Best Police Scanner for Chicago (2026)
Chicago Police Department is fully encrypted, and so are the Cook County Sheriff and Illinois State Police. But Chicago Fire's main dispatch is still in the clear, and the metro has hundreds of suburban agencies — many accessible with the right P25 digital scanner. Here's the honest picture of what you can hear and what you need to hear it.
Chicago Police: Fully Encrypted
CPD, the Cook County Sheriff, and Illinois State Police law-enforcement channels are all encrypted. No scanner at any price can decode these transmissions. If you're buying a scanner specifically to hear CPD dispatch, stop — it won't work. Chicago Fire's main fire and EMS dispatch, on the other hand, is still in the clear on P25 as of June 2026.
What can you hear? Read on.
Full Chicago encryption analysis →What You CAN Hear in the Chicago Metro
Collar County Agencies
Many agencies in DuPage, Lake, Will, and Kane counties operate with mixed encryption. Suburban police, fire, and EMS in these areas are often partially accessible on P25.
IDOT / Road Conditions
Illinois Department of Transportation maintains accessible communications for road crews and incident response on area expressways.
Mutual Aid Channels
Regional fire mutual aid and NIMS interoperability channels periodically carry cross-agency communications during major incidents.
Aviation (O'Hare / Midway)
Air traffic control at ORD and MDW operates on public VHF airband frequencies — fully receivable with any digital scanner or aircraft radio.
Amateur Radio
The Chicago area has an active amateur radio community with numerous VHF/UHF repeaters on 146.520 MHz (national simplex) and local repeater frequencies.
NOAA Weather
Chicago area NOAA weather broadcasts on 162.475 MHz and 162.550 MHz, providing storm alerts and forecasts for the metro area and Lake Michigan.
Scanner Recommendations for Chicago
Which Scanner to Buy
You Need a P25 Phase II Scanner
STARCOM21 — the radio system used throughout the Chicago metro — is a P25 Phase II trunked system. To monitor suburban agencies that haven't fully encrypted, you need a scanner that decodes P25 Phase II. Basic analog scanners and older digital scanners that only do Phase I will not work. The BCD436HP and SDS100 are the two most widely used options in the Chicago area.
Uniden SDS100: Best for Portable / Mobile Use
The SDS100's portability and built-in GPS make it ideal for mobile monitoring in the Chicago metro. The GPS automatically loads nearby talkgroups as you move between suburbs — useful if you're covering a large area of the collar counties. Battery-powered and fits in a glove compartment.
Check SDS100 price on Amazon →Uniden BCD436HP: Best Value
At $100+ less than the SDS100, the BCD436HP handles P25 Phase II and covers the same STARCOM21 system. For home monitoring of suburban Chicago agencies, the BCD436HP delivers identical digital performance. The primary trade-off is no built-in GPS — you program it for a fixed location.
Check BCD436HP price on Amazon →RTL-SDR V4 + SDRTrunk: Budget P25 Option
The RTL-SDR V4 dongle with SDRTrunk software can decode P25 Phase I and Phase II on a Windows or Linux computer. At $35 for the dongle plus a Tram 1411 antenna, this is the most affordable way into digital P25 decoding. It requires a computer running 24/7 and a learning curve — but it works.
Check RTL-SDR V4 price on Amazon →Chicago Scanner Frequency Quick Reference
| System / Agency | Status | Notes |
|---|---|---|
| Chicago Police Dept. | Encrypted | Fully encrypted; official feeds delayed 30 min |
| Chicago Fire Dept. | Open | Main fire/EMS dispatch in the clear (P25); some tactical encrypted |
| Cook County Sheriff | Encrypted | STARCOM21, ~99% encrypted |
| Illinois State Police | Encrypted | STARCOM21; law-enforcement talkgroups encrypted |
| DuPage County Sheriff | Partial | Some channels open; varies by municipality |
| Lake County Sheriff | Partial | Mixed; Highland Park PD remained open |
| O'Hare ATC (ORD) | Open | VHF airband, all frequencies public |
| NOAA Weather WX | Open | 162.475 / 162.550 MHz |
Verify current status at RadioReference.com — encryption status changes.
Frequently Asked Questions
Is Chicago police radio encrypted?
Yes. Chicago Police Department dispatch is fully encrypted, along with Cook County Sheriff and Illinois State Police law-enforcement talkgroups on STARCOM21. You cannot hear Chicago police dispatch live on any scanner—only the city's official 30-minute delayed feeds. Chicago Fire's main dispatch, however, remains in the clear.
What can I still listen to on a scanner in Chicago?
Illinois State Police ISPERN (some unencrypted channels), Chicago suburban municipalities (many in DuPage, Lake, Will, and Kane counties are partially open), Cook County Forest Preserve, Illinois Department of Transportation, and amateur radio repeaters. Regional fire mutual aid channels are also periodically accessible.
Do I need a digital scanner for Chicago suburbs?
Yes. The Chicago metro area is served by P25 digital radio systems. A digital scanner capable of P25 Phase I and Phase II (like the BCD436HP or SDS100) is required. Analog-only scanners will not decode Chicago-area digital transmissions.
Can I hear Cook County or Illinois State Police?
Cook County Sheriff is encrypted on STARCOM21. Illinois State Police operates on STARCOM21 as well, and is also encrypted. Some ISP district-level communications are unencrypted on separate channels — check RadioReference.com for current ISP channel status in the Chicago district.
What happened to the Chicago fire scanner?
Chicago Fire moved to digital P25 — but unlike CPD, its main fire and EMS dispatch channels remain unencrypted as of June 2026, per the RadioReference database. You can still hear CFD with a P25-capable scanner; some tactical channels are encrypted. Suburban fire departments in the collar counties vary.
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