The following are important locations for the International Union of Operating Engineers, Local Union 37:

• Baltimore Union Office
  5901 Harford Road, Suite A
  Baltimore, MD 21214
  
  
• Cumberland Union Office
  401 Decatur Street
  Cumberland, MD 21502
  
  
• Apprentice Training School Office
  5901 Harford Road, Suite A
  Baltimore, MD 21214
  
  
• Decision Science, Inc.
  5901 Harford Road, Suite C
  Baltimore, MD 21214
  
  
• Willig-Williams-Davidson-Singleton
  John Singleton
  404 Redland Court
  Owings Mills, MD 21117