A ton of countries have consulates in Houston, going back to the expansion of the Port of Houston in the 1920's or so. And now we are a much larger city.
Some countries just have Honorary Consulates here, who attend trade conferences and cultural events. Looks like the French consulate is actually from France with a full time staff, though.
CoH website says over 90 countries are represented in the consular corps here:
https://www.houstontx.gov/motia/consular-corps.htmlI think they also assist w/ their own people working on visas and stuff. I coincidentally went into some generic office building that was packed w/ Central Americans one day, and found out the Consulate General for El Salvador was officed there.