Senate District 31 consists of the following:
Hamilton County TOWNSHIPS:
Delaware Township, Fall Creek Township
Marion County PRECINCTS:
LA-05, LA-06, LA-07, LA-08, LA-09, LA-10, LA-11, LA-13, LA-14, LA-15, LA-16, LA-17, LA-18, LA-19, LA-23, LA-24, LA-25, LA-26, LA-27, LA-28, LA-29, LA-34, LA-35, LA-36, LA-41
IC 2-1-15-31