WATERLOO, a city of eastern Iowa, U.S.A., on the Cedar river, about 90 m. west of Dubuque and 275 m. west of Chicago. Pop. (192o) 36,230 (go% native white) ; 1930 Federal census 46,191. It is in a rich farming and stock-raising region, and is headquarters of the Dairy Cattle Congress and the National Belgian Horse Show. Among the manufactures are tractors, engines and dairy separators. The number of manufacturing establishments in 1927 was 88, the number of wage earners the value of products of which was added by the various manufacturing processes. The river here is 700 to goo ft. wide; its clear water flows over a limestone
bed through a rather evenly sloping valley in the middle of the city with enough fall to furnish valuable water power. The city is served by the Illinois Central (which has large construction and repair shops here), the Chicago, Rock Island and Pacific and the Chicago Great Western. The city was founded about 1846, laid out in 1854, and chartered in 1868. It doubled its population between 1890 and 1900, more than doubled it between 190o and 1910 and increased it 36% between 1910 and 192o.