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|Census 2000 Gateway | Glossary|
County-to-County Migration Flow Files
These migration data come from the Census 2000 long-form question on residence 5 years ago and contain the number of people who moved between counties.1 A data record was produced for every combination of county-to-county migration flows in the United States of at least one person between 1995 and 2000.2 Current county of residence is based on where the person was living on April 1st, 2000. Previous county of residence is based on where the person was living 5 years earlier.
The files come in two formats (excel and text) and are sorted separately by inmigrants to the state/county (inflows) and outmigrants from the state/county (outflows).
There are two excel files for each of the 50 states and the District of Columbia, making a total of 102 files.
For each county in the state, the number of migrants who moved to that county from another county is listed. These files contain records for FIPS state code in 2000, FIPS county code in 2000, county and state name in 2000 (current residence), FIPS state code in 1995, FIPS county code in 1995, county and state name in 1995 (previous residence), and the number of migrants who moved between those two counties (inflow).
For each county in the state, the number of migrants who moved away from that county to another county is listed. These files contain records for FIPS state code in 1995, FIPS county code in 1995, county and state name in 1995 (previous residence), FIPS state code in 2000, FIPS county code in 2000, county and state name in 2000 (current residence), and the number of migrants who moved between those two counties (outflow).
There are two text files; one for inflows from every county in the United States and another resorted by outflows to every county in the United States. Each text file contains data for all 50 states and the District of Columbia, sorted by FIPS state/county codes.
The inflow file contains FIPS codes of current residence (in 2000) and previous residence (in 1995), as well as the number of migrants who moved between those two counties (flow).
The outflow file contains FIPS codes of previous residence (in 1995) and current residence (in 2000), as well as the number of migrants who moved between those two counties (flow).
Record Layout for Inflow Text File
|1-5||CURFIPS||FIPS State/County code of residence in 2000|
|7-11||PREFIPS||FIPS State/County code of residence in 1995|
|13-18||FLOW||Number of inmigrants to county of residence in 2000 from county of residence in 1995.|
Record Layout for Outflow Text File
|1-5||PREFIPS||FIPS State/County code of residence in 1995|
|7-11||CURFIPS||FIPS State/County code of residence in 2000|
|13-18||FLOW||Number of outmigrants from county of residence in 1995 to county of residence in 2000.|
Note: Counties and independent cities in Virginia were combined as follows:
Albemarle County and Charlottesville city
Alleghany County, Clifton Forge city, and Covington city
Arlington County and Alexandria city
Augusta County, Staunton city, and Waynesboro city
Bedford County and Bedford city
Campbell County and Lynchburg city
Chesapeake city, Norfolk city, and Portsmouth city
Dinwiddie County and Petersburg city
Fairfax County, Fairfax city, and Falls Church city
Frederick County and Winchester city
Grayson County and Galax city
Greensville County and Emporia city
Henrico County and Richmond city
Henry County and Martinsville city
James City County and Williamsburg city
Montgomery County and Radford city
Pittsylvania County and Danville city
Prince George County and Hopewell city
Prince William County, Manassas city, and Manassas Park city
Roanoke County, Roanoke city, and Salem city
Rockbridge County, Buena Vista city, and Lexington city
Rockingham County and Harrisonburg city
Southampton County and Franklin city
Spotsylvania County and Fredericksburg city
Washington County and Bristol city
Wise County and Norton city
York County and Poquoson city
The independent cities of Colonial Heights, Hampton, Newport News, Suffolk, and Virginia Beach were not combined with counties.
1 These data come from a sample. For information on confidentiality, protection, sampling error, nonsampling error, and definitions, see www.census.gov/prod/cen2000/doc/sf3.pdf.
2 Most independent cities in Virginia were combined with an adjacent or surrounding county. See endnote for details.
|Inflow Files||Outflow Files||States|
|Part 1 (15.6 M)||Part 1 (16.9 M)||Alabama through Florida|
|Part 2 (18.9 M)||Part 2 (18.7 M)||Georgia through Maine|
|Part 3 (15.4 M)||Part 3 (14.4 M)||Maryland through New Hampshire|
|Part 4 (18.3 M)||Part 4 (19.1 M)||New Jersey through Rhode Island|
|Part 5 (21.5 M)||Part 5 (20.7 M)||South Carolina through Wyoming|
|Inflow File (14.0 M)|
|Outflow File (14.0 M)|