J.i.s Private Investigations
- Report
- Company
- The Future
2 of these agencies are based in San Marcos; the others serve San Marcos from towns including Austin (32 mi), San Antonio (45 mi) and Dripping Springs (25 mi).
11 open 24/7 · 14 open weekends · 19 rated 4.5+ · 13 show a license
Data verified October 18, 2026
The 24 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.

21 of the 24 agencies on this page have a rating, from 3.8 to 5.0 across 362 reviews; 3 have 50 or more reviews and 19 are rated 4.5 or higher. When clients rate these agencies on specific qualities, they most often praise professionalism (100%), responsiveness (80%) and quality (70%). 11 are open around the clock; 14 are open on Saturdays and 12 on Sundays. 13 show a license on their websites and 4 have a BBB rating of A or A+. 11 have ten or more years of experience, the longest 26 years. 11 offer urgent consultations; 4 offer a free initial consultation and 1 lists coupons or special offers. We have a website on file for all 24 of the agencies on this page; 20 publish a contact page; 14 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.
2 of the 24 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.