You can search the voter database by precinct number and download the results. The downloaded file will return certificate number, voter status, precinct number, effective date, voter name, address and city/state/zip. The file will be saved as a CSV file, which can be imported into Microsoft Excel or Access.
IT IS A CRIMINAL OFFENSE TO USE VOTER REGISTRATION INFORMATION IN CONNECTION WITH ADVERTISING OR PROMOTING COMMERCIAL PRODUCTS OR SERVICES.
See Tex. Elec. Code Ann. §18.009.