thomas 11002 1002
Tift 11002 1002
Toombs 11001 1001
Towns 11002 1002
Treutlen 11001 1001
Troup 11002 1002
Turner 11002 1002
Twiggs 11002 1002
Union 11002 1002
Upson 11002 1002
Walker 11002 1002
Walton 11002 1002
Ware 11001 1001
Warren 11001 1001
Washington 11001 1001
Wayne 11001 1001
Webster 11002 1002
Wheeler 11001 1001
White 11002 1002
Whitfield 11002 1002
Wilcox 11002 1002
Wilkes 11001 1001
Wilkinson 11001 1001
Worth 11002 1002

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