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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 Ohio

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County or City SPCS27 Code SPCS83 Code
Adams 13402 3402
Allen 13401 3401
Ashland 13401 3401
Ashtabula 13401 3401
Athens 13402 3402
Auglaize 13401 3401
Belmont 13402 3402
Brown 13402 3402
Butler 13402 3402
Carroll 13401 3401
Champaign 13402 3402
Clark 13402 3402
Clermont 13402 3402
Clinton 13402 3402
Columbiana 13401 3401
Coshocton 13401 3401
Crawford 13401 3401
Cuyahoga 13401 3401
Darke 13402 3402
Defiance 13401 3401
Delaware 13401 3401
Erie 13401 3401
Fairfield 13402 3402
Fayette 13402 3402
Franklin 13402 3402
Fulton 13401 3401
Gallia 13402 3402
Geauga 13401 3401
Greene 13402 3402
Guernsey 13402 3402
Hamilton 13402 3402
Hancock 13401 3401
Hardin 13401 3401
Harrison 13401 3401
Henry 13401 3401
Highland 13402 3402
Hocking 13402 3402
Holmes 13401 3401
Huron 13401 3401
Jackson 13402 3402
Jefferson 13401 3401
Knox 13401 3401
Lake 13401 3401
Lawrence 13402 3402
Licking 13402 3402
Logan 13401 3401
Lorain 13401 3401
Lucas 13401 3401
Madison 13402 3402
Mahoning 13401 3401
Marion 13401 3401
Medina 13401 3401
Meigs 13402 3402
Mercer 13401 3401
Miami 13402 3402
Monroe 13402 3402
Montgomery 13402 3402
Morgan 13402 3402
Morrow 13401 3401
Muskingum 13402 3402
Noble 13402 3402
Ottawa 13401 3401
Paulding 13401 3401
Perry 13402 3402
Pickaway 13402 3402
Pike 13402 3402
Portage 13401 3401
Preble 13402 3402
Putnam 13401 3401
Richland 13401 3401
Ross 13402 3402
Sandusky 13401 3401
Scioto 13402 3402
Seneca 13401 3401
Shelby 13401 3401
Stark 13401 3401
Summit 13401 3401
Trumbull 13401 3401
Tuscarawas 13401 3401
Union 13401 3401
Van Wert 13401 3401
Vinton 13402 3402
Warren 13402 3402
Washington 13402 3402
Wayne 13401 3401
Williams 13401 3401
Wood 13401 3401
Wyandot 13401 3401

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