Plumbing, heating & AC contractors in Illinois 4,280 establishments · 39,900 employees · 2024
Firms (IL)
4,280
Employment
39,900
Avg Annual Pay
$87,575
State Rank
#6 of 52
How Illinois compares to national
Metric
Illinois
National
Illinois vs. U.S.
Establishments
4,280
122,643
3.5% of U.S. total
Avg annual pay
$87,575
$78,183
+$9,392 (+12.0%)
Location quotient
1.06
1.00
6% denser than national
Avg firm size (employees)
9.3
10.5
—
Year-over-year firm growth
-0.1%
—
—
Reading this
An establishment is a single physical location where business is conducted. A firm with multiple locations counts as multiple establishments. "Avg pay" is wages and salaries per employee, including bonuses and tips — for proprietorships, the owner's take is largely outside this number. The location quotient (LQ) of 1.06 means plumbing, heating & ac contractors are 6% over-represented in Illinois's business mix relative to the U.S. average.
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Source. BLS Quarterly Census of Employment and Wages — 2024 annual averages, private-ownership only, NAICS 23822 (5-digit aggregation). Establishment counts include any firm with at least one paid employee covered by state unemployment insurance.
SMB Density · firm counts, employment, and wages by industry × state · data from BLS QCEW 2024 annual (private ownership, state-level; mostly 6-digit NAICS, 3 specialty-trade industries at 5-digit aggregation) · data.json