Midvale is a city in Washington County, Idaho, United States. The population was 171 at the 2010 census.
The city was named when the valley in which it stands was called Middle Valley. The first settlers came in 1868 and in 1876 a post office and school were begun. In 1884 the Middle Valley Ditch was undertaken: in 1885 the first store was built, and in 1898 the P&IN Rail Road came through. From 1870 to 1900 stock raising was the chief industry, but today Midvale serves a diversified farming area. Midvale is the hometown of former U.S. Senator Larry Craig.
Midvale is at an elevation of 2,543 feet (775 m) above sea level.
According to the United States Census Bureau, the city has a total area of 2.87 square miles (7.43 km2), of which 2.79 square miles (7.23 km2) is land and 0.08 square miles (0.21 km2) is water.
As of the census of 2010, there were 171 people, 77 households, and 50 families residing in the city. The population density was 61.3 inhabitants per square mile (23.7/km2). There were 100 housing units at an average density of 35.8 per square mile (13.8/km2).