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Research Guides@Tufts

Social Science Data and Statistics Resources


Immigration data varies widely depending on the research question. If working with a small population or a population defined by characteristics that aren't gathered in the census (religion or child of immigrants, for example), consider looking for researcher-gathered data that intentionally over-samples that group, rather than a nationally representative sample. ICPSR is an excellent source for this. Contact your librarian for more support. 

Stock Data

Stock data is used to estimate the number of individuals of a certain population of interest at a specific point in time.

For example: The number of naturalized Colombian immigrants residing in the U.S as of July 2013.


Sources of Stock data

Source About Coverage/Frequency Access
American Community Survey (ACS) Replaced the Decennial Census long form in 2000. Since 2007 you can find the ACS with multiyear sampling estimates. More information 2000-Present; every year

American Fact Finder


Decennial Census Composed of short form (basic) and long form (socio-economic). Long form replaced by ACS in 2010 1850-2010; every ten years

American Fact Finder


IPUMS Microdata prepared by Dr.Marrow
Estimates of the Unauthorized Immigrant Population Resident in the United States: January 2012- Department of Homeland Security (DHS) Report providing estimates of the size of the unauthorized immigrant population residing in the U.S 2000-2012

Department of Homeland Security


Department of Homeland Security report on 'Estimates of Unauthorized Immigration Population living in the United States: January 2011'.

Instructions and video on using IPUMS online analysis tool

Flow Data

Flow data is an estimate of change (addition/subtraction) of a population of interest at a specified period of time.

For example: The estimate of the number of persons arriving to the U.S from Vietnam for the years of 1965-1975.

Sources of Flow Data

Source About Coverage/Frequency Access

Yearbook of Immigration Statistics- Department of Homeland Security (DHS)

Admissions on permanent basis, temporary basis, aylum or refugee status, naturalizations. Replaced the functions of the INS in 2001. 2002-Present; Every fiscal year

Department of Homeland Security

Statistical Yearbook of the Immigration and Naturalization Service (INS) Admissions on permanent basis, temporary basis, aylum or refugee status, naturalizations. Pre-DHS.  1996-2001; Every fiscal year

Department of Homeland Security Archives
-- [physical copies digitized] 1978,1980-1984,1987, 1995, 1997, 1998 HathiTrust Digital Library
-- [microfiche] 1983, 1987-1999 Tisch Library Microform. Sudoc number: J 21.2/10

Additional Data Sources

Forced Migration and Slavery