North of Marysville
- Holmes Foundry No. 4
Port Huron- South Park Industrial Tracks
- United Brass & Aluminum Co. (early)
- Great Lakes Foundry
- Romeo Foundry (later maps show this as one of Holmes Foundries)
- Holmes Foundry (multiple locations)
- Lambert Coal Co.
- St. Clair County Road Commission (mid century)
- Port Huron Engine & Thresher (early)
- Electric Auto-Lite Co. (mid century)
- Prestolite Wire & Cable
- Anker Holth Manufacturing Co. (early)
- H.A. Smith Stores (grocery warehouse & bakery)
- Little Bros. Foundry
- Port Huron Building & Supply Co.
- South Side Lumber Co.
- Bowie Coal Company
Marysville
- Pressed Metals of America
- Detroit Edison Marysville Power Plant
- Detroit Edison Marysville Gas Plant
- Consumers Power Co. (Gas Plant) (1970’s)
- Morton Salt
- Wills St Clair/Chrysler Corp
- Marysville Supply Co. (early, later Bradbury Lumber Co.)
- Marysville Coal Co
- Athol Supply Manufacturing Co.
- St. Clair Rubber Co.
- Gar Wood Inc.
- Ainsworth Mfg
- Greif Bros Corp
- Kasle Bros.
- Mueller Brass Co. (Dow Complex)
- American Tape (Dow Complex)
- Michigan Elevator Exchange Division of Farm Bureau Service Inc. (Down Complex)
- via Team Track (?):
- Marysville Water Treatment Plan
- Marysville Golf Commission
St. Clair
- Fosters Building Supply Co.
- Dome Petroleum Corp / Amoco Oil Co.
- St. Clair Brick Yard (early 1920’s?)
- John A Biewer Lumber Co
- Diamond Crystal Salt
- Schlinkert Fuel & Supply Co
- Wm. R. Kemp Co.
- Walter Toebe Co. (1928, 1975)
- St. Clair County Road Comm. (1928)
Belle River
- Detroit Edison
Marine City
- Detroit Gasket
- E H Mauk & Sons/Summerville Wood Products
- Lumber Jack Building Center
- M & D Lumber Co
- Sta-Kool
- Paper Recovery
- Arnold Coal Co.
- McLouth Yards
- McLouth Foundry Company
- Quality Feed & Supply Co.
- Superior Concrete Company
- Marine City LCL shippers/receivers
- Becker’s Store
- Beebe Hardware
- Bridges & Son, W. W.
- Finsterwald’s
- Foster Drugs
- Knight’s 5c to $1.00 Store
- Miller’s
- Motive Parts
- Roll Furniture
- St. Clair Plastics Corp.
- Scott’s Hardware
- Smith Plumbing & Heating
- Algonac LCL shippers/receivers (Marine City Depot)
- Algonac Lumber Co.
- Alloy Marine Products Corp.
- Gilbert’s Furniture
- Lendzon’s 5c to $5.00 Stores, Inc.
- Streits’ Store
- Townsend Lumber Co.
- Turret Supply Co. (Sombra, Ontario, Canada)
- Roberts Coal Co.
- Michigan Farmers Co-Op Elevator Co.
- Chris Smith/Chris-Craft Corp. (Algonac) (1930-1957)
- Independent Sugar Company (early, bankrupt by early 1920’s)
- Michigan Salt Works (early)
