Original research on Proximity Mail Marketing, built on the Quillus address corpus. Every piece carries its methodology and provenance; benchmarks are re-measured annually. Terms are defined in the glossary.
The canonical definition of Proximity Mail Marketing (PMM): direct mail anchored to a completed job, sent to a fixed count of the nearest homes, measured by the proximity radius, and tracked per household. Coined and placed on the record June 15, 2026.
The first national measurement of the proximity radius: k-nearest-neighbor analysis across 1,248 measured U.S. postal cities and 90.4 million geocoded homes. Median 100-home radius: 187 meters (~614 feet).