Atty. Dennis Duncan

Atty. Dennis Duncan

Dennis Duncan is a lawyer practicing legislative lobbying, civil litigation, insurance and 4 other areas of law. Dennis received a B.A. degree from University of South Dakota in 1970, and has been licensed for 53 years.

Sioux Falls Sioux Falls 53 yrs experience 53 year
Call (605) 789-3757 Book Appointment

Profile Summary

About Dennis Duncan at a glance

Dennis Duncan is a Member based in Sioux Falls, South Dakota, practicing at The Duncan Law Firm LLP. They have 53+ years of legal experience, licensed to practice since 1973. Their practice focuses on formation, business, litigation, government, and health care. Admitted to practice in South Dakota (1973) and U.S. District Court, District of South Dakota (1974). Educated at University of South Dakota (J.D., 1973) and University of South Dakota (B.A., 1970). Recognitions include AV Preeminent. Active member of The State Bar of South Dakota American Bar Association South Dakota Defense Lawyers Association American Medical Association. Serands clients in Sioux Falls, SD and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Dennis Duncan is a lawyer practicing legislative lobbying, civil litigation, insurance and 4 other areas of law
  • Dennis received a B.A. degree from University of South Dakota in 1970, and has been licensed for 53 years
  • Dennis practices at The Duncan Law Firm LLP in Sioux Falls, SD and 1 other location

Practice Areas Explained

Dennis Duncan's Areas of Practice

Each practice area below reflects the types of cases Dennis Duncan handles, with a brief overview of what that area of law covers.

Business Formation

Dennis Duncan is one of 35,584 formation attorneys indexed nationally. Browse formation attorneys in South Dakota →

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

Dennis Duncan is one of 501,317 business attorneys indexed nationally. Browse business attorneys in South Dakota →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

Dennis Duncan is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in South Dakota →

Government & Administrative Law

Attorneys for administrative law, agency hearings, government contracts, licensing, and public benefits.

Dennis Duncan is one of 132,225 government attorneys indexed nationally. Browse government attorneys in South Dakota →

Health Care Law

Health care attorneys for HIPAA, Medicare, Medicaid, regulatory compliance, and medical licensing matters.

Dennis Duncan is one of 66,735 health care attorneys indexed nationally. Browse health care attorneys in South Dakota →

Jurisdictional Context

Why local counsel matters in South Dakota

Practicing law in South Dakota. Legal matters in South Dakota are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Sioux Falls are typically filed in the local municipal court or the appropriate South Dakota state district court, depending on subject matter and amount in controversy. An attorney licensed in South Dakota brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in South Dakota courts without local counsel or pro hac vice admission.

Looking for additional South Dakota attorneys? Browse all attorneys in Sioux Falls or all attorneys in South Dakota.

Frequently Asked

Common questions about Dennis Duncan

Where is Dennis Duncan's law office located?
Dennis Duncan's law practice is located in Sioux Falls, South Dakota. The firm is The Duncan Law Firm LLP. You can contact the office directly through this profile page.
What practice areas does Dennis Duncan handle?
Dennis Duncan focuses on formation, business, litigation, government, health care. Each practice area listed reflects experience handling cases of that type in South Dakota.
How long has Dennis Duncan practiced law?
Dennis Duncan has 53+ years of legal experience and has been licensed since 1973.
Where did Dennis Duncan go to law school?
Dennis Duncan earned their education at (J.D., 1973); (B.A., 1970).
How can I contact Dennis Duncan for a consultation?
You can contact Dennis Duncan directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.
What awards or recognition has Dennis Duncan received?
Dennis Duncan's notable recognition includes: AV Preeminent.

Education

J.D.
University of South Dakota
- 1973
B.A.
University of South Dakota
- 1970

Awards

AV Preeminent

Bar Admissions

South Dakota
Admitted: 1973
U.S. District Court, District of South Dakota
Admitted: 1974

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