Rigby is a small city in and the county seat of Jefferson County, Idaho, United States. The population was 3,945 at the 2010 census, up from 2,998 in 2000.
Rigby was founded by members of The Church of Jesus Christ of Latter-day Saints in 1884 and incorporated in 1903. The community was named after William F. Rigby, a prominent early settler and member of the church. A significant majority of Rigby's residents, as well as those of the outlying communities, are members of the Church of Jesus Christ of Latter-Day Saints. Baptist, Presbyterian, and Lutheran faiths also have current local congregations.
Rigby is located at 43°40′26″N 111°54′59″W (43.673842, -111.916310), at an elevation of 4,856 feet (1,480 m) above sea level.
According to the United States Census Bureau, the city has a total area of 2.36 square miles (6.11 km2), of which, 2.35 square miles (6.09 km2) is land and 0.01 square miles (0.03 km2) is water.
The larger "Rigby area" includes such outlying unincorporated communities as Annis, Garfield, Grant, Labelle, and Clark. Other nearby incorporated areas within Jefferson County include Menan, Roberts, Lewisville, and Ririe. Rigby is part of the Idaho Falls Metropolitan Statistical Area, and is located directly between the two larger Idaho cities of Idaho Falls and Rexburg, providing its residents with a wide variety of shopping, entertainment and cultural choices.
As of the census of 2010, there were 3,945 people, 1,328 households, and 994 families living in the city.