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.
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. Many Rigby citizens commute to jobs in Rexburg or Idaho Falls, and a number of residents work for the federal government or federal contractors through the Idaho National Laboratory (INL), locally called "The Site".