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The first surviving map of the whole county is a hand-drawn sheet of 1846, held by the Indiana State Library and published in full through Indiana Memory. It shows the new civil order and the old one on the same page: the surveyed townships and the young settlements, and the tribal reservations still on the land in the year of the Miami removal. Griswold's Pictorial History of Fort Wayne (1917) carries the companion piece — an outline map of the county numbering twenty-nine Indian reservations granted under the treaties of October 1818 and October 1826, the parcels whose story the Tribes chapter tells.
By 1875 — twenty-nine years after the 1846 sheet — the county could support a commercial county map. Samuel Morrison's Map of Allen County, Indiana (1875) is a large wall map — the State Library's copy is a dissected map, mounted in sections — drawn, the library's description notes, with the railroads, churches, schools, and the canal: the four networks that organized a farm family's life. It is digitized through Indiana Memory, and the Library of Congress copy circulates through the Digital Public Library of America. A year later the county entered the state atlas trade: A. T. Andreas's Illustrated Historical Atlas of the State of Indiana, published at Chicago in 1876 by Baskin, Forster & Co., gave Allen County a full map and the city a map of its own showing wards, public buildings, and lot numbers, with inset plans of Cedarville, Sheldon, Arcola, and New Haven. The David Rumsey Collection holds the county sheet; the detached Fort Wayne sheets survive digitized at the Internet Archive in the Lincoln Financial Foundation Collection copy.
The era closes with a history that is half atlas. Thomas B. Helm's History of Allen County, Indiana (Kingman Brothers, Chicago, 1880) contains, its title page promises, maps of the county's several townships and villages "listing farms and their owners," together with a map of Fort Wayne and vicinity. The Allen County Public Library's copy is digitized at the Internet Archive. Between Morrison's wall map and Helm's subscription history, the county had become a place whose landowners expected to find their own names in print — the market every later plat book served.
Sources: Indiana State Library, Allen County Maps page, call numbers 912.772 IAl 46 (1846 county map), [Map Rm-L] ISLZ 912.772 IAL75 (1875 Morrison); Indiana Memory records for the 1846 and 1875 maps; B. J. Griswold, Pictorial History of Fort Wayne (1917), reservations outline map, via ACGSI treaties page; David Rumsey Collection, List No. 0019.038 (Andreas 1876, Allen County); Internet Archive items mapofcityoffortw00andr (Andreas, Fort Wayne sheets) and historicalatlasalle00unse (Helm, History of Allen County, 1880).