Atty. Mark L Costello

Atty. Mark L Costello

Mr. Mark L Costello is a lawyer practicing criminal defense, general practice, tort law and 2 other areas of law.

Klamath Falls Klamath Falls 34 yrs experience 34 year
Call (541) 539-3240 Book Appointment

Profile Summary

About Mark L Costello at a glance

Mark L Costello is a Dep. Dist. Atty. based in Klamath Falls, Oregon. They have 34+ years of legal experience, licensed to practice since 1992. Their practice focuses on wills, personal injury, and criminal defense. Admitted to practice in Oregon (1992). Educated at University of Idaho (J.D., 1992) and Oregon State University (B.S., 1989). Serands clients in Klamath Falls, OR and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mr. Mark L Costello is a lawyer practicing criminal defense, general practice, tort law and 2 other areas of law
  • Mark received a B.S. degree from Oregon State University in 1989, and has been licensed for 34 years
  • Mark practices in Klamath Falls, OR

Practice Areas Explained

Mark L Costello's Areas of Practice

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

Wills

Mark L Costello is one of 34,541 wills attorneys indexed nationally. Browse wills attorneys in Oregon →

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.

Mark L Costello is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in Oregon →

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.

Mark L Costello is one of 214,270 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in Oregon →

Jurisdictional Context

Why local counsel matters in Oregon

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

Looking for additional Oregon attorneys? Browse all attorneys in Klamath Falls or all attorneys in Oregon.

Frequently Asked

Common questions about Mark L Costello

Where is Mark L Costello's law office located?
Mark L Costello's law practice is located in Klamath Falls, Oregon. You can contact the office directly through this profile page.
What practice areas does Mark L Costello handle?
Mark L Costello focuses on wills, personal injury, criminal defense. Each practice area listed reflects experience handling cases of that type in Oregon.
How long has Mark L Costello practiced law?
Mark L Costello has 34+ years of legal experience and has been licensed since 1992.
Where did Mark L Costello go to law school?
Mark L Costello earned their education at (J.D., 1992); (B.S., 1989).
How can I contact Mark L Costello for a consultation?
You can contact Mark L Costello 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.

Education

J.D.
University of Idaho
- 1992
B.S.
Oregon State University
- 1989

Bar Admissions

Oregon
Admitted: 1992

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