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1830 — 2020
Five doublings before the Civil War was cold: The first era is the settlement and canal era, and its rates are the rates of an empty county filling. Allen County went from 996 people in 1830 to 29,328 in 1860 — a twenty-nine-fold increase in thirty years — as the land sales, the Wabash and Erie Canal (reached Fort Wayne in the 1830s and completed through to Toledo in 1843) and the first farms pulled settlers into the Maumee valley. The city shared the surge a decade behind the county: 4,282 in 1850, then a 142.6 percent jump in the canal decade to 10,388 by 1860. The canal's own story belongs to the Story and Exports sections; in the count, it is the difference between the county's 1830 figure and everything after.
The second era, from 1860 to 1930, is the railroad and industrial surge, and it belongs to the city. Fort Wayne multiplied eleven times in seventy years — 10,388 to 114,946 — outpacing the county in every decade but one, as the rail shops, the knitting mills, the foundries and the electrical works stacked working-class neighborhoods around the rail lines. The city's share of the county peaked at 78.3 percent in 1930: at the end of the industrial surge, four of every five Allen County residents lived inside the Fort Wayne line. The drivers of that growth — the Pennsylvania and Wabash shops, Wayne Knitting, Jenney Electric and their successors — are told in the Business and Industrial Revolution sections.
The third era opens with the table's flattest line. Between 1930 and 1940 the city grew 3.0 percent and the county 5.7 percent, the slowest decade in either series: the Depression stopped the migration that had fed the city for seventy years, and the count nearly stopped with it. Growth resumed with the war and the postwar boom — the county added 125,371 people between 1940 and 1970, its largest thirty-year gain in absolute terms — but its geography had changed. The streetcar suburbs of the second era became the automobile suburbs of the fourth: from 1950 on, the county grew faster than the city in every decade, the city's share slid from 72.7 percent to 57.5 percent by 1990, and the new population piled into the unincorporated townships — Perry, Aboite, St. Joseph, Washington — a movement the Corridors section traces road by road.
The fifth era is the stall. The city recorded its only decline in 1980, down 3.4 percent, and the county its slowest growth, 2.2 percent, in 1990 — the census shadow of the factory closings told in the Business section and of the International Harvester shutdown of 1982–83, which fell between the two counts. The sixth era, from 1990 to 2020, is the recovery, and in the city series it must be read with the boundary warning in hand: the city's gains of 18.9 percent in 2000 and 23.3 percent in 2010 were powered substantially by annexation, above all the Southwest annexation that took effect in 2006 and brought 22,587 people into the city by the city's own 2016 count. The county's steadier gains of the same decades — 10.3, 7.1 and 8.5 percent — measure the underlying growth of the whole ground, and the 2020 census set both series at their records: 263,886 in the city, 385,410 in the county, with the Census Bureau's July 2025 estimate putting the city at 275,203 — an estimate, printed here as one, not a count.
Sources:
- The decennial census table in the preceding entry; all rates and shares are computed from it.
- City of Fort Wayne — the 2006 Southwest annexation and its 22,587 added residents, per the city's own 2016 statement of the annexation's effect; the annexation record itself is in Government.
- U.S. Census Bureau, Population Estimates Program — city population estimate of 275,203 for 1 July 2025 (Vintage 2025), an estimate and not a census count.
- Exports and Business sections of this history — the canal tonnage of 1848 and the factory record, cross-referenced and not retold here.