Trusted Attorneys

Respected for Results

Accidents can be chaotic. And if you don't take strong legal action as soon as possible, you might not get the compensation you rightfully deserve. That's why you need an experienced attorney who understands how the legal system works. You need someone you trust who will focus on your case. You need someone who will help you get your life back on track. You need Zimmer, Duncan & Cole, LLP.

Since 1948, our law firm has rigorously represented injury victims in Sioux Falls and throughout South Dakota. From car accidents to other complex legal matters, our attorneys have set the gold standard of care in case after case. And since we're selective about who we work with, we can focus our attention on a limited number of legal cases. That's why we have such a well-earned reputation. People know we take each case personally. They know we fight to win.

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Zimmer, Duncan & Cole, LLP

There's no substitute for experience no substitute for hard work.

Who We Are

Your Lawyer For Life

Some law firms may try to talk you out of going to court. They may encourage you to simply accept a settlement offer as soon as possible. We think differently at Zimmer, Duncan & Cole, LLP. We do what's right for our clients. And if that means going to court to successfully resolve your case, that's exactly what we will do

We don't back down from tough cases. We thrive on them. That's because we don't focus on short-term results. We think long term. If your accident could affect you for the rest of your life, your verdict or settlement offer should reflect that.

That same forward-thinking approach applies to our relationship with our clients. We think beyond the current case we're handling on your behalf. We want to be your lawyer for life. Whether you need assistance with an estate or another legal matter, we're here for you when you need us most.

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Why Choose Us

Your Opportunity For Justice

You often only have one opportunity for justice after your accident. Insurance providers and their attorneys know this. That's why they often make a settlement offer right away. They know that if they can convince you to accept their offer, they can often avoid paying thousands or even millions of dollars years from now for medical bills, lost income and other expenses.

We learned these lessons through decades of dealing with complicated legal cases. There's no substitute for experience, no substitute for hard work. We also know we're often racing against the clock. Critical deadlines exist for many legal cases. And if you miss them, you could miss out.

Each legal case is unique. And so is our approach. As your attorney, we will take the time to learn about your case, then develop a unique approach that addresses your specific legal needs. Our approach often includes:

  • Independently investigating your case
  • Helping you receive the medical care you need
  • Consulting with experts
  • Interviewing witnesses
  • Negotiating with insurance companies
  • Taking legal action if necessary
  • Keeping you informed

Don't take chances with your future. Take action. Contact a law firm you can trust to put your best interests first. Contact Zimmer, Duncan & Cole, LLP and schedule your free consultation right now. We work hard for hard-working people throughout South Dakota.

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Zimmer, Duncan & Cole, LLP

Case Results

Hard Work Pays Off

Our law firm wants to work with you and help you resolve your unique legal needs. Contact us immediately to learn how we can help you with your specific case. We handle a wide range of cases in South Dakota, including:

Car Accident


Car Accident


Contested Will


Car Accident


Estate Fraud


Truck Accident


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Client Reviews


Amanda was wonderful to work with and very timely. All of our documents were thoroughly and thoughtfully put together. We felt we were listened to and very respected. Thank you Amanda for such a wonderful job.


I've worked with the attorneys and staff at ZDC for the last 15 years and I'm confident you will find them the best law practice to work with in the Midwest. Professional, dedicated, compassionate, honest, and fair are just a few of the adjectives that come to mind. They are extremely well-versed in all areas of law and are very well respected by their competitors and the court. You will receive the best service available.


Very professional, caring and went above and beyond to ask all the right questions and think of things I hadn't even thought to mention.


Thank you so much for all your help through these processes. I believe I have chosen the right firm to help us the best! Your help is greatly appreciated. Thank you again!


I was involved in a terrrible auto accident. I was so pleased that I could find an attorney with an office in Parker as well as in Sioux Falls, who was so compassionate and understanding. They helped me enormously throughout this ordeal and I can't thank them enough.


Jeff and his staff recently helped us in a very difficult time. They always listened to our questions and concerns, explained things completely in language we understood, told us what our options were, and kept us informed on what was going on in the case. This was the second time we had needed Jeff's services and we've been very pleased with the way he handled both cases. We highly recommend the firm.


I can't thank you enough for all you've done for me this year. Your professionalism and generosity have meant the world to me.


Jeff Cole kept us very informed on what was going on and what research he was doing on our case. Jeff's knowledge of other cases and the time and effort he took to study them was very encouraging to us. We strongly feel that Jeff Cole went the extra mile for us and as a result, all charges against our son were dropped.


We really appreciated the way you dealt with us, and how you handled things in the courtroom. From now on, you are our lawyer!

Sioux Falls

5000 S. Broadband Lane, Suite 119
Sioux Falls, SD 57108

Phone: 605-361-9840
Fax: 605-271-7872
Toll Free: 888-733-2992
Location Details


120 N. Main Street
Parker, SD 57053

Phone: 605-297-4446
Fax: 605-297-4488
Toll Free: 888-733-2992
Location Details