I live in 77493, Old town Katy, and have lived here since 1983. Love it here. We've had a couple of things stolen out of cars parked in the driveway over the years, but nothing major on my street. There is a crime everywhere ya know and everyone has their own defintion of "safe"! I see some have suggested websites to check crime stats - and you can actually go into the Katy Police Station on Franz, just a couple of blocks east of Katyland and talked to officers there. Very nice and friendly people who will be happy to help.
Good luck - call if I can help.