Thermo Fisher Scientific

Twenty-six biotechnology companies show up on SiteCity for Houston, spread across zip codes rather than clustered downtown. The 77054 zip carries five listings, the largest share, while 77021, 77030, and 77084 each hold two. That spread means a company near the Medical Center isn't your only option if you're comparing labs across the city. Every listing has a website on file, and 24 of 26 include a phone number, so you can look something up or call two or three before narrowing your list.

None of these Houston listings are labeled Sponsored, since paid placement for this category hasn't started here yet, so the order you're browsing is a default directory list, not anything ranked or picked. If you own one of these companies and your listing is missing a phone number, you can claim it and fill in what's missing, which helps if you're one of the few names in a smaller zip like 77014.