This working paper accompanies the release of the County-to-County and County/Minor Civil Division (MCD)-to-County/MCD files, which use data collected by the American Community Survey (ACS) from 2005 through 2009. Historically, the Census Bureau has released migration flow products going back to the 1940 Census, the first year a previous residence question was asked on the Decennial Census. County/MCD-to-county/MCD files were produced from the 1980, 1990, and 2000 Census data. Prior to the release of this set of flow products, the only ACS migration flow tables available were for state-to-state flows.

Table Notes

Sample size and data quality measures (including coverage rates, allocation rates, and response rates) can be found on the American Community Survey website in the Methodology section.

Data are based on a sample and are subject to sampling variability. The degree of uncertainty for an estimate arising from sampling variability is represented through the use of a margin of error. The value shown here is the 90 percent margin of error. The margin of error can be interpreted roughly as providing a 90 percent probability that the interval defined by the estimate minus the margin of error and the estimate plus the margin of error (the lower and upper confidence bounds) contains the true value. In addition to sampling variability, the ACS estimates are subject to nonsampling error (for a discussion of nonsampling variability, see Accuracy of the Data). The effect of nonsampling error is not represented in these tables.

Research & Methodology

Discover how the ACS produces reliable statistics for communities, how the quality is measured, and what the quality measures mean.

Code Lists, Definitions, and Accuracy

View the detailed codes and definitions for variables, statistical testing, and an explanation of sample design, methodology, and accuracy for the ACS.

User Notes for this data

ACS Migration Flow User Note: Omission of MCD Flows 2009 5-year ACS

2009

The 2005-2009 5-year Migration Flow tables, March 28, 2012, don’t included records for movers among minor civil divisions within the same county.

Others in Series

Working Paper

SNAP Misreporting on the CPS: Does it Affect Poverty Estimates?

September 01, 2011

Paper examines the misreporting of nutritional assistance on the CPS received by Supplement Nutrition Assistance Program (SNAP), formerly known as food stamps.

Working Paper

Measurement of High School Equivalency Credentials

February 2012

This paper outlines the ways that the Census Bureau captures persons with alternative high school credentials.

Working Paper

Eval. of Gross Vacancy Rates From the 2010 Census vs Current Surveys

April 2012

Research completed to date on factors that might explain differences in the level of vacant and occupied housing units between the 2010 Census and 2010 ACS.

Related Information

Migration/Geographic Mobility Working Papers

Page Last Revised - October 8, 2021

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