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John Patrick Lonergan

Criminal defense Attorney at Peoria, IL

5.0   51 reviews

also known as Lonergan Law Group, Ltd.

About John

Learn John’s areas of practice.

My name is John P. Lonergan. I am a former prosecutor who has been practicing law since 1992. I devote my practice to the handling of criminal and family law matters. Licensed in Missouri, Texas, and Illinois, I have extensive experience in protecting the rights of the accused. I recognize that people require aggressive representation. I also recognize that many attorneys fail to stay in regular communication with their clients. It is my goal, in each and every case I handle, to ensure that your rights are fully protected and that you are always up to date as to the status of your case.
I will promptly return your phone calls, quickly respond to emails, and will make myself available to answer your questions. I regularly provide clients with my cell phone number so I may be reached directly.

Licensed for 30 years
State TX
Status Eligible to Practice in Texas
Acquired 2011
Updated 04/20/2023
State IL
Status Active and Authorized to Practice Law
Acquired 1993
Updated 04/01/2023
State MO
Status Inactive
Acquired 1992
Updated 05/08/2023

We have not found any instances of professional misconduct for this lawyer.

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Lonergan Law. Group, Ltd.
416 Main Street, Suite 927
Peoria, IL, 61602


5.0 / 5.0
  51 customer reviews
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Posted by Gail | May 20, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Five Stars!
I cannot express enough gratitude for the incredible legal services provided by my attorney during the seemingly never-ending ordeal of my divorce proceedings. I was trapped in a relentless battle with a narcissistic ex who refused to cooperate or negotiate on any terms. From the very first consultation, John demonstrated an unparalleled level of attentiveness, empathy, and professionalism. His genuine concern for my well-being and understanding of the complexities involved in my case immediately put me at ease. I finally felt like I had a competent and compassionate advocate fighting by my side. What truly sets John apart is his remarkable ability to navigate the intricacies of my divorce. Despite the seemingly insurmountable obstacles presented by my ex, he fearlessly forged ahead, leaving no stone unturned in pursuit of justice. His tenacity, strategic thinking, and thorough preparation were simply awe-inspiring. Finally, after ten long years, my divorce is final. John’s expertise and mastery of the law, combined with an unwavering commitment to my case, ultimately led to a favorable outcome. I cannot adequately express the relief and joy I experienced when the divorce was officially concluded, thanks to his unwavering efforts. To anyone who finds themselves in a similar situation, I wholeheartedly recommend John Lonergan. He possess an extraordinary ability to tackle the toughest of cases and an unwavering dedication to his clients' best interests. His outstanding legal skills, coupled with genuine compassion, make him an absolute gem in the legal field. Thank you, John, from the bottom of my heart!
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Posted by anonymous | March 9, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Great, honest, lawyer
Hired John for a few different cases and he was amazing. He is a great lawyer and his fees are very reasonable.
Posted by Allen | November 29, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Domestic battery
John got me the best possible outcome i could have hoped for. A not guilty plea. He took my calls when was overly nervous about the case and kept me calm through the entire ordeal.
Posted by anonymous | June 10, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Great attorney so down to earth
John was able to do exactly what we needed which was to end the nightmare. So happy with the outcome.
Posted by Pam | April 26, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Honest, down-to-earth, the best!
I can’t speak highly enough of Attorney Lonergan! Prior to consulting with him I’d spoken with another attorney who tried to take advantage of me and had me near hysteria believing I could serve jail time. Within 5 minutes of chatting with Mr. Lonergan I knew he was an honest, down-to-earth gentleman - and the person I wanted representing me. While we talked he gained access to and reviewed the police report, asked me some questions, gave me his opinion, I retained him and didn’t have to do a thing until we met on the day of the hearing. I could tell I mattered and he was going to do his very best for me. Normally I would have been a nervous wreck, but I walked into the court room with him, being fully informed of what to expect, feeling safe, and everything went exactly as he told me it would. I believe you won’t find a finer man or better attorney.
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Posted by anonymous | January 18, 2022
This review is from a person who hired this attorney.
| Hired Attorney
By far the best lawyer I’ve ever encountered!
John has developed great working relationships with States Attorney’s and contrary to a lot of lawyers he uses it to help you. He helped me. He saw that I have changed my life completely since my offense and he never stopped trying to help the court, and the prosecutor see that. My prosecutor is not a woman to take lightly. She is very good at her job and she too fights for what she believes in. John helped her see that I was worth giving a chance. Never in my life have I deserved one. The moment I did deserve a chance John helped me get it. John always treats people with respect. When he’s in the courtroom, you’ll see there’s no doubt that people respect him as well. He is the best lawyer in any courtroom. John isn’t just a good lawyer he’s a good person. I’m forever in his debt for all that he did to help me. No amount of money can repay that but if I was a wealthy man I’d give him so much more than what he asked to retain him as my attorney.
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Posted by Mellissa | January 15, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Best Lawyer!
Peoria is blessed to have John practicing law in the area. He was always honest and did his diligence to help get fair justice for us! We have had crappy lawyers but John has always been compassionate with no judgement.
Posted by Zachary | January 6, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Great guy
Kept it straight with me always was available for communication, friendly staff, better results than expected.
Posted by anonymous | November 13, 2021
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Calm and objective
