3d Scales of Justice


Top-notch legal services

For almost 70 years, the O’Toole Law Firm has served businesses, families, and individuals all over Montana and North Dakota. Our goal is to build long-term relationships with our clients, and tailor our legal services to your diverse needs.

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About Us

Our founder, Loren J. O’Toole (1930 -­ 2013), began the O’Toole Law Firm in Plentywood, Montana in 1955. Born and raised in Plentywood, Loren attended Gonzaga University and then Georgetown Law School. Loren married Joanne Slavin in 1955 and together they raised seven children: Larry, Kevin, Michael, Patrick, Scott, Catherine, and Mary Joanne.

Loren was very active in the practice until his retirement in 2012. He was on the Board of Directors of Northern Oil & Gas, a publicly traded company, until his passing in December 2013.

Today, Loren O’Toole II (Larry) owns and operates the practice. For more on our attorneys, please visit our Biographies page.

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Practice Areas

Our firm provides legal expertise in a variety of areas. We treat each client’s situation with personalization and expertise designed to deliver optimal outcomes.

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Appellate Law


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Business Planning and Formation

Civil Litigation

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Estate Planning

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Oil and Gas

Real Estate

Our Team

Loren J. O’Toole II (Larry)


B.A. Magna Cum Laude 1974 to 1978

Gonzaga University Spokane, Washington

Juris Doctorate

1978 to 1981

Georgetown University Law Center

Washington, D.C.

About Larry

Larry returned to his hometown to practice with his father, Loren, in 1981. Larry is admitted to practice in Montana State Courts, United States District Court in Montana, Ninth Circuit Court of Appeals, United States District Court in North Dakota, and the Fort Peck Tribal Court.

Larry’s work experience includes extensive work before the Montana Board of Oil & Gas and litigation in all courts. His general practice includes estate planning, commercial law, and real estate transactions.

He is the husband of Carol and proud father of Thomas and Caitlin.

Additional Experience

  • 2 years on staff of U.S. Congressman Ron Marlenee
  • 23 years on Montana Board of Bar Examiners
  • Past member of Montana Lottery Commission

Logan P. Olson


B.A. Political Science and Government

2014 to 2017

Montana State University

Juris Doctorate

2017 to 2020

The University of Montana Law School

About Logan

After graduation in 2020, Logan began working as an attorney at the O’Toole Law Firm of Plentywood and Scobey. He is also the Daniels County Attorney residing in Flaxville, MT. He is licensed to practice law in both Montana and North Dakota.

He is the husband of Kimberly and proud father of Leo.

Other Work Experience

  • Daniels County Attorney
  • Legal Assistant at Terry F. Schaplow, P.C
  • Legal Student Associate at Beal Law Firm

Contact Us


209 N. Main St.

Plentywood, Montana 59254

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(406)- 765-2945 (fax)

Office Hours

Monday to Friday

9:00 am to 5:00 pm

Connect with Us

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