Here are the counts for parcels of land mapped, by the decade in which the corresponding land patents were issued: DecadeParcel-count 1840s861 1850s1352 1860s3 1870s1 1890s2 1900s11 1910s4 1930s32 1940s1 1960s1 What Cities and Towns are in Mahaska County, Iowa (and in this book)?.