Two people can be arrested for DUI in Naperville on the same night, three miles apart, and never see the same courthouse. One drives to Wheaton. The other drives to Joliet, twice as far, into a different judicial circuit with a different State’s Attorney’s office and a different set of local rules.
Naperville is the largest city in Illinois split between two counties, and almost nobody thinks about that until it decides where their case lands. It is not a technicality. It shapes who negotiates with your lawyer, which office’s practice on supervision and diversion applies, and how far you drive every time the case is called.
What to know
- Naperville sits in both DuPage County and Will County
- Where you were stopped decides the courthouse, not where you live
- DuPage cases go to Wheaton, Will cases go to Joliet, and the two are separate judicial circuits
- The offense and the statute are identical on either side of the line
- Your license suspension takes effect on the 46th day regardless of county
What Happens After a DUI Arrest in Naperville
The Stop
Most stops inside the city are made by the Naperville Police Department, which patrols both the DuPage and the Will portions. Route 59 along the eastern edge, Ogden Avenue, and the ramps onto I-88 also draw the Illinois State Police, and the DuPage and Will County Sheriffs each work their own side of the line.
Where the stop happened is the fact that matters most here, and it is recorded on the citation before anyone has thought about what it means.
The Arrest, the Testing, and Your License
The sequence that follows is identical on either side of the line. An officer asks questions at the window, may ask you to attempt roadside sobriety tests, and may put a handheld device in front of you before deciding whether to arrest. The reading that carries weight in court comes later, at a station, from an instrument that has to be calibrated and operated correctly to mean anything.
Refusing that later test is its own decision with its own cost. Under 625 ILCS 5/11-501.1, a refusal draws a longer suspension than a failed test, and that is as true in Joliet as it is in Wheaton.
The license case is administered by the Secretary of State, not by either county, so it runs identically whichever courthouse you end up in. Anyone facing a DUI charge in DuPage County is dealing with the criminal case and the license case at once, and that is equally true across the line in Will.
Day 46 Is the Same in Both Counties
Your suspension takes effect on the 46th day after the arrest no matter which county has your case. Stopping it means filing a petition inside that 45 day window, in the county where the case is pending.
Where the County Line Runs
The City of Naperville describes its DuPage County residents as those living north of 87th Street, with Washington Street dividing the townships on that side. South of 87th Street the city sits in Will County, again split east and west by Washington Street. Six townships touch the city in total.
So 87th Street is the practical answer to which county you were in. It is not a perfectly straight line, and city limits and county lines do not always agree at the edges, which is why the citation and the arrest report settle the question rather than a map.
It Follows the Stop, Not the Address
Venue is set by where the offense is alleged to have happened. Living on the DuPage side does not move a case that began south of 87th Street, and the reverse is equally true.
Two Courthouses, Two Circuits
A DuPage County case is typically heard at the DuPage County Courthouse, 505 N. County Farm Road in Wheaton, in the 18th Judicial Circuit. A Will County case is typically heard at the Will County Courthouse, 100 W. Jefferson Street in Joliet, in the 12th Judicial Circuit.
These are not two branches of one system. They are separate circuits that set their own local rules, keep their own calendars, and run their own call schedules. A lawyer appearing in both is working to two different sets of procedures.
Find Out Which County Has Your Case
It is on the citation, and everything else follows from it.
Or call us directly: (630) 261-9098
What the County Actually Changes
Start with what it does not change. The offense is defined by state law at 625 ILCS 5/11-501, so the charge, the classification, and the sentencing range are identical on both sides of 87th Street. The license consequence is federal to the state, handled by the Secretary of State, and does not vary by county either.
What changes is everything around the charge.
The prosecutor. DuPage County cases go to the DuPage County State’s Attorney. Will County cases go to the Will County State’s Attorney. These are separately elected offices with their own internal policies on DUI, and those policies are not published. How a first offense is approached, what a supervision recommendation looks like, and how much room exists on an amendment are matters of office practice, and office practice differs.
The local rules and the calendar. Each circuit sets its own. Filing deadlines, how the summary suspension hearing is scheduled against the criminal call, whether matters are heard together or separately, and how continuances are handled are all local questions with local answers.
Court-supervised programs. Evaluation and treatment requirements attached to a DUI disposition are administered county by county. The provider lists, the intake process, and the reporting requirements are not interchangeable between DuPage and Will.
The drive. This sounds trivial until you are doing it. Wheaton is roughly ten miles from central Naperville. Joliet is closer to twenty, in the other direction, and every court date is a round trip.
There is a further layer on the DuPage side, which is that a case may be brought by the county or by a municipal prosecutor rather than by the State’s Attorney. That distinction is separate from the county question and it is worth understanding on its own, because it changes the punishment range. We cover how a village prosecution differs from a county prosecution in more detail elsewhere.
Questions We Hear From Naperville
Read the citation. It names the county, and it names the court location and date you are expected to appear. If the stop happened north of 87th Street you are almost certainly in DuPage County, and south of it in Will County, but the paperwork is the authority rather than the map.
To Will County, in Joliet. Venue follows where the offense is alleged to have occurred, not where you live, where your car is registered, or which address is on your licence. Living a few streets from the courthouse in Wheaton does not move a case that began on the other side of 87th Street.
Not as a matter of convenience. Venue in a criminal case is not something a defendant selects, and a request to move proceedings is a narrow motion made for specific legal reasons rather than a preference about which courthouse is closer. Assume the case stays where it was filed.
The statute is the same, so the classification of the offense and the range available to the court are the same. What differs is the office prosecuting the case and the practice it follows, along with the local rules of the circuit and the programs administered in that county. Same law, different room.
No. The statutory summary suspension is administered by the Secretary of State and takes effect on the 46th day after arrest in either county. The petition challenging it is filed in the county where the criminal case is pending, so the county determines where you file, not whether the deadline applies.
Talk to a Naperville DUI Lawyer
Patrick Weiland spent nearly ten years as an Assistant State’s Attorney in DuPage County, where he supervised the felony trial division, before he began defending these cases. That background gives him no influence over any prosecutor or judge in either county. What it gives him is a working knowledge of how a State’s Attorney’s office decides what to do with a DUI file, which is the question sitting underneath everything on this page.
Your first consultation is free. Bring the citation and the notice of suspension from the night of the arrest, and the first thing we can tell you is which county you are actually in.