Observations

Q1 2026: 135.787

Updated: Jun 25, 2026 10:21 AM CDT

Units:

Index 2017=100,

Seasonally Adjusted

Frequency:

Quarterly

Notes

Title	Release Dates

Quantity Indexes for Real Gross Domestic Product by Industry: Private Industries: Professional and Business Services: Professional, Scientific, and Technical Services for Illinois	2016-07-27	2021-06-21
Chain-Type Quantity Index for Real GDP: Professional, Scientific, and Technical Services (NAICS 54) in Illinois	2021-06-22	2023-12-04
Chain-Type Quantity Index for Real GDP: Professional, Scientific, and Technical Services (54) in Illinois	2023-12-05	2026-06-25

Source

U.S. Bureau of Economic Analysis	2016-07-27	2026-06-25

Release

Gross Domestic Product (GDP) by State	2016-07-27	2021-02-15
Gross Domestic Product by State	2021-02-16	2026-06-25

Units

Index 2009=100	2016-07-27	2018-11-13
Index 2012=100	2018-11-14	2023-12-04
Index 2017=100	2023-12-05	2026-06-25

Frequency

Quarterly	2016-07-27	2026-06-25

Seasonal Adjustment

Seasonally Adjusted	2016-07-27	2026-06-25

Notes

For more information about this release go to http://www.bea.gov/newsreleases/regional/gdp_state/qgsp_newsrelease.htm.	2016-07-27	2021-06-21
Information about this release can be found here (https://www.bea.gov/data/gdp/gdp-state). For information about BEA industries and other regional definitions, visit their Regional Economic Accounts: Regional Definitions website (https://apps.bea.gov/regional/definitions/).	2021-06-22	2026-06-25

Chain-Type Quantity Index for Real GDP: Professional, Scientific, and Technical Services (54) in Illinois (ILPROBUSQQGSP)