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THE FEDERAL POPULATION RECORD AS USED · 1850–2024
What it is: the Story of Walkerton section of the Population leg and the frame under half the build's numbers. The passes used the series in its several physical forms, and the forms matter: the 1950 census, volume II, part 14, for the mid-century town; the 1990 census's CPH-2-16 for the century's end; the 1920 Indiana bulletin — tables 2 and 3 read from the page images — for the town's first-hand 1900–1920 counts (1,037; 1,003; 1,031); the 2020 count taken not from a summary page but from the PL 94-171 redistricting file parsed at cell level, which is the form in which the town's 2,096 is a counted fact rather than a quoted one; the Bureau's Gazetteer files for areas and coordinates; and the American Community Survey's 2024 five-year estimates taken from the Bureau's summary files. The series' own traps are printed where they bite: the 1870 schedule's "Walkertown" rendering, West Troy's single appearance as a counted place, and the permanent existence of a second Union Township in Marshall County waiting to absorb a careless query.
Its limit, stated plainly: the Census Bureau's API now demands a key, and no sign-up was made in these passes — the 2020 count therefore rides on the published PL file rather than on a live pull, and three cells of the long series (1880, 1890, 1960) stand at spine-cited strength with their volume verification still owed (GAP-W5-1). A series this strong still has edges, and the edges are named.
Principal sources: U.S. Census Bureau publications and files as above; the Population leg for the series as printed, cell by cell.