Try Districting for ArcGIS

Showcase USA Today Uses GIS for Election Mapping

Districting for ArcGIS allows you to create defined groupings of geographic data, such as census tracts, ZIP codes, and precincts, by creating a districting plan.

With Districting for ArcGIS you can

• Redraw political boundaries
• Set up sales territories
• Define voting, school, and fire districts
• Analyze population densities, housing breakdowns, income and race statistics