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1870 – 2020
The published decennial series, as carried in the U.S. Census Bureau's Census of Population and Housing and reproduced in the town's standard summary, runs as follows. 1870: 223. 1880: 346, up 55.2 percent. 1900: 504. 1910: 681, up 35.1 percent. 1920: 684, up 0.4 percent. 1930: 823, up 20.3 percent. 1940: 978, up 18.8 percent. 1950: 1,165, up 19.1 percent. 1960: 1,241, up 6.5 percent. 1970: 1,259, up 1.5 percent. 1980: 1,211, down 3.8 percent. 1990: 1,366, up 12.8 percent. 2000: 1,402, up 2.6 percent. 2010: 1,896, up 35.2 percent. 2020: 1,623, down 14.4 percent.
Two censuses are missing from that run, and the leg names them rather than stepping over them. No 1890 town figure is carried either: the 1890 federal census schedules were largely destroyed by fire in 1921, and no published 1890 place count for North Liberty was reached. The series therefore begins, honestly, in 1870 — thirty-four years after the plat — and that late start is itself a fact about a small unincorporated village, not a gap papered over.
One secondary carrier variance prints here because the leg does not silently choose. Both tellings stand; a reader who needs the block-level working goes to the Census Bureau's Gazetteer and redistricting files, not to either summary.