Limited English Proficiency (LEP): A Federal Interagency Website
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Updated: July 2, 2014



Demographic Data

A federally conducted or funded program should consider assessing the number or proportion of limited English proficient (LEP) persons from each language group in its service area to determine appropriate language assistance services. Below are federal government and non-governmental sources of language data that can assist in assessing the LEP communities in your service area. These are a sampling of the resources that may be useful and are not necessarily endorsed by the Department of Justice or by the Federal Interagency Working Group on LEP.

Federal Government and Non-Government Demographic Data
Data Available
Related Resources
U.S. Census Bureau American Community Survey (ACS) Language Map based on 2007-2011, Language Data
    ACS, 2006-2010 5-Year Language Estimates
  American Factfinder
  Decennial Census

Decennial Data on Language Use

U.S. Department of Education National Center for Education Statistics (NCES) Build a Table: ELL / LEP Students by State
  Fast Facts

Children Who Speak a Language Other Than English at Home

Social Security Administartion Social Security Data for Asian and Pacific Islander Language Preferences


U.S. Department of Labor 2000 U.S. Census Special Tabulation on LEP Status Evaluation of LEP and Hispanic Worker Initiative (2010)
Centers for Disease Control and Prevention Snap Shots of State Population Data (Top Five Languages)  
Data Available
Related Resources
Migration Policy Institute (MPI) Limited English Proficient Individuals in the United States: Linguistic Diversity at the County Level (February 2013) (Excel)

Limited English Proficient Population of the United States (July 2013)


Limited English Proficient Individuals in the United States: Number, Share, Growth, and Linguistic Diversity (December 2011) (PDF)

Growth of LEP Population in U.S., 1990 to 2010 (Excel)

Top 5 Language Spoken by LEP Individuals in 50 States (Excel)

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