Businesses in Michigan: 229,564 workplaces, the big headquarters and how to find the rest

This page is for anyone looking for Michigan businesses: suppliers hunting for buyers, job seekers, researchers sizing a market and B2B sellers building territory lists. It starts with how many businesses there are and what they do, then the big headquarters and private companies, and ends with how to check a business and how to prospect the state's factories.

How many businesses are in Michigan

The US Census Bureau's County Business Patterns (CBP) counts every business location with paid employees. For Michigan in 2023:

In bands: 194,000 establishments with 1 to 19 employees, 29,581 with 20 to 99 and 5,983 with 100 or more. Just over half of all Michigan workplaces have fewer than five employees.

These are establishments, not companies: a bank with 80 branches counts 80 times. CBP covers all industries (the "total for all sectors" line), leaves out the self-employed and businesses with no employees, and measures employment in the pay period including March 12, 2023. The number of registered businesses in Michigan is much higher.

What Michigan businesses do

Average pay and employees per site are our calculations from CBP payroll and counts. Manufacturing is only ninth by number of establishments but second by jobs: its 604,978 employees are 15.0% of Michigan's CBP total, against 8.8% across the US. That one fact shapes most selling in the state. Plants are few, large and buy steadily, and much of the professional services, staffing and wholesale activity around them exists to supply them.

Where Michigan businesses are

Oakland, Wayne and Macomb, the three core Detroit counties, hold 40.5% of the state's establishments. Oakland, the suburban county north of Detroit, has the most, and Kent County (Grand Rapids) has the highest employees per site of the ten at 21.6, a sign of its manufacturing base. The Census Bureau flags Washtenaw's employment figure as moderately affected by the noise it adds to protect confidentiality. For city-level detail, see businesses in Detroit and Grand Rapids.

The biggest companies headquartered in Michigan

The ten largest SEC-listed companies whose latest 10-K gives a Michigan principal executive office, by revenue in that filing (all for the year to December 2025):

Five of the ten are automotive. The full ranking of 25, with headcounts and the companies that lists often count as Michigan's but whose filings say otherwise, is on our largest companies in Michigan page.

Large private companies and big employers

Private companies don't file 10-Ks, so they need a published list. The Detroit Regional Chamber republishes Crain's Detroit Business's 2025 ranking of the region's largest private companies by 2024 revenue. The top five are Penske Corp. of Bloomfield Hills ($44.0 billion), Atlas Oil of Taylor ($7.7 billion), Walbridge of Detroit ($5.9 billion), Ilitch Holdings of Detroit ($5.1 billion) and Barton Malow of Southfield ($4.5 billion).

For headcount, the Detroit Regional Partnership, the 11-county region's economic development organization, lists its major employers. The page doesn't date its figures, so treat them as indicative:

Three of the seven are hospital systems. Stellantis, whose brands include Jeep, Chrysler, Dodge and Ram, is the region's fourth-largest employer on this list but files its annual report as a Dutch company, so it never appears in a ranking of Michigan headquarters.

How to look up or check a Michigan business

To vet a supplier or contractor, confirm its entity is active with LARA, check any trade license it needs, then ask for references from companies your size in the same county.

Prospecting Michigan's factories

The state's 12,192 manufacturing establishments are the clearest target for anyone selling equipment, consumables, maintenance, safety, logistics or engineering services. Three things help:

1. Pick counties by plant density, not population. Kent has 1,113 manufacturing establishments with 70,021 employees; Ottawa has 601 with 39,492.
2. Size by site, not by company. A Tier 1 supplier's plant manager often controls spending on consumables and services for that building, whatever the parent's size.
3. Time around model-year changeovers and contract renewals, when plants reset suppliers, rather than at calendar year end.

Illustrative example. The company, rates and results are fictional, to show the method.

Lakeshore Safety Supply (lakeshoresafety.example) installs and restocks PPE vending machines in West Michigan plants.

• Kent County manufacturing sites with 20 to 249 employees: 231 + 127 + 117 = 475.
• Ottawa County adds 104 + 58 + 45 = 207, for 682 in all.
• It assumes 60% use enough gloves, glasses and hearing protection to justify a machine: about 410 plants.
• Winning 4% in the first year would mean about 16 installations.

Telling a 60-person machining plant from a 60-person warehouse takes research on each site. Bebop can search for "manufacturing plants in Kent and Ottawa counties with 50 to 249 employees" and explain why each one fits.

Subject: Glove and PPE spend at [plant name]

Hi [first name],

Most plants your size in [Holland / Wyoming / Grand Rapids] lose track of PPE between the crib and the line, and it shows up as reorders every week.

We install a vending machine on the floor, restock it ourselves and send you usage by shift and employee each month. Plants usually cut PPE spend in the first quarter.

Could I come by and look at where a machine would sit at [plant name]?

[Your name], Lakeshore Safety Supply

Next step: go deeper on the sector with manufacturing companies in Michigan.