Source: CSV mapping; ZCTAs fetched via API per zona
Boundary mode: Uses zona polygons to find overlapping ZCTAs for all zonas
Map Controls
Pins are for checking a single location. Draw mode is for sketching an area and finding overlapping ZIPs.
Draw a Polygon
Use Draw Mode to sketch a polygon. Double‑click to finish a shape. While in Draw Mode, map clicks create vertices (pin is disabled). Switch back to Pin Mode to click and check a single point.