Internet providers make decisions about where to place their networks based on population density, internet adoption rates and other factors. You can contact Sparklight or AT&T directly to determine whether your neighborhood is included in their network plans.
Both AT&T and Sparklight offer those who are interested the chance to sign up to be notified if/when fiber is available where they live:
During the initial phase of installation, both providers are planning to concentrate their efforts on the north side of Victoria for economic reasons. The Victoria Broadband Commission is exploring solutions that would encourage internet providers to install their networks in underserved areas.