The American Community Survey (ACS) and the Puerto Rico Community Survey (PRCS) ask respondents age 1 year and over whether they lived in the same residence 1 year ago. For people who lived in a different residence, the location of their previous residence is collected.
ACS uses a series of monthly samples to produce estimates. Estimates for geographies of population 65,000 or greater are published annually using these monthly samples. Three years of monthly samples are needed to publish estimates for geographies of 20,000 or greater and five years for smaller geographies. The 5-year dataset is used for the county-to-county migration flows since many counties have a population less than 20,000. The first 5-year ACS dataset covers the years 2005 through 2009.
In addition to the county-to-county flow files, there are similar files that substitute minor civil divisions (mcd), in place of counties, for states where they serve as general-purpose local governments. These states are Connecticut, Maine, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, and Wisconsin.
Starting with the 2009-2013 5-year products, additional metropolitan statistical area-to-metropolitan statistical area tables are included.
County-to-County Migration Flows: 2011-2015 ACS
These tables are based on the 2011-2015 ACS release crossed by sex, age, race and Hispanic or Latino Origin.
County-to-County Migration Flows: 2010-2014 ACS
These tables are based on the 2010-2014 ACS release crossed by relationship, household type, and tenure.
County-to-County Migration Flows: 2009-2013 ACS
This page contains tables related to the ACS county-to-county migration information during 2009-2013.
County-to-County Migration Flows: 2008-2012 ACS
This page contains tables related to the ACS county-to-county migration information during 2008-2012.
County-to-County Migration Flows: 2007-2011 ACS
This page contains tables related to the ACS county-to-county migration information during 2007-2011.
County-to-County Migration Flows: 2006-2010 ACS
This page contains tables related to the ACS county-to-county migration information during 2006-2010.
Census Flows Mapper: The Census Flows Mapper is an interactive, mapping application for the public to visualize and print, as well as download county-to-county flows. In the application, users select a county either by scrolling over it and clicking on the map or via drop-down menus. By default map will display net county-to-county flows into and out of the selected county. County-to-county flows may also be crossed by characteristics such as sex, race, Hispanic origin, and age. A PowerPoint Tutorial for the tables and Census Flows Mapper is available.
Census Flows Mapper
The Census Flows Mapper is a web mapping application intended to provide users with a simple interface to view, save and print migration flows maps.
American Community Survey Migration Flows
Migration flows between counties, minor civil divisions, and metropolitan areas using ACS 5-year data. Flows are crossed by selected characteristics.
Overestimate of Domestic Migration for Alaska in ACS Prior to 2015
Overestimate of Domestic Outmigration for Alaska in the American Community Survey Prior to 2015. Description and related fixes.
Comparing ACS Data
Learn more about comparing the current American Community Survey estimates with the previous year, 2010 Census, and 2000 Census by topic.
ACS Census Flows Mapper Tutorial
PowerPoint Slides highlighting new features in the November 2016 version of Census Flows Mapper.
Inmigration and outmigration data are available for published geographies in data.census.gov. Detailed tables B07001 through B07013 contain geographical mobility in the past year for current residence by selected characteristics for all summary levels. The data are separated into five geographical mobility categories: Nonmovers, movers within the same county, movers from a different county within the same state, movers from a different state, and movers from abroad. Detailed tables B07401 through B07413 contain geographical mobility in the past year for residence 1 year ago by selected categories for some summary levels. The data are separated into four categories: Nonmovers, movers within the same county, movers to a different county within the same state, and movers to a different state. Tables dealing specifically for Puerto Rico have a -PR suffix and slightly different geographical mobility categories.
The Population Estimates Program publishes annual population estimates using various administrative and survey data. The program produces population, population change, and estimated components of change files for the nation, states, counties, metropolitan and micropolitan areas, and combined statistical areas as part of the datasets available for download. The files contain estimates for net internal and net international migration.
Annual estimates for the U.S., states, counties, cities, etc. Components of population change (births, deaths and migration) for U.S., states and counties.
County-to-County Migration Flows Files: Census 2000
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.
State-to-State Migration Flows
This page gives background information for the ACS state-to-state migration flow products.