Oak Brook
Criminal Defense
Attorney

Criminal Defense in Oak Brook

McMahon Law Offices is based in Oak Brook and defends residents and visitors facing criminal charges in the village and throughout DuPage County. All criminal cases arising in Oak Brook are prosecuted by the DuPage County State's Attorney and heard at the DuPage County Circuit Court in Wheaton — a courthouse our attorneys have practiced in exclusively for over two decades.

We handle every category of criminal charge filed in DuPage County:

• DUI Defense — First offense, aggravated DUI, felony DUI, breathalyzer refusal, statutory summary suspension hearings, and driver's license reinstatement
• Drug Crimes — Possession, possession with intent to deliver, delivery of a controlled substance, trafficking, and cannabis charges
• Domestic Violence — Domestic battery, aggravated domestic battery, violation of orders of protection, and criminal stalking
• Violent Crimes — Assault, aggravated battery, armed robbery, home invasion, and attempted murder
• Property Crimes — Retail theft, burglary, residential burglary, criminal trespass, and criminal damage to property
• Sex Crimes — Criminal sexual assault, criminal sexual abuse, predatory criminal sexual assault, and sex offender registration matters
• Weapon Crimes — Unlawful use of a weapon, aggravated UUW, FOID card violations, and illegal firearm possession
• Traffic Violations — Reckless driving, driving on a suspended or revoked license, leaving the scene of an accident, and street racing
• White Collar Crimes — Fraud, theft by deception, identity theft, embezzlement, and money laundering

Your Oak Brook Defense Team

Our office is in Oak Brook. Our attorneys have spent decades at the DuPage County Courthouse in Wheaton. One prosecuted cases there as a DuPage County Assistant State's Attorney. The other decided them as a Circuit Judge. For Oak Brook residents facing criminal charges, that combination of local presence and deep courthouse knowledge is unmatched in the area.

Founding Attorney

Michael F. McMahon

Former DuPage County Assistant State's Attorney with 20+ years of criminal defense experience in the 18th Judicial Circuit. Based in Oak Brook. Knows how DuPage County prosecutors build cases because he built them himself.

Former Prosecutor Oak Brook Office Avvo 10.0

Of Counsel

Judge Cary B. Pierce (Ret.)

Retired Circuit Judge of the 18th Judicial Circuit, DuPage County. Judge Pierce sat on the bench at the Wheaton courthouse and knows every judge currently serving there personally. His insight into how DuPage County judges evaluate evidence and respond to motions shapes every case strategy from day one.

Retired Judge 18th Circuit DuPage County

About Oak Brook

Oak Brook is a village of approximately 8,000 residents in DuPage County, located roughly 16 miles west of downtown Chicago. Despite its relatively small population, Oak Brook punches well above its weight in commercial activity. It is home to Oakbrook Center, one of the largest open-air shopping centers in the United States, the McDonald's global headquarters, and a significant concentration of corporate offices clustered around the I-88 and Route 83 interchange. The village draws hundreds of thousands of visitors annually to its shopping, hotels, and business district.

Oak Brook sits entirely within DuPage County. All criminal cases arising in Oak Brook are prosecuted by the DuPage County State's Attorney and heard at the DuPage County Circuit Court in Wheaton, approximately 8 miles to the northwest. The village is served by the Oak Brook Police Department, a well-funded and active department that patrols the commercial corridors, hotel zones, and residential areas with consistent enforcement.

Where Arrests Typically Occur in Oak Brook

Oak Brook's unique mix of major retail, corporate activity, and hotel concentration produces a distinct arrest profile compared to other DuPage County communities.

Oakbrook Center and Retail Corridor

Oakbrook Center is one of the most active retail theft enforcement zones in DuPage County. The Oak Brook Police Department works closely with mall security and loss prevention teams at anchor stores. Retail theft arrests at Oakbrook Center range from misdemeanor shoplifting to felony theft depending on the value of merchandise involved. Illinois law sets the felony threshold at $500 in retail merchandise, and multi-item or organized retail theft incidents regularly cross that line. A felony retail theft conviction carries consequences that extend well beyond fines.

I-88 and Route 83 Corridor

The I-88 interchange at Route 83 is one of the busiest in DuPage County and a consistent location for DUI enforcement, traffic stops, and vehicle searches by both Oak Brook PD and the Illinois State Police. Late-night stops on I-88 eastbound and westbound through Oak Brook generate a steady volume of DUI, drug possession, and weapon charges. If you were stopped on I-88, the arresting agency may be ISP rather than Oak Brook PD.

