Jefferson County, located in Idaho, has a population of 30,985 with a population density of 28 people per square mile. The population is predominantly White, with 23,844 individuals identifying as such. Other racial demographics in the county include 52 Black individuals, 203 American Indian or Alaska Native individuals, 103 Asian individuals, and 23 Native Hawaiian or Pacific Islander individuals. The Hispanic population in Jefferson County is 2,641, making up a significant portion of the total population. The county has a relatively young population, with a median age of 30, and a high average household size of 3.2. Additionally, the county has a high number of households (8,146) and families (6,698), indicating a strong sense of community.

In comparison to other counties in Idaho, Jefferson County stands out for its relatively low population density and large land area of 1,105.71 square miles. The county also has a high number of farms, with 776 reported in 2012 and 750 reported in 2017. The average farm size in 2012 was 416 acres, which increased to 445 acres in 2017. The total crop acreage also saw an increase from 191,074 acres in 2012 to 228,278 acres in 2017. The average farm sales in 2012 were $331,387, which increased to $392,742 in 2017, indicating growth in the agricultural sector. Overall, Jefferson County's demographics and economic indicators paint a picture of a rural community with a strong agricultural presence.

• Terreton
• Lewisville