First, check the home page of the State agency that will be receiving the form or asked you to fill it out. Agency homepages frequently link directly to useful forms for their customers.
If you do not find a direct link to the form you need, check the State Forms Online Catalog provided by the Indiana Archives and Records Administration (IARA). Instructions for using the Catalog can be found using IARA's tutorial. For additional help using the Catalog, contact the Forms Management Division at fmd@iara.in.gov or 317/232-3380.
IARA requires agency permission to host a form. Therefore, if a form cannot be located, please contact the forms coordinator for the agency which owns the form in question.