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JTF Investigative Services
“Searching for a lost family member became a collaborative effort and his enthusiasm and excitement in finally have pieced together the puzzle made a complicated and foreign process comforting.”
Best Private Investigators near Lake Oswego, OR
3 of these agencies are based in Lake Oswego; the others serve Lake Oswego from towns including Vancouver, WA (16 mi), Portland (9 mi) and Clackamas (7 mi).
5 open 24/7 · 12 open weekends · 18 rated 4.5+ · 8 show a license
Data verified October 16, 2026
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Gunderson Investigations and Services
“Wayne Gunderson and Gunderson Services, LLC, have performed for this office in an exemplary way and have an excellent reputation in the community in both Oregon and Washington.”
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People Locator Service
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PI Services
- Papers
- Process Server
- Documents
“When it finally became clear that the builder was no longer in the metro area and possibly even the country, PI Services prepared the necessary documentation to move my case forward”
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Solid Serve Legal
- Petition
- Questions
- Delivery
“At first I thought 3 delivery attempts might not be enough, then I realized she really did her homework before each attempt, so in my case, it only took 2 attempts within 4 days!”
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Northwest Investigations & Consulting
- Stars
- PI
- Results
“1st this place deserves five stars I rarely give them out but the company will go beyond the call of duty for you and complete a task fast for you they are legit.”
The 24 agencies on this page are the private investigators listed for Lake Oswego, OR. 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: Lake Oswego, OR
20 of the 24 agencies on this page have a rating, from 3.8 to 5.0 across 295 reviews; 2 have 50 or more reviews and 18 are rated 4.5 or higher. When clients rate these agencies on specific qualities, they most often praise responsiveness (97%), professionalism (93%) and value (83%). The topics that come up most in reviews of the agencies on this page are "communication" and "results". 5 are open around the clock; 12 are open on Saturdays and 8 on Sundays. The services the agencies on this page list most often on their websites are private investigation (4), background checks (2) and small claims (2). 8 show a license on their websites and 2 have a BBB rating of A or A+. 16 have ten or more years of experience, the longest 34 years. 5 offer urgent consultations and 7 offer a free initial consultation. We have a website on file for 23 of the agencies on this page; 21 publish a contact page and 22 list a public email. 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.
Why are investigation agencies outside Lake Oswego shown here?
3 of the 24 agencies have an address in Lake Oswego. The others come from other towns. Investigators travel to the subject, so an office one county over is rarely the issue. State licensing is the thing to check.
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Diligent Investigations
- Communication
“Robert at Diligent Investigations went above and beyond, putting in lots of time researching, communicating, and eventually providing the served papers to the defendant for a very fair price.”
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Provider's International Portland
- Confidence
- Perfection
- Organization
“Our organization strongly recommends to any company seeking competitive prices, professionalism and a company that goes above and beyond the call of duty both on the field and behind the scenes logistics.”
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North West Asset Reclamations
- Money
- Communication
“He was very efficient and I appreciated his ongoing communication during the reclamation process and would recommend him to anyone that was in need of this type of service.”
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Babnick and Associates
- PI
“This was my first experience with a private investigator, and I was very impressed by George's professionalism, knowledge, and exceptional response time.”
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Portland Private Investigators
- Future
“He was knowledgable about procedure and about the legal issues surrounding our case, and was forthcoming and clear about the cost of investagative services and options for proceeding within a budget.”
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Corporate Crime Control Protective Services
- Phone
- Team
- Matter
“I've been working for corporate crime control for about a year and now Scott castleman Josh Haywood Brent Graham and all my co-officers are fantastic group of people this is a company with extraordinary integrity I enjoy and love working for these gu...”
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A.T. Olson Consulting
- Law Enforcement
- Students
- Training
“Aaron has developed a reputation for conducting unbiased, in-depth and professional confidential and sensitive investigations for city and county municipalities regarding questions of professional and ethical behavior of elected and appointment per...”
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Bluecord International
“Had to quit due to relocating out of state, but would absolutely work for them again.”
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Complete Screening Agency
“Friendly staff with quick and accurate results.”
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Foremost Investigations
- Individual
- Company
- Results
“I had made 2 previous calls to 2 other agencies and was ready to give up as they sounded like I wasn't worth the time or trouble to talk to, let alone meet with me.”
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Virtus Group Investigations
“John discovered the man had a rap sheet a mile long, convictions, tax evasion, multiple alias names, liens, judgements, and multiple phony storefront addresses.”
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Internal Affairs Private Investigations
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Sherwood PI
“James understands people and how to monitor and initiate conversation w/o escalating the situation.”
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Northwest Corporate Investigations
“I love you too”
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BLI Investigations
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Mold Investigations
“High level problem solvers.”
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Investigative Solutions
- Company
“This company was born here out of necessity to pursue truth and has the roots to serve this county and entire pdx area far better than others you'll find.”
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Mountain Investigations
Private Detective Services in Lake Oswego, OR Cost Estimates
Minimum cost
$300
Maximum cost
$9500
National Average
$1200
Avg Per Hour Rates
$125
$700
$2000
Average price range is based on 496 cost profiles
Why these companies made our list
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