Best Private Investigators near Plainfield, IL

1 of these agencies is based in Plainfield; the others serve Plainfield from towns including Joliet (8 mi), Naperville (9 mi) and Westmont (18 mi).

2 open 24/7 · 4 open weekends · 7 rated 4.5+ · 6 show a license

Data verified October 21, 2026

Uthe Investigations & Process Service

Uthe Investigations & Process Service

4.8 33 reviews
“I trusted them with my case and hired them with short notice, they did the work in less than a week time.”
Serves Illinois, NationwideSince 1994LicensedPrices online
2314 Rte 59 #204
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Chicago Intel Agency

Chicago Intel Agency

5.0 110 reviews
“Two words to describe Michael Corella, Honesty and Integrity, I highly recommend him.”
Free consultationOpen 24 hoursSince 2015
Joliet, IL · 8 mi from Plainfield
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Krimson Investigations and Process Service

Krimson Investigations and Process Service

4.4 21 reviews
“Excellent and timely service and amazing customer service and very reasonably priced.”
Serves all of IllinoisSince 2013Licensed
Westmont, IL · 18 mi from Plainfield
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Book onlineBook
Great Lakes Professional Investigations

Great Lakes Professional Investigations

4.7 13 reviews
“I have had the pleasure of knowing Jacob and GLPI for almost a decade and to see the passion that he has for the work he does; in the industry is a huge positive in my book.”
Serves Cook County, DeKalb County +3LicensedSince 2011
Naperville, IL · 9 mi from Plainfield
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Squad 8-B Solutions

Squad 8-B Solutions

Since 2015
Naperville, IL · 9 mi from Plainfield
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Barrister Investigations & Filing Service

Barrister Investigations & Filing Service

4.3 3 reviews
“They have great customer service and quick turnaround.”
Joliet, IL · 8 mi from Plainfield
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The 10 agencies on this page are the private investigators listed for Plainfield, IL. What each one states about its license, its specialties and the areas it covers comes from its own website; ratings and quotes come from public reviews.

Area overview: Plainfield, IL

9 of the 10 agencies on this page have a rating, from 4.3 to 5.0 across 255 reviews; 1 has 50 or more reviews and 7 are rated 4.5 or higher. 2 are open around the clock; 4 are open on Saturdays and 2 on Sundays. 6 show a license on their websites. Domain records put 6 websites of the agencies on this page at ten or more years old; the oldest dates from 2005. 2 offer urgent consultations. We have a website on file for 7 of the agencies on this page; 4 publish a contact page; 5 list a public email and 2 take bookings online. We count these figures across the agencies on this page; distances are straight-line, and hours and prices change, so confirm the details with the agency before you book.

Which investigators listed for Plainfield describe their work online?

7 of the 10 agencies on this page have a website on file. Those pages are where an agency states its license, the kinds of investigation it takes on, and whether it works mainly for attorneys, for companies or for private clients. That last point changes how a report gets written.

Impact Investigations

Impact Investigations

Serves Chicago Metro Area, Cook County +3Since 1997LicensedOpen 24 hours
Westmont, IL · 18 mi from Plainfield
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Force Process Serving & Investigations

Force Process Serving & Investigations

5.0 1 review
Burr Ridge, IL · 19 mi from Plainfield
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Delorto Mazzola & Associates

Delorto Mazzola & Associates

Since 2000
Batavia, IL · 16 mi from Plainfield
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Judicial Attorney Services

Judicial Attorney Services

5.0 1 review
“Of course, there are times when the subject becomes uncooperative and service cannot be made, but I love that this company gives you the flexibility to go out whenever you can to get the job done right which in turn, increases the chance of your work to be served properly.”
Serves NationwideLicensedSince 2007
17 mi from Plainfield
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Why these companies made our list

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