DOI: 10.3886/icpsr09025.v1
title: County Boundaries of Selected United States Territories/States, 1790-1980
title: Version 1

description: 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.
description: Datasets: 
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]