I can find data back to 1900 and it seems the population has held very steady since then, in the 17,000 - 18,000 range. I would guess that the population was roughly 17,000 in 1880.
Jane E. Hall has written: '30 bicycle tours in Wisconsin' -- subject(s): Bicycle touring, Guidebooks 'Name index to The history of Waukesha County, Wisconsin, 1880' -- subject(s): Biography, History, Indexes, Wisconsin History of Waukesha County 'The Art and Embroidery of Jane Hall'
Sacred Heart College - Wisconsin - was created in 1880.
1880
Otsego County Courthouse was created in 1880.
Essex County Railroad ended in 1880.
Mary C. Moody has written: 'Every name index to the 1880 Leon County, Texas federal census' -- subject(s): Census, 10th, 1880, Census, 1880, Genealogy, Indexes, Registers of births 'Every name index to the 1880 Caldwell County, Texas federal census' -- subject(s): Census, 10th, 1880, Census, 1880, Genealogy, Indexes, Registers of births '1890 Limestone County, Texas, census' -- subject(s): Census, 11th, 1890, Census, 1890, Genealogy, Registers of births '1890 Caldwell County, Texas census, uniquely reconstructed & annotated' -- subject(s): Census, 11th, 1890, Census, 1890, Genealogy, Registers of births 'Every name index to the 1880 Walker County, Texas federal census' -- subject(s): Census, 10th, 1880, Census, 1880, Genealogy, Indexes, Registers of births 'Every name index to the 1880 Hamilton County, Texas federal census' -- subject(s): Census, 10th, 1880, Census, 1880, Genealogy, Indexes, Registers of births 'Every name index to the 1880 Montgomery County, Texas federal census' -- subject(s): Census, 10th, 1880, Census, 1880, Genealogy, Indexes, Personal Names, Registers of births '1890 Montgomery County, Texas census uniquely reconstructed & annotated' -- subject(s): Census, 11th, 1890, Census, 1890, Genealogy, Registers of births
less than 2000
Janice Roseberry has written: '1880 census, Sullivan County, Indiana' -- subject(s): Census, 10th, 1880, Census, 1880, Genealogy, Registers of births
1850-1880 the population went from 11,000 to 145,000. 1880-1910 the population went from 145,000 to 375,000. 1910-1940 the population went from 375,000 to 550,000. 1940-1970 the population went from 550,000 to 1,050,000. 1970-present the population went from 1,050,000 to 2,800,000.
1850-1880 the population went from 12,000 to 175,000. 1880-1910 the population went from 175,000 to 670,000. 1910-1940 the population went from 670,000 to 1,100,000. 1940-1970 the population went from 1,100,000 to 2,100,000. 1970-2010 the population went from 2,100,000 to 3,800,000.
1800-1840 the population went from 4,000 to 210,000. 1840-1880 the population went from 210,000 to 1,625,000. 1880-1920 the population went from 1,625,000 to 3,675,000. 1920-1960 the population went from 3,675,000 to 7,800,000. 1960-present the population went from 7,800,000 to 9,900,000.
1850-1880 the population went from 190,000 to 320,000. 1880-1910 the population went from 320,000 to 350,000. 1910-1940 the population went from 350,000 to 460,000. 1940-1970 the population went from 460,000 to 630,000. 1970-present the population went from 630,000 to 750,000.