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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 Virginia

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

County or City SPCS27 Code SPCS83 Code
Accomack 14502 4502
Albemarle 14502 4502
Alleghany 14502 4502
Amelia 14502 4502
Amherst 14502 4502
Appomattox 14502 4502
Arlington 14501 4501
Augusta 14501 4501
Bath 14501 4501
Bedford 14502 4502
Bland 14502 4502
Botetourt 14502 4502
Brunswick 14502 4502
Buchanan 14502 4502
Buckingham 14502 4502
Campbell 14502 4502
Caroline 14501 4501
Carroll 14502 4502
Charles City 14502 4502
Charlotte 14502 4502
Chesterfield 14502 4502
Clarke 14501 4501
Craig 14502 4502
Culpeper 14501 4501
Cumberland 14502 4502
Dickenson 14502 4502
Dinwiddie 14502 4502
Essex 14502 4502
Fairfax 14501 4501
Fauquier 14501 4501
Floyd 14502 4502
Fluvanna 14502 4502
Franklin 14502 4502
Frederick 14501 4501
Giles 14502 4502
Gloucester 14502 4502
Goochland 14502 4502
Grayson 14502 4502
Greene 14501 4501
Greensville 14502 4502
Halifax 14502 4502
Hanover 14502 4502
Henrico 14502 4502
Henry 14502 4502
Highland 14501 4501
Isle of Wight 14502 4502
James City 14502 4502
King and Queen 14502 4502
King George 14501 4501
King William 14502 4502
Lancaster 14502 4502
Lee 14502 4502
Loudoun 14501 4501
Louisa 14502 4502
Lunenburg 14502 4502
Madison 14501 4501
Mathews 14502 4502
Mecklenburg 14502 4502
Middlesex 14502 4502
Montgomery 14502 4502
Nelson 14502 4502
New Kent 14502 4502
Northampton 14502 4502
Northumberland 14502 4502
Nottoway 14502 4502
Orange 14501 4501
Page 14501 4501
Patrick 14502 4502
Pittsylvania 14502 4502
Powhatan 14502 4502
Prince Edward 14502 4502
Prince George 14502 4502
Prince William 14501 4501
Pulaski 14502 4502
Rappahannock 14501 4501
Richmond 14502 4502
Roanoke 14502 4502
Rockbridge 14502 4502
Rockingham 14501 4501
Russell 14502 4502
Scott 14502 4502
Shenandoah 14501 4501
Smyth 14502 4502
Southampton 14502 4502
Spotsylvania 14501 4501
Stafford 14501 4501
Surry 14502 4502
Sussex 14502 4502
Tazewell 14502 4502
Warren 14501 4501
Washington 14502 4502
Westmoreland 14501 4501
Wise 14502 4502
Wythe 14502 4502
York 14502 4502
Alexandria 14501 4501
Bedford 14502 4502
Bristol 14502 4502
Buena Vista 14502 4502
Charlottesville 14502 4502
Chesapeake 14502 4502
Colonial Heights 14502 4502
Covington 14502 4502
Danville 14502 4502
Emporia 14502 4502
Fairfax 14501 4501
Falls Church 14501 4501
Franklin 14502 4502
Fredericksburg 14501 4501
Galax 14502 4502
Hampton 14502 4502
Harrisonburg 14501 4501
Hopewell 14502 4502
Lexington 14502 4502
Lynchburg 14502 4502
Manassas 14501 4501
Manassas Park 14501 4501
Martinsville 14502 4502
Newport News 14502 4502
Norfolk 14502 4502
Norton 14502 4502
Petersburg 14502 4502
Poquoson 14502 4502
Portsmouth 14502 4502
Radford 14502 4502
Richmond 14502 4502
Roanoke 14502 4502
Salem 14502 4502
Staunton 14501 4501
Suffolk 14502 4502
Virginia Beach 14502 4502
Waynesboro 14501 4501
Williamsburg 14502 4502
Winchester 14501 4501

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