Hotel and Hospitality District

Oak Brook's hotel district along 22nd Street and Midwest Road generates arrests associated with events, conferences, and late-night activity. Disorderly conduct, domestic battery, and DUI arrests tied to hotel stays and corporate events are a consistent part of Oak Brook PD's caseload. These are often out-of-town individuals who find themselves facing a DuPage County charge in an unfamiliar courthouse.

Residential Areas

Oak Brook's residential neighborhoods generate domestic battery and order of protection violation arrests. The village has a high concentration of high-value homes and a demographic profile that makes domestic battery arrests particularly consequential for professional licensing, employment, and security clearances. These charges require immediate legal attention given the automatic no-contact orders that accompany arrest.

Where Oak Brook Criminal Cases Are Heard

All criminal charges arising in Oak Brook are filed in the DuPage County Circuit Court — the 18th Judicial Circuit — in Wheaton. Our office in Oak Brook is approximately 8 miles from the courthouse. We appear there regularly and know its procedures, judges, and prosecutorial tendencies in detail.

DuPage County Circuit Court

• Address: 505 N. County Farm Rd, Wheaton, IL 60187
• Phone: (630) 407-8700
• Hours: Monday through Friday, 8:30 AM to 4:30 PM
• Circuit: 18th Judicial Circuit of Illinois
• Prosecuting Office: DuPage County State's Attorney's Office
• Distance from Oak Brook: Approximately 8 miles northwest via I-88 and County Farm Rd

Bond court convenes the morning following arrest. If you or a family member was arrested in Oak Brook overnight, the first appearance is likely the following morning in Wheaton. An attorney at bond court can significantly affect the conditions of release, including the bond amount and any no-contact or travel restrictions imposed by the judge.

Law Enforcement in Oak Brook

The Oak Brook Police Department is the primary law enforcement agency in the village. It is a well-resourced department with active patrol presence across the commercial, hotel, and residential zones. The Illinois State Police also have jurisdiction on I-88 and are a common arresting agency for DUI and traffic stops on that corridor through Oak Brook.

Oak Brook Police Department

• Address: 1200 Oak Brook Rd, Oak Brook, IL 60523
• Non-Emergency: (630) 368-8700
• Jurisdiction: Village of Oak Brook

Illinois State Police — District 5

• Address: 1011 Larkin Ave, Elgin, IL 60123
• Phone: (847) 294-4400
• Patrols: I-88, Route 83, and state routes through DuPage County

Frequently Asked Questions

I was arrested at Oakbrook Center for shoplifting. Is that a felony?

It depends on the value of the merchandise. Under Illinois law, retail theft of merchandise valued at less than $500 is a Class A misdemeanor. Theft valued at $500 or more is a Class 3 felony. Large anchor stores at Oakbrook Center often aggregate the value of multiple items or rely on manufacturer suggested retail prices, which can push an incident over the felony threshold even when the actual out-of-pocket value seems lower. Do not assume your charge is a misdemeanor until an attorney has reviewed the specific allegations. Contact us for a free case review.

I was stopped on I-88 in Oak Brook by the State Police. Does my case go to DuPage County?

Yes. I-88 through Oak Brook falls within DuPage County, so an ISP stop on that corridor is filed in DuPage County Circuit Court in Wheaton. ISP stops follow specific documentation procedures that differ from Oak Brook PD stops. Your attorney will review the ISP arrest report and any dashcam footage as part of developing a defense strategy for a DUI or drug charge arising from that stop.

I am visiting Oak Brook for a conference and was arrested at my hotel. What do I do?

Call us immediately at (630) 953-4400. Our office is in Oak Brook. We handle out-of-town defendants regularly and can appear at bond court in Wheaton the following morning on your behalf. In many cases, we can handle court appearances for you so that you do not need to return to Illinois for routine procedural dates. The sooner you contact an attorney after arrest, the more options are available to you.

What happens to my driver's license after a DUI arrest in Oak Brook?

An Illinois DUI arrest triggers an automatic statutory summary suspension if you refused the breathalyzer or tested at or above the legal limit. The suspension takes effect 46 days after arrest and is entirely separate from any criminal penalties. You have the right to petition the court to rescind the suspension, but that petition must be filed promptly. Contact us immediately after a DUI arrest to preserve this option.