SGS North America Inc. OGC Jacintoport

Houston's laboratory category lists 77 entries, but a count that size hides how many actually connect you to someone. Of those, 71 have a phone number on file and 71 have a website listed, so most zips give you a real way to reach a lab instead of just a name on a page. Clusters show up in 77054 with 6 listings and 77025 with 5, alongside smaller groups scattered through zips like 77084, 77014, and 77099. None of these listings are marked Sponsored, since paid placement is off for this category right now, so what you see is an unranked set, not a lineup shaped by anyone's ad budget.

If you're comparing labs across Houston, call two or three before you commit, since a phone number on file doesn't guarantee current hours or services. And if you manage one of these labs and your entry is missing a working number or site, you can claim the listing and add those details yourself, saving a patient in your zip an extra search.