Badger Pass is a free tool from Yosemite Consulting for political media planners. It measures the geographic efficiency of ZIP-targeted media against census data, which covers the full population, not only the voter file. Look up any geography below, grade a ZIP list in the List Grader, or plan rating points in the CTV Planner.
ZIP-level figures use ZIP Code Tabulation Areas (ZCTAs), which do not match USPS ZIP codes exactly. See What's a ZCTA? for why that matters. Full data sources and vintages are on the methodology page.
Enter a ZCTA to see its districts