Attorney Lonergan generously gave me a private consultation for no charge about some legal concerns that I had. I was able to get right in and see him at his office the same week I called. He didn't interrupt me at all when I explained my situation. He calmly and objectively gave me his advice about how to handle it. I left his office feeling very relieved. I will definitely call him to represent me if I need his services in the future.
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Posted by Cedricka | October 5, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Knowledgeable attorney
John and his staff were very knowledgeable and helpful with my case. If your needing assistance with a case definitely look into his law firm.
Posted by Brian Sanders | August 26, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Great attorney!
John Lonergan is a first class defense attorney. Him and his staff was very helpful and accurate. If I ever need an attorney John Lonergan will be the first one I call. Thank you John!!
Posted by anonymous | May 11, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Best criminal defense attorney in downstate Illinois.
I first contacted Criminal Defense Attorney John Lonergan after facing severe Manufacturing/Trafficking/Distribution/Possession with Intent to Deliver charges. John was able to make contact with the state's attorney and get all of the charges dropped down to one misdemeanor charge of possession with two years court supervision and a small fine. If you've been arrested and are facing harsh, excessive charges don't lose hope, contact The Lonergan Law Office, John helped me out of a heap of trouble and can help you too. If I ever need an attorney again in the future I will be retaining the Lonergan Law Office.
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Posted by anonymous | May 2, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Hands Down Best Attorney
I would like to share with anybody that is in need of an attorney at law my experience. A loved one of mine got a federal charge that carries a sentence guideline of 11 to 15 years. I called around looking for help, the first 3 attorneys I called sounded like salesman and they all wanted a lot of money up front and payments that were way out of my possibility. Then I spoke to attorney John, he called me and explained everything perfectly he told me what the process was going to be and how he was going to handle it. He looked into my loved one’s case and called me to go over it as well. I am so happy I decided to retain this awesome attorney. Let me tell you what he did, he went to work for us! He told me everything that was going on throughout the case, he promptly registered as my loved one’s attorney and he helped us get a sentence of 22 months plus time served. He charged me one set price which included if the case went to trial. Fortunately, it did not get to that. His staff Brooke and Jack always help you with anything you need. Any time I needed anything they were there for me and my family. I can tell you that you will be hiring the best attorney. This was a federal case and my loved one and my family where grateful for the results. If you need the best representation John is the attorney you need!
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Posted by anonymous | April 16, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Highly recommend John and his staff!
John and his staff were professional and knowledgeable. I am very thankful for their help. They were always available to answer my questions and concerns.
Posted by Nandi | March 31, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Tenacious Litigator
Even with multiple postponements due to COVID-19 requiring additional court appearances my fee stayed the same. Mr. Lonergan successfully litigated my case through trial. His fees are reasonable and his professionalism top notch.
Posted by Jade | March 30, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Speeding 26-35 MPH / Speeding in construction zone
In 2016 I was cited for speeding over 26MPH which is a misdemeanor in Illinois. On top of that I was speeding in a construction zone. Three days after receiving this ticket I moved to Las Vegas, Nevada to attend college. With all the craziness of the move I missed my court date. Fast forward to 2021 and I get accepted into my nursing program only to find out that I had a bench warrant from 2016 for not appearing in court due to this ticket. My heart completely dropped. Being a full time student I was concerned about so much. I called Lonegran Law group and hired them immediately. Jon Giraudo represented me and completely eased all of my anxiety! He was able to not only get my bench warrant retracted, so I didn’t have to travel all the way back to Illinois... but my speeding misdemeanor dismissed! Amazing! I ended up only having to pay a fine for speeding in a construction, which I was more than grateful for. He worked quickly and efficiently! His cost is more than reasonable as well. I would definitely recommend you hire him to represent you. You will not be disappointed.
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Posted by Robert | January 26, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Jon Giraudo FOID Assistance
Jon Giraudo is extremely knowledgeable, easy to communicate with, and displayed great understanding of my issue. Jon was able to guide me through the process for resolving my firearms issues with the Illinois State Police leading to my reinstatement.
Posted by Amy | October 14, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Excellent Attorney
Excellent attorney who makes himself available and cares only about his client's best interests.
Posted by Andre | September 30, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Straight to it no playing back and forth. If you want a lawyer that works with you and gets the job done. Hire John
Posted by Brigitte | September 24, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Happy Client
I knew about John from a couple people at work that sung praises about how nice he is and so good at his profession. They were so right. His manner is kind, calming, and direct. My grown up son with a mental illness had come home drunk one night and skipped his meds. Not good. We called the police and he was sent to the hospital. Months later the D.A. decided to file charges. We were frantic as the charges were serious. John kept us calm and explained the court system and what to expect. His assistant Brooke runs the place like a well oiled machine. Phone calls are always promptly returned by either she or John. John was able to get two of the more serious charges dropped down to lesser charges. We are forever grateful for John and his team for their excellent help.
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  • Free Consultation 60 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 8.6 (Excellent)

