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Thank you for visiting our website. 

Riitters Thompson and Olson is proud to announce the recent acquisition of Clyde Stangl’s CPA firm in Pierz. The RTO and Clyde Stangl staff have joined forces to continue to provide great service to all of our clients in both the Little Falls and Pierz offices. RTO is very excited about becoming a part of the Pierz community.

Riitters Thompson & Olson P.A. is a full-service accounting firm serving clients throughout the Central Minnesota area, dedicated to providing our clients with professional, personalized services and guidance in a wide range of financial and business needs.

On this website, you will find information about Riitters Thompson & Olson P.A., including our list of services. We have also provided you with online resources to assist in the tax process and financial decision-making. These tools include downloadable tax forms and publications, financial calculators, news and links to other useful sites. Whether you are an individual or business in or around Central Minnesota, Riitters Thompson & Olson P.A. has years of valuable experience assisting professionals with their accounting needs.

*Notification of New Local Sales and Use Taxes Starting January 1, 2018* 

Morrison County Transit Sales and Use Tax


  • Telephone...
  • (320) 632-3646
  • Fax...
  • (320) 632-2502
  • Riitters Thompson & Olson P.A.
  • 16403 Haven Road
  • Little Falls, MN 56345
  • Telephone...
  • (320) 468-2868
  • Fax...
  • (320) 468-2884
  • Riitters Thompson & Olson P.A.
  • 300 Main St S
  • Pierz, MN 56364