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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 Oklahoma

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County or City SPCS27 Code SPCS83 Code
Adair 13501 3501
Alfalfa 13501 3501
Atoka 13502 3502
Beaver 13501 3501
Beckham 13502 3502
Blaine 13501 3501
Bryan 13502 3502
Caddo 13502 3502
Canadian 13501 3501
Carter 13502 3502
Cherokee 13501 3501
Choctaw 13502 3502
Cimarron 13501 3501
Cleveland 13502 3502
Coal 13502 3502
Comanche 13502 3502
Cotton 13502 3502
Craig 13501 3501
Creek 13501 3501
Custer 13501 3501
Delaware 13501 3501
Dewey 13501 3501
Ellis 13501 3501
Garfield 13501 3501
Garvin 13502 3502
Grady 13502 3502
Grant 13501 3501
Greer 13502 3502
Harmon 13502 3502
Harper 13501 3501
Haskell 13502 3502
Hughes 13502 3502
Jackson 13502 3502
Jefferson 13502 3502
Johnston 13502 3502
Kay 13501 3501
Kingfisher 13501 3501
Kiowa 13502 3502
Latimer 13502 3502
Le Flore 13502 3502
Lincoln 13501 3501
Logan 13501 3501
Love 13502 3502
McClain 13502 3502
McCurtain 13502 3502
McIntosh 13502 3502
Major 13501 3501
Marshall 13502 3502
Mayes 13501 3501
Murray 13502 3502
Muskogee 13501 3501
Noble 13501 3501
Nowata 13501 3501
Okfuskee 13501 3501
Oklahoma 13501 3501
Okmulgee 13501 3501
Osage 13501 3501
Ottawa 13501 3501
Pawnee 13501 3501
Payne 13501 3501
Pittsburg 13502 3502
Pontotoc 13502 3502
Pottawatomie 13502 3502
Pushmataha 13502 3502
Roger Mills 13501 3501
Rogers 13501 3501
Seminole 13502 3502
Sequoyah 13501 3501
Stephens 13502 3502
Texas 13501 3501
Tillman 13502 3502
Tulsa 13501 3501
Wagoner 13501 3501
Washington 13501 3501
Washita 13502 3502
Woods 13501 3501
Woodward 13501 3501

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