Colorado ZIP Finder — session transcript

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Colorado ZIP Finder — session transcript

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Last edited May 31, 2026

Created on May 31, 2026

A map tool overlays Colorado ZIP code tabulation areas (ZCTAs) with Census county and city boundaries, highlighting the ZIP codes that best approximate a user-selected region. Upon clicking a county or city on the interactive Leaflet map, a plain-text list of matching ZIP codes appears below for easy copy-pasting into mailing-list outreach. The Flask backend uses GeoPandas and Shapely to compute polygon overlaps, while the frontend renders county and ZCTA shapes via Leaflet’s geojson layer, offering a practical, if imperfect, solution given that ZIP codes do not cleanly tessellate into civic borders.

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