<page_title> Janesville, Iowa </page_title> <section_title> Demographics </section_title> <table> <cell> 1900 <col_header> Historical populations </col_header> <col_header> Year </col_header> </cell> <cell> 311 <col_header> Historical populations </col_header> <col_header> Pop. </col_header> <row_header> 1900 </row_header> </cell> <cell> Source:"American FactFinder". United States Census Bureau. and Iowa Data Center Source: U.S. Decennial Census <col_header> Historical populations </col_header> <col_header> Year </col_header> <col_header> Pop. </col_header> <col_header> ±% </col_header> <col_header> 1900 </col_header> <col_header> 1910 </col_header> <col_header> 1920 </col_header> <col_header> 1930 </col_header> <col_header> 1940 </col_header> <col_header> 1950 </col_header> <col_header> 1960 </col_header> <col_header> 1970 </col_header> <col_header> 1980 </col_header> <col_header> 1990 </col_header> <col_header> 2000 </col_header> <col_header> 2010 </col_header> <col_header> 1880 </col_header> <col_header> 2016 </col_header> </cell> </table>
Janesville had a population of 311 in 1900, according to the Iowa Data Center.