Important Information

Annual Revisions

Each year, historical estimates from the Local Area Unemployment Statistics (LAUS) program are revised to reflect new population controls from the Census Bureau, updated input data, and reestimation. The data for model-based areas also incorporate new seasonal adjustment, and the unadjusted estimates are controlled to new census division and U.S. totals. Substate area data subsequently are revised to incorporate updated inputs, reestimation, and controlling to new statewide totals.

Model-Based Areas

In conjunction with the current revision cycle, LAUS is undergoing a broad program redesign. The first phase of this redesign occurred on March 4, 2015, with the comprehensive replacement of data for census regions and divisions, the states and the District of Columbia, and a handful of large substate and balance-of-state areas based on a new generation of time-series models. The substate model-based areas are as follows: the Los Angeles-Long Beach-Glendale, CA Metropolitan Division; the Miami-Miami Beach-Kendall, FL Metropolitan Division; the Chicago-Naperville-Arlington Heights, IL Metropolitan Division; the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area; New York city, NY; the Cleveland-Elyria, OH Metropolitan Statistical Area; and the Seattle-Bellevue-Everett, WA Metropolitan Division. The metropolitan areas and metropolitan divisions reflect the 2010 Census-based delineations issued by the Office of Management and Budget (OMB) in February 2013. Both not-seasonally-adjusted (NSA) and smoothed-seasonally-adjusted (SSA) and data were replaced back to their series beginnings in 1976, 1990, or 1994. Information on the new models is available in the Report on Revision to State and Area Time-Series Models.

Statewide data for Puerto Rico (both NSA and SSA) were revised on March 17 from January 2010 forward to reflect updated population controls. The NSA data for Puerto Rico are tabulated from a household survey similar to the Current Population Survey and generally are not subject to historical revision like the model-based estimates for states.

Substate Areas

On March 17, substate estimates from January 1990 through December 2014 were controlled to the new NSA totals for model-based areas. At the same time, the federal statistical area geography was converted to the 2010 Census-based delineations that had been issued by OMB in February 2013. (More information on the new federal statistical areas is available at The substate data from January 2010 through December 2014 are provisional as of March 17, and are footnoted in the BLS time-series database to indicate this. Comprehensive revisions for substate areas from January 2010 forward will be issued on April 21, reflecting methodological enhancements and the use of more timely estimation inputs from the Census Bureau's American Community Survey. (More information on the upcoming revisions to substate estimates is available at Also on April 21, annual average estimates for substate areas in 2014 will be issued.


On March 17, minor corrections were made to smoothed-seasonally-adjusted data for Puerto Rico (available directly at from January 1976 through December 2009. Changes to these data outside of the standard 5-year scope for re-adjustment had been issued on March 4. The corrections restore the historical data that had been overwritten inadvertently at that time.


Last Modified Date: March 17, 2015