Here are some examples:
Not capitalized:
* The statewide election results are in.
* The program will be implemented statewide.
Capitalized:
* The Statewide Education Initiative is a success.
* Statewide, voter turnout was low. (Capitalized because it starts a sentence)
Important Note:
If "statewide" is part of a proper noun, such as a specific program or organization, then it should be capitalized. For example:
* The California Statewide Voter Registration System.