Capital Investigation Services
“Dennis showed up for us on a Sunday in 20 minutes very promptly and professional”
Best Private Investigators near San Marcos, TX
2 of these agencies are based in San Marcos; the others serve San Marcos from towns including Austin (32 mi), Dripping Springs (25 mi) and Cibolo (28 mi).
2 open 24/7 · 5 open weekends · 7 rated 4.5+ · 5 show a license
Data verified October 18, 2026
Acme Investigations
Discreet Investigations
Graycat PI, Corp
“Great Cat its one of the most professional options in the market for a very specific kind of investigations, they are very professional and reliable, don't hesitate on contact them.”
Investigations Unlimited
BD3 Professional Investigations
The 10 agencies on this page are the private investigators listed for San Marcos, TX. 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: San Marcos, TX
7 of the 10 agencies on this page have a rating, from 4.9 to 5.0 across 62 reviews. 2 are open around the clock; 5 are open on Saturdays and 3 on Sundays. 5 show a license on their websites and 4 have a BBB rating of A or A+. 7 have ten or more years of experience, the longest 33 years. 2 offer urgent consultations; 3 offer a free initial consultation and 1 lists coupons or special offers. We have a website on file for all 10 of the agencies on this page; 8 publish a contact page; 5 list a public email and 1 takes 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.
Why are investigation agencies outside San Marcos shown here?
2 of the 10 agencies have an address in San Marcos. 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.
Travis Investigations
“You and your agency deserve WAY MORE than 5 STARS for stepping in and assisting my San Antonio based agency with excellent Profesional skills!”
Sage Investigations
“About a year ago, I required the assistance of a reliable investigation company, and I can confidently say that Sage Investigations was there for me every step of the way.”
United International Investigations
Superior Investigating & Consulting
Why these companies made our list
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