ADDCO LLC was founded in 1953 in St. Paul, Minnesota on the values of sound engineering, quality manufacturing and attentive service.

Our expanded product line benefits you through:

• Global perspective with local, personalized service

• NEW engineering approaches to product development

• Alternative technologies for improved performance

We continue to develop new products to meet your changing needs, increasing equipment performance, and improving your return on investment. Through our two traffic divisions, Permanent DMS and Portable CMS, we focus on the different needs and requirements that are unique and specific to each of these. Our engineering, sales, operations, and service departments have years of experience in the dynamic and changeable message sign industry. Furthermore, ADDCO participates regularly in the development and assists in the adoption of national and international standards for DMS design and operation.


Our staff is a “one-stop shop” for the design, testing and manufacturing of our products. Specialists in electrical, mechanical and software engineering follow strict ISO 9001:2000 processes and procedures. This ensures that our equipment performs to your specifications.

Fully assembled equipment undergoes a final series of tests before it is shipped to be sure that you will be satisfied with its appearance and operation.


Skilled workers at each step of the process pay attention to detail. Whether receiving raw materials, welding, powder coat painting, or completing final assembly, each task is performed to exacting standards.

Employees work in teams, sharing their knowledge and experience, to produce equipment that will stand the test of time.

Service and Sales

Experienced customer service representatives are available 24/7/365 to answer questions and troubleshoot problems. Field technicians are available to give you prompt, personalized service when you need it most.

Our sales staff has in-depth product knowledge that assists you in choosing the equipment that is best for your operation.