Work Experience

  • Owner
  • John Lonergan Law, Ltd.
  • 1997 - Present
  • Assistant States Attorney
  • Peoria County State's Attorney's Office
  • 1993 - 1997


  • Southern Illinois University, Carbondale
  • JD - Juris Doctor
  • 1992
  • Eastern Illinois University
  • BA - Bachelor of Arts
  • 1989

Legal Cases

  • Client wishes name withheld as his record will be cleared in a few years
  • No jail, TASC Probation-client will be able to expunge his conviction and criminal record in a few years.


  • Illinois State Bar Association
  • Member
  • 1993 - Present

Languages Spoken

  • English

Honors and Awards

  • Peer Review Rated
  • Martindale-Hubbell
  • 2018

Attorney endorsements

Received (5)
Given (0)
Endorse John
Criminal defense Attorney | Jul 10
Relationship: Worked together on matter
"John is always professional and competent. I have worked with John on a few matters as well as had an opportunity to observe him in various other matters. He always zealously represents his clients while maintaining a good working relationship with the prosecutors."
Criminal defense Attorney | Jul 07
Relationship: Fellow lawyer in community
"I have known John Lonergan for 12 years. Not only is he an outstanding criminal defense attorney, he is a great family law attorney as well. I know that anyone who chooses John as their attorney is in excellent hands. I would recommend John to anyone for their criminal defense or family law needs."
Criminal defense Attorney | Jul 07
Relationship: Opposing Counsel on matter
"I worked as an Assistant State's Attorney for years, working on the other side of cases against John. I was always impressed how he was able to work with a prosecutor without ruffling feathers. He was able to speak with a prosecutor about the case, focusing on the case, the issues the case presented, and each particular defendant. It is a pleasure to endorse John Lonergan."
Criminal defense Attorney | Jul 07
Relationship: Fellow lawyer in community
"I have known John Lonergan for more than 15 years. He provides great legal representation for a moderate price."
Divorce and separation Attorney | Jul 06
Relationship: Fellow lawyer in community
"I have known John for over nine years. I emphatically recommend his services and would not hesitate to recommend him to friends and family in need of representation in criminal and family law matters. Not only does he possess more than sound legal abilities, but what really sets John apart is how much he cares about his clients and wanting to achieve a good outcome for them. I have personally witnessed him going above and beyond for clients, often without them realizing."
This attorney hasn't created any attorney endorsements recently on Avvo.