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The Census Geocoder — the Containment Test

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U.S. Census Bureau geocoder, 2020 vintage, run by the Health and Cemeteries passes, November 2026

What it is: a point-in-polygon test against the Bureau's current geography: give the geocoder an address, and it returns the civil geography the point stands in — township, tract, municipality, CDP. This build used it as a court of appeal for postal addresses, and validated it before trusting it: the control address 12840 Adams Road returns the Granger CDP itself (GEOID 1828800, POP100 30,337), so the instrument demonstrably knows where the CDP is. Its verdicts then decided real questions. The whole southern medical row the directories call Granger's — 3220 and 3221 Beacon Parkway, 6901–6913 North Main Street, 5805 and 6330 North Fir Road — returns Harris or Clay Township and the City of Mishawaka, no CDP. Healthwin, the county tuberculosis sanatorium at 20531 Darden Road, returns unincorporated Clay Township west of the CDP line. St. Joseph Valley Memorial Park returns Mishawaka at both its GNIS point (41.72174, −86.18314) and an interior point of the grounds.

Its standing, from this build's experience: the tests are reproducible — the coordinates are printed in the fragments, the vintage is stated, the run date is November 2026 — and they settle exactly one kind of question: which civil geography a point stands in, in the Bureau's current delineation. Where a fragment's claim is a boundary claim, the geocoder's answer governs.

Where it fails: everywhere else. The test says nothing about postal identity (the ZIP runs past the CDP's east line into Elkhart County), nothing about use or belonging — the memorial park is Granger's burying ground by the whole build's record while standing inside Mishawaka's limit — and nothing about the past: it cannot locate the Granger of 1950, only the delineation of today. The fragments print its verdicts as boundary facts and never let them swallow the lived ones.

Sources:

  1. U.S. Census Bureau geocoder (2020 vintage), run November 2026; GNIS feature record for St. Joseph Valley Memorial Park.

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Using this page? Copy a credit line. Last updated November 12, 2026.

Source: The Census Geocoder — the Containment Test, Moosed History by Project Moosed, https://history.projectmoosed.com/usa/midwest/indiana/granger/sources/census-geocoder-the-containment-test/