Atty. John L. Duffy

Atty. John L. Duffy

John L. Duffy is a lawyer practicing appeals, general practice, government and 20 other areas of law.

Mason City Mason City 53 yrs experience 53 year
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Profile Summary

About John L. Duffy at a glance

John L. Duffy is an Attorney based in Mason City, Iowa, practicing at Heiny, McManigal, Duffy, Stambaugh & Anderson, P.L.C.. They have 53+ years of legal experience, licensed to practice since 1973. Their practice focuses on probate, personal injury, criminal defense, family law, and estate planning. Admitted to practice in Iowa (1973). Educated at University of Iowa (J.D., 1973) and Loras College (B.A., 1969). Recognitions include AV Preeminent. Active member of Cerro Gordo County and Iowa State Bar Associations. Serands clients in Mason City, IA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John L. Duffy is a lawyer practicing appeals, general practice, government and 20 other areas of law
  • John received a B.A. degree from Loras College in 1969, and has been licensed for 53 years
  • John practices at Heiny, McManigal, Duffy, Stambaugh & Anderson, P.L.C. in Mason City, IA

Practice Areas Explained

John L. Duffy's Areas of Practice

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

Probate

John L. Duffy is one of 128,014 probate attorneys indexed nationally. Browse probate attorneys in Iowa →

Personal Injury

Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.

John L. Duffy is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in Iowa →

Criminal Defense

A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.

John L. Duffy is one of 214,270 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in Iowa →

Family Law

Family law attorneys handle divorce, child custody, child support, adoption, prenups, and protective orders. Find verified family lawyers near you.

John L. Duffy is one of 187,066 family law attorneys indexed nationally. Browse family law attorneys in Iowa →

Estate Planning & Probate

An estate planning attorney prepares wills, trusts, powers of attorney, and healthcare directives to protect your family and pass on your assets.

John L. Duffy is one of 226,537 estate planning attorneys indexed nationally. Browse estate planning attorneys in Iowa →

Jurisdictional Context

Why local counsel matters in Iowa

Practicing law in Iowa. Legal matters in Iowa are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Mason City are typically filed in the local municipal court or the appropriate Iowa state district court, depending on subject matter and amount in controversy. An attorney licensed in Iowa 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 Iowa courts without local counsel or pro hac vice admission.

Looking for additional Iowa attorneys? Browse all attorneys in Mason City or all attorneys in Iowa.

Frequently Asked

Common questions about John L. Duffy

Where is John L. Duffy's law office located?
John L. Duffy's law practice is located in Mason City, Iowa. The firm is Heiny, McManigal, Duffy, Stambaugh & Anderson, P.L.C.. You can contact the office directly through this profile page.
What practice areas does John L. Duffy handle?
John L. Duffy focuses on probate, personal injury, criminal defense, family law, estate planning. Each practice area listed reflects experience handling cases of that type in Iowa.
How long has John L. Duffy practiced law?
John L. Duffy has 53+ years of legal experience and has been licensed since 1973.
Where did John L. Duffy go to law school?
John L. Duffy earned their education at (J.D., 1973); (B.A., 1969).
How can I contact John L. Duffy for a consultation?
You can contact John L. Duffy 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 John L. Duffy received?
John L. Duffy's notable recognition includes: AV Preeminent.

Education

J.D.
University of Iowa
- 1973
B.A.
Loras College
- 1969

Awards

AV Preeminent

Bar Admissions

Iowa
Admitted: 1973

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