The Plain Answer First
77449 sits primarily in Harris County, Texas. That's the quick answer. But if you're looking up property records, voting precincts, or school districts, it's not quite that simple. Part of the 77449 zip code spills over into Fort Bend County, and the boundary runs right through residential neighborhoods. I learned this the hard way when I was pulling permit records for a contractor in Katy and got conflicting jurisdiction info depending on which side of a minor road a property sat on. Zip codes and counties don't match up cleanly. A single zip code can cross county lines, and a single county can contain dozens of zip codes. The 77449 area is managed by the USPS for mail delivery purposes, and those boundaries were drawn based on postal route efficiency, not municipal or county logic. Harris County is the dominant county here, covering the majority of the 77449 territory. The Fort Bend County portion tends to be in the western edge of the zip code, near the intersection with areas like Sugar Land and Missouri City. If you need to verify exactly which county a specific address falls under, don't guess based on the zip code alone. Pull the Harris County Appraisal District records or the Fort Bend County CAD site and search by address. The results will show you the exact county, whether that address is in the extraterritorial jurisdiction of a city, and sometimes which municipality provides services. That extra layer matters because Katy itself has an ETJ that extends beyond city limits, and county services can differ depending on whether you're inside or outside those boundaries.
Here's the thing most people miss: the county you're in affects your property taxes, your voting district, your jury duty assignment, and which sheriff's patrol zone covers your address. I had a client who thought she was in Fort Bend County based on her mailing address, but her property was actually in Harris County. She was filed under the wrong voter registration and almost showed up to the wrong precinct on election day. The fix was straightforward once we pulled the CAD records, but it cost her a half day of phone calls to get it corrected. School zones add another layer of confusion. The Katy ISD boundary doesn't align perfectly with either county line or zip code. Some addresses in 77449 are in Katy ISD, others bleed into Fort Bend CISD or even Alvin ISD depending on how the attendance zones are drawn. If you're moving or buying property, check the school zoning map directly rather than assuming based on county or zip code. A lot of real estate agents still get this wrong and tell buyers the school zone without verifying against the current year's boundary map. For practical purposes, if someone asks which county is 77449 Katy in, say Harris County and note the Fort Bend overlap. If you need legal or tax accuracy, pull the specific parcel data. The county tax assessor's website is free and takes about thirty seconds to confirm. There's no official "county lookup" tool that's faster than just searching the address directly on the relevant CAD site.
