O'Leary Law Office Sioux Falls, SD office in Sioux Falls, South Dakota

O'Leary Law Office Sioux Falls, SD

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3500 S Phillips Ave, Ste 120, Sioux Falls, South Dakota, United States
40 Years of Practicing, since 1986
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+1 605-334-4506

Decades of Litigation and Insurance Defense Excellence

O'Leary Law Office is a distinguished legal practice in Sioux Falls, South Dakota, with a history of service dating back to 1986. Founded by Mark D. O'Leary, the firm has built a reputation for its rigorous approach to civil litigation and insurance defense. The practice is rooted in a philosophy of client-centered representation, ensuring that businesses and individuals receive clear communication and strategic counsel throughout the legal process. The firm serves clients not only in South Dakota but also in Minnesota and Texas, reflecting the broad reach of its legal expertise.

The attorneys at O'Leary Law Office are seasoned litigators who understand the nuances of the courtroom. Mark O'Leary, an AV Preeminent rated attorney, brings decades of experience to the table, particularly in complex torts and business disputes. The firm has evolved over time to include a new generation of legal talent, with Katie O'Leary joining the practice to continue the family tradition of legal excellence. Whether defending a company against a liability claim or advocating for a victim of negligence, the firm applies the same level of diligence and ethical standards to every case.

Focused Practice Areas

O'Leary Law Office concentrates its practice on specific areas of civil law to ensure high-quality representation:

  • Business Litigation: Representing companies in contract disputes, partnership conflicts, and other commercial disagreements.
  • Insurance Law: Providing defense for insurance carriers and policyholders in coverage disputes, bad faith claims, and subrogation matters.
  • Personal Injury: Advocating for individuals injured in automobile accidents, slip and falls, and other incidents caused by negligence.
  • Workers' Compensation: Handling claims related to workplace injuries, ensuring that the rights of both employers and employees are upheld under state law.
  • Estate Planning: Assisting clients with wills and end-of-life planning to secure their legacy.

Central Sioux Falls Location

The office is located on South Phillips Avenue, a key thoroughfare in Sioux Falls. Situated in a professional building south of the downtown core, the location offers convenient access for clients across the city. The firm's longevity and stability in the Sioux Falls market make it a reliable choice for those seeking experienced legal counsel for civil matters.


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Location & Access

Primary Address

Located in the southern part of Sioux Falls near Spencer Park and Tomar Park.

Building Location

This law office is located on the first floor of the two-story Jameson Building I, positioned at the southeast corner of E 43rd Street and S Phillips Avenue, close to the scenic Spencer Park.

Parking Details

A dedicated, free public surface parking lot with 54 stalls is available directly surrounding the office building, offering easy access for clients and visitors.

Public Transit

Served by Sioux Area Metro Blue Route (South Minnesota); nearest stop is at Minnesota Ave & 43rd St.

Accessibility / Suite Access

Enter the Jameson Building I through the main front entrance on the ground floor. Walk past the central directory, and you will find the law office in Ste 120 on the first floor.

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