Release: Net Migration Flows for Counties and County Equivalents in the United States
Link: https://alfred.stlouisfed.org/release?rid=399

ALFRED (ArchivaL Federal Reserve Economic Data)
Economic Research Division
Federal Reserve Bank of St. Louis

File Created: 2024-05-21 8:35 AM CDT

                                                                               Release Dates      
Name                                                                        Start         End     
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Net Migration Flows for Counties and County Equivalents in the United     2017-03-12   2023-01-26 
States                                                                

Link
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https://www.census.gov/topics/population/migration/guidance/county-to-    2017-03-12   2023-01-26 

Source
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U.S. Census Bureau                                                        2017-03-12   2023-01-26 

Notes
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The American Community Survey (ACS) and the Puerto Rico Community         2017-03-12   2023-01-26 
Survey (PRCS) asked members of households 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.                                                         
                                                                      
Multiyear estimates from the American Community Survey (ACS) are      
"period" estimates derived from a data sample collected over a period 
of time, as opposed to "point-in-time" estimates such as those from   
past decennial censuses. ACS 5-year estimate includes data collected  
over a 60-month period. The date of the data is the end of the 5-year 
period. For example, a value dated 2014 represents data from 2010 to  
2014. However, they  do  not  describe  any  specific day, month, or  
year within that time period.                                         
                                                                      
Multiyear  estimates  require  some  considerations  that  single-year
 estimates  do  not.  For  example,  multiyear  estimates released in 
consecutive years consist mostly of overlapping years and shared data.
The 2010–2014 ACS 5-year estimates share sample data from 2011      
through 2014 with the 2011–2015 ACS 5-year estimates. Because of    
this overlap, users should use extreme caution in making comparisons  
with consecutive years of multiyear estimates.                        
                                                                      
Please see "Section 3: Understanding and Using ACS Single-Year and    
Multiyear Estimates" on publication page 13 (file page 19) of the 2018
ACS General Handbook for a more thorough clarification.               
https://www.census.gov/content/dam/Census/library/publications/2018/ac


Release Dates Notes:

Release dates are determined by the following process:

When available, the actual release date as provided by the source is
entered into the ALFRED database.  If a release date is not available
from the source, the release date given by our data providers is used.
 If a release date cannot be determined either from the source or from
our data providers, the date that the series was first available in
the St. Louis Fed's FRED database is used.

The release date list contains the dates when any series from this
release was revised.  Note that all series from a release do not
necessarily revise on every release date.

Release Dates:

2017-03-12
2017-08-10
2018-11-27
2019-08-29
2020-09-03
2021-09-01
2023-01-26