Professional, Scientific, and Technical Services in Illinois

Professional, Scientific, and Technical Services (NAICS 541) in Illinois reports 467,150 workers across 37,946 establishments, with $56.1B of aggregate annual payroll flowing through Census CBP 2023 filings. That represents 4.5% of national employment for this industry — a concentration ratio that tells you whether Illinois is a primary labor market for this NAICS code or a smaller satellite. A share above 5% signals a meaningful regional cluster; below 1% usually means the state is not a structural fit for this industry at scale.

Wage benchmarking is where state-level data earns its keep. The average annual compensation for Professional, Scientific, and Technical Services employees in Illinois is $120,096/yr, versus a national average of $107,141/yr. Illinois pays above the national average for this industry, which usually reflects higher skill concentration, union density, or regional cost of living.

Profitability data is only available at the national level because the IRS Statistics of Income program does not publish state-level margin breakdowns. The national net profit margin for Professional, Scientific, and Technical Services is not reported, and while margins do vary by state, the direction of variance usually follows labor cost and establishment size — both shown above. For a complete picture, pair this state-industry view with the Professional, Scientific, and Technical Services national page (entity structure, SBA lending, sub-industries) and the Illinois overview (top employers, payroll dispersion across industries).