Mechanical Engineer.
St. Louis.
$81,000
median salary, 10% below the national average
$63,000 to $106,000. Updated for 2026.
The numbers.
Everything you need to negotiate with confidence.
St. Louis is 10% cheaper than the national average. For Mechanical Engineers, that shakes out to a median of $81,000, with the full range spanning $63,000 to $106,000. Industry placement creates the widest pay gaps, with automotive, aerospace, and energy sector roles paying 15 to 30% more than HVAC or consumer products. Know the range before you walk in.
Salary range
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How St. Louis compares
St. Louis, MO
$81,000
Cost of living: 10% below average
National Average
$90,000
St. Louis is $9,000 below
What you should know
Here is what the Mechanical Engineer market actually looks like in St. Louis. St. Louis offers one of the most affordable major metro areas in the country, with a strong base in healthcare, financial services, and manufacturing. The region's anchor employers include Boeing, Centene, and Washington University's medical campus. A growing biotech and plant sciences corridor centered on the Cortex Innovation District is attracting new investment and talent. Industry placement creates the widest pay gaps, with automotive, aerospace, and energy sector roles paying 15 to 30% more than HVAC or consumer products. CAD/CAE proficiency, FEA simulation skills, and experience with additive manufacturing or robotics integration command premiums in the current market.
Entry-level mechanical engineers start at $70,000 to $82,000. Senior engineers earn $90,000 to $118,000 after five to seven years. Engineering managers reach $120,000 to $155,000, with directors at large manufacturers earning $160,000 to $200,000. In St. Louis, cost of living sits near the national average, so the numbers you see are roughly what you keep.
Base salary is not the full picture. Manufacturing firms offer bonuses of 5 to 12% tied to project milestones and cost savings. Automotive OEMs include profit-sharing of $3,000 to $12,000 annually. Many employers provide PE exam support and professional society membership fees. And on the tax side: missouri's top income tax rate is about 4.8%, and St. Louis City adds a 1% earnings tax. The low base cost of living means your after tax salary still stretches further than in most metros. When someone quotes you $81,000, ask what the total package looks like. The gap between base and total comp is where real money hides.
On negotiation: Emphasize your willingness to work in person at Cortex or the BJC campus. St. Louis employers offer higher packages for candidates who commit to the local innovation hubs. The range for Mechanical Engineers in St. Louis runs from $63,000 to $106,000. That is not a narrow window. Where you land inside it depends almost entirely on whether you negotiate and how well you prepare.
Top industries in St. Louis
Negotiating in St. Louis
Emphasize your willingness to work in person at Cortex or the BJC campus. St. Louis employers offer higher packages for candidates who commit to the local innovation hubs.