The King Iron Bridge & Manufacturing Company was a late-19th-century bridge building company located in Cleveland, Ohio. It was founded by Zenas King (1818–1892) in 1858 and subsequently managed by his sons, James A. King and Harry W. King and then his grandson, Norman C. King, until the mid-1920s. Many of the bridges built by the company were used during America's expansion west in the late 19th century and early 20th century, and some of these bridges are still standing today.
Niantic River Bridge (1907), New London County, Connecticut (1907, being replaced in 2010-2012), deemed NRHP-eligible in 1987 but not finally NRHP-listed due to owner objection
Robidoux Creek Pratt Truss Bridge (1910), Frankfort, Kansas, on Sunflower Road over Robidoux Creek, NRHP-listed[13]
Williams Street Bridge (1894), Helena, Montana, Williams St. crossing Ten Mile Creek, N of jct. of Williams St. and Broadwater Ave., NRHP-listed. Replaced by new bridge in 2010.
South Dakota Dept. of Transportation Bridge No. 29-221-060 (1894), Castlewood, South Dakota, local road over the Big Sioux River, NRHP-listed,[17] demolished and replaced 1999