SPCS2022 Zone Bounding Box Coordinates
Last Updated 6/1/2026

• Latitude and longitude bounding box coordinates were computed outward from the zone polygon to 0.01° precision using floor and ceiling functions.
• Min and max northings and eastings are based on projected bounding boxes to account for parallel curvature and meridian convergence and were computed outward to 100 m and 100 ift precision using floor and ceiling functions.
• District of Columbia zone bounding box is for entire metropolitan area.
• Negative northings in the GLA and GTXN zones are exceptions to SPCS2022 Policy made to accommodate design objectives for these zones.
• Per SPCS2022 Procedures, for zone abbreviations the state abbreviation can be separated from the zone part by a space or underscore. An underscore is used here to aid in filtering records.