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koordinates.com is a free place to find a variety of city boundary shapefiles. You can even pick the coordinate system. Here is a link to Texas cities. Do some searching around for other cities. They have a lot on this web site. You do need to create a login.
Please check out http://www.datasciencetoolkit.org/ a ready to use virtual machine(VM) for geocoding and reverse geocoding, it provides useful information including FIPS codes. i hope it will help.
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