Atlas of Historical County Boundaries
SUMMARY METADATA: U.S. Historical Counties
After ECAIís model, based upon Dublin Core
Connection Information
DatasetTitle U.S. Historical Counties
DatasetType vector digital data
ServerType W2K, IIS 5.0, ArcIMS 9.x,Tomcat 5.0
CreationDate 2011
LastUpdated 2011-10-01
Descriptive Metadata
Title U.S. Historical Counties
Citation.PreferredStyle Siczewicz, Peter. U.S. Historical Counties. Dataset. Emily Kelley, digital comp. Atlas of Historical County Boundaries, ed. by John H. Long. Chicago: The Newberry Library, 2011. Available online from
Creator.PersonalName Siczewicz, Peter, digital compiler.
Subject United States Historical County Boundaries.
Description This compilation, a single, national-level synthesis in shapefile format of all changes in the size, shape, and location of every county in the U.S. (and their equivalents), from the creation of the first county in 1629 to 2000, provides a separate nationwide set of polygons for each date when a mappable boundary change occurred; changes dated to the day. Shapefiles are complemented by an attribute table with supporting information. The data are in the WGS84 geographic coordinate system.
Publisher The Newberry Library
Contributor.PersonalName Kelley, Emily, digital compiler
Contributor.PersonalName Long, John H., editor
Date 2011
Type Dataset
Format Shapefile
Format.Size 17727 polygons, 751.427 MB
Source Relevant elements from the fifty state-level shapefile datasets of the Atlas of Historical County Boundaries were combined to make a nationwide shapefile. Also see the supporting materials with each state dataset.
Language eng
Coverage.WestBoundingCoordinate -179.147355
Coverage.EastBoundingCoordinate -66.949425
Coverage.NorthBoundingCoordinate 71.389612
Coverage.SouthBoundingCoordinate 18.910845
Coverage.t.early 1629-03-04
Coverage.t.late 2000-12-31
Coverage.PlaceName United States of America
Coverage.SpatialResolution 1:100,000
Coverage.Spatial.Georeference County
Coverage.Temporal.Interval 1 day
Coverage.AlternativeMetadata Full FGDC Metadata is also available.
Rights Free access/download and use under Attribution-NonCommercial-ShareAlike Creative Commons License (