Federal Reserve Economic Data

Table Data - Net County-to-County Migration Flow (5-year estimate) for Montgomery County, MD (DISCONTINUED)

Title Net County-to-County Migration Flow (5-year estimate) for Montgomery County, MD (DISCONTINUED)
Series ID NETMIGNACS024031
Source U.S. Census Bureau
Release Net Migration Flows for Counties and County Equivalents in the United States
Seasonal Adjustment Not Seasonally Adjusted
Frequency Annual
Units Persons
Date Range 2009-01-01 to 2020-01-01
Last Updated 2023-04-03 2:24 PM CDT
Notes 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. The 5-year dataset is used for the county-to-county migration flows since many counties have a population less than 20,000. 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.
DATE VALUE
2009-01-01 6007
2010-01-01 5296
2011-01-01 -5256
2012-01-01 -2013
2013-01-01 -2750
2014-01-01 -3503
2015-01-01 -5052
2016-01-01 -5044
2017-01-01 -7780
2018-01-01 -11032
2019-01-01 -8129
2020-01-01 -8901

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