Nationwide Investigations & Security, Inc.

Houston has 40 private investigation listings on this page. The busiest zip codes are 77002, 77056, and 77069, each with three entries, while 77027, 77058, 77070, 77092, and 77096 each carry two. If you're near one of those clusters, pull up two or three names and compare them before calling, since being close by won't tell you who handles the type of case you need. Every listing includes a phone number, and 38 of the 40 link out to a website, so you'll usually have more than one way to check a firm first.

None of these listings carry a Sponsored tag, because paid placement for this category hasn't been switched on in Houston, so the order you see reflects standard directory sequencing rather than payment. If you run one of these agencies and notice a missing website or an outdated phone number, you can claim the listing and update it, which gives someone searching near 77069 or 77002 accurate details instead of a dead end.