Longitudinal Employer-Household Dynamics (LEHD)
Overview: Overview: Longitudinal Employer–Household Dynamics (LEHD) data are the result of a partnership
between the Census Bureau and U.S. states to provide high quality local labor market
information and to improve the Census Bureau’s economic and demographic data programs.
LEHD data are based on different administrative sources, primarily Unemployment Insurance
(UI) earnings data and the Quarterly Census of Employment and Wages (QCEW), and censuses
and surveys. Firm and worker information are combined to create job level quarterly earnings
history data, data on where workers live and work, and data on firm characteristics, such as industry.
Access to these data will only be granted to qualified researchers on approved projects
with authorization to use specific data sets. All researcher access to restricted–use data occurs at
one of the secure Census Research Data Centers (RDCs). The table below lists person, job and
establishment based data available at the RDCs.
All LEHD data files except the Business Register Bridge are by state. A subset of states have data
available at the RDCs. The list of states can be found on page 15 of LEHD Infrastructure Files
in the Census RDC - Overview. This document provides detailed information about the LEHD
data. In general, LEHD data are available from 2000 onwards. The availability of historical data
prior to 2000 varies by state and data set. In the Years column of the table below, the start year
is the year in which the state(s) with the earliest data has (have) data available for that data set.
The latest year of data available at the RDCs is 2008. Some LEHD data contain Federal Tax Information
(FTI). Use of LEHD data containing FTI requires approval by the Internal Revenue
Service (IRS).
In addition to the restricted-use data available at the RDCs, LEHD creates public-use data sets
and online tools. Quarterly Workforce Indicators (QWI) data and the online tools QWI Online
and Industry Focus contain workforce statistics by demography, geography, and industry for
each state. OnTheMap data and the OnTheMap web application have partially synthetic data on
where workers live and work. These data and online tools have statistics for quarters up to about
one year ago and include data for all states that have joined the LED Partnership.
View the Longitudinal Employer-Household Dynamics