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County Boundaries of Selected United States Territories/States, 1790-1980

Resource Type
Dataset : mapping data
  • Long, John H.
Other Title
  • Archival Version (Subtitle)
Publication Date
Funding Reference
  • National Endowment for the Humanities
Free Keywords
counties; computer aided mapping; computer programs; databases; geographic information systems; historical data; information systems; mapping
  • Abstract

    This cartographic database was created at the University of Wisconsin-Madison Cartographic Laboratory in conjunction with the Newberry Library and the National Endowment for the Humanities. The collection makes it possible to plot any or all of the territorial/state and county boundaries in the region covered by the states of North and South Dakota, Minnesota, Iowa, Missouri, Wisconsin, Illinois, Michigan, Indiana, Ohio, Pennsylvania, New Jersey, Maryland, and Delaware. The data collection also contains the county names, the names and locations of the corresponding capitals and county seats, and information on the shoreline along the Great Lakes and the Atlantic Ocean. All changes in lines, locations, and names are dated to the day according to their legally effective dates. The data collection consists of 38 data files. Part 1 contains all of the cartesian coordinates (in digitizer units) required to define the historical county boundaries for those 14 states. Part 2 contains the "control" needed to convert digitizer units into latitude and longitude. The remaining 36 files contain all of the descriptive information needed to build the appropriate cartographic base for any given date.
  • Table of Contents


    • DS0: Study-Level Files
    • DS1: Map Information/DBGEN File [MPDBRNGS]
    • DS2: DBGEN/Coordinate File [DBCOORDXY]
    • DS3: Datesfile: Maryland, Delaware, and Pennsylvania [MDDLPA46]
    • DS4: Datesfile: New Jersey [NJ46]
    • DS5: Datesfile (County Seats): Maryland, Delaware, Pennsylvania, and New Jersey [NAME46]
    • DS6: State Codes [NMSTATES]
    • DS7: City Codes [CTYNMS]
    • DS8: Datesfile: Ohio, Part I [DTOHIO1]
    • DS9: Datesfile: Ohio, Part II [DTOHIO2]
    • DS10: Datesfile (County Seats): Ohio [NMOHIO]
    • DS11: Datesfile: Indiana [DTINDN]
    • DS12: Datesfile (County Seats): Indiana [NMINDIANA]
    • DS13: Datesfile: Illinois [DTILL]
    • DS14: Datesfile (County Seats): Illinois [NMILL]
    • DS15: Datesfile: Wisconsin [DTWISC]
    • DS16: Datesfile (County Seats): Wisconsin [NMWISC]
    • DS17: Datesfile: Michigan [DTMICH]
    • DS18: Datesfile (County Seats): Michigan [NMMICH]
    • DS19: Datesfile: Minnesota [DTMN]
    • DS20: Datesfile (County Seats): Minnesota [NMMN]
    • DS21: Datesfile: Iowa [DTIA]
    • DS22: Datesfile (County Seats): Iowa [MNIA]
    • DS23: Datesfile: Missouri [DTMO]
    • DS24: Datesfile (County Seats): Missouri [NMMO]
    • DS25: Datesfile: North Dakota [DTND]
    • DS26: Datesfile (County Seats): North Dakota [NMND]
    • DS27: Datesfile: South Dakota [DTSD]
    • DS28: Datesfile (County Seats): South Dakota [NMSD]
    • DS29: Datesfile: Northwest Territory [DT60]
    • DS30: Datesfile: Ohio, Illinois Territory, and Indiana Territory [DT3958]
    • DS31: Datesfile: Illinois, Indiana, and Ohio [DT1739]
    • DS32: Datesfile: Michigan Territory [DT59]
    • DS33: Datesfile: Illinois, Wisconsin Territory, and Michigan Territory [DT1759]
    • DS34: Datesfile: Michigan and Wisconsin Territory [DT2661]
    • DS35: Datesfile: Michigan and Wisconsin [DT2655]
    • DS36: Datesfile: Iowa, Missouri, and Iowa Territory [DT1963]
    • DS37: Datesfile: Iowa, Missouri, and Iowa Territory [DT1963A]
    • DS38: Datesfile: Minnesota, Dakota Territory, and Minnesota Territory [DT2767]
    • DS39: Datesfile: Minnesota, Dakota Territory, and Minnesota Territory [DT2767A]
    • DS40: Datesfile: Minnesota, North Dakota, and South Dakota [DT2746]
Temporal Coverage
  • 1790 / 1980
    Time period: 1790--1980
  • 1975 / 1981
    Collection date: 1975--1981
Geographic Coverage
  • Delaware
  • Illinois
  • Indiana
  • Iowa
  • Maryland
  • Michigan
  • Minnesota
  • Missouri
  • New Jersey
  • North Dakota
  • Ohio
  • Pennsylvania
  • South Dakota
  • United States
  • Wisconsin
2006-01-12 All files were removed from dataset 41 and flagged as study-level files, so that they will accompany all downloads.2006-01-12 All files were removed from dataset 41 and flagged as study-level files, so that they will accompany all downloads. Funding insitution(s): National Endowment for the Humanities.
This version of the study is no longer available on the web. If you need to acquire this version of the data, you have to contact ICPSR User Support (
Alternative Identifiers
  • 9025 (Type: ICPSR Study Number)
  • Is previous version of
    DOI: 10.3886/ICPSR09025.v1
  • Long, John H.. Historical Atlas and Chronology of County Boundaries, 1788-1980 [vols. 1-5]. Boston: G.K. Hall. 1984.
  • Long, John H.. Historical boundary data file. Mapline.3, 1979.
  • Basoglu, Umit, Morrison, Joel L.. An efficient hierarchical data structure for the United States Historical County Boundary data file. Harvard Papers on Geographic Information Systems.Reading: Addison-Wesley. 1978.

Update Metadata: 2015-08-05 | Issue Number: 6 | Registration Date: 2015-06-15

Long, John H. (1985): County Boundaries of Selected United States Territories/States, 1790-1980. Archival Version. Version: v0. ICPSR - Interuniversity Consortium for Political and Social Research. Dataset.