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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 Mississippi

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County or City SPCS27 Code SPCS83 Code
Adams 12302 2302
Alcorn 12301 2301
Amite 12302 2302
Attala 12301 2301
Benton 12301 2301
Bolivar 12302 2302
Calhoun 12301 2301
Carroll 12302 2302
Chickasaw 12301 2301
Choctaw 12301 2301
Claiborne 12302 2302
Clarke 12301 2301
Clay 12301 2301
Coahoma 12302 2302
Copiah 12302 2302
Covington 12301 2301
DeSoto 12302 2302
Forrest 12301 2301
Franklin 12302 2302
George 12301 2301
Greene 12301 2301
Grenada 12302 2302
Hancock 12301 2301
Harrison 12301 2301
Hinds 12302 2302
Holmes 12302 2302
Humphreys 12302 2302
Issaquena 12302 2302
Itawamba 12301 2301
Jackson 12301 2301
Jasper 12301 2301
Jefferson 12302 2302
Jefferson Davis 12302 2302
Jones 12301 2301
Kemper 12301 2301
Lafayette 12301 2301
Lamar 12301 2301
Lauderdale 12301 2301
Lawrence 12302 2302
Leake 12301 2301
Lee 12301 2301
Leflore 12302 2302
Lincoln 12302 2302
Lowndes 12301 2301
Madison 12302 2302
Marion 12302 2302
Marshall 12301 2301
Monroe 12301 2301
Montgomery 12302 2302
Neshoba 12301 2301
Newton 12301 2301
Noxubee 12301 2301
Oktibbeha 12301 2301
Panola 12302 2302
Pearl River 12301 2301
Perry 12301 2301
Pike 12302 2302
Pontotoc 12301 2301
Prentiss 12301 2301
Quitman 12302 2302
Rankin 12302 2302
Scott 12301 2301
Sharkey 12302 2302
Simpson 12302 2302
Smith 12301 2301
Stone 12301 2301
Sunflower 12302 2302
Tallahatchie 12302 2302
Tate 12302 2302
Tippah 12301 2301
Tishomingo 12301 2301
Tunica 12302 2302
Union 12301 2301
Walthall 12302 2302
Warren 12302 2302
Washington 12302 2302
Wayne 12301 2301
Webster 12301 2301
Wilkinson 12302 2302
Winston 12301 2301
Yalobusha 12302 2302
Yazoo 12302 2302

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