Jefferson County, Idaho
Jefferson County: county in Idaho, United States
About
Jefferson County is a county located in the U.S. state of Idaho. As of the 2010 census, the population was 26,140 and a population density of 9 people per km². After 9 years in 2019 county had an estimated population of 29,871 inhabitants. Its county seat is Rigby. The county was created 113 years ago in 1913.
County Snapshot
Jefferson County at a glance
Jefferson County currently has 7 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
7
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
Idaho counties
44
Open related pagesLargest city
RigbyPopulation 4,292
Top linked places
Quick Facts about Jefferson County
| Population | 29,871 (2019) |
| Country | United States of America |
| State | Idaho (United States) |
| Different from | Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson Parish, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County |
| Twitter username | jeffersoncoid |
| Area | 2863 km2 |
| Water as percent of area | 1.1% |
| Land as percent of area | 98.9% |
| Latitude & Longitude | 43.8201,-112.3113 |
| Named for | Thomas Jefferson |
| Capital | Rigby |
| Establishment | February 18, 1913 |
| Time Zone | America/Boise |
| Local time | 01:02:54 (17th April 2026) |
| Density | 10 Pop. per km² as of 2019 |
| Population growth | 12.49% (2010-2019) |
Entering Grant Idaho image
Geography
Jefferson County is located at 43°49'13"N 112°18'41"W (43.8201400, -112.3112800). It has 6 neighbors: Bingham County, Bonneville County, Butte County, Clark County, Fremont County and Madison County.
Jefferson County map
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The largest city of Jefferson County is Rigby with a population of 4,292. Other cities include, Menan population 804, Ririe population 681, Roberts population 637 and Lewisville population 520. See all Jefferson County cities & populated places.
Jefferson County Populated Places
Cities, towns, neighborhoods & other populated places in Jefferson County.
| City Name | Population | Title |
|---|---|---|
| Rigby | 4,292 | City in Jefferson County, Idaho, United States |
| Menan | 804 | City in Jefferson County, Idaho, United States |
| Ririe | 681 | City in Idaho, United States |
| Roberts | 637 | City in Jefferson County, Idaho, United States |
| Lewisville | 520 | City in Jefferson County, Idaho, United States |
| Mud Lake | 419 | City in Jefferson County, Idaho, United States |
| Hamer | 104 | City in Jefferson County, Idaho, United States |
- Rigby
Demographics
The population of Jefferson County increased by 12.49% in 9 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 26,140 | - | census |
| 2011 | 26,313 | 0.66% | estimation process |
| 2012 | 26,641 | 1.23% | estimation process |
| 2013 | 26,804 | 0.61% | estimation process |
| 2014 | 26,944 | 0.52% | estimation process |
| 2015 | 27,127 | 0.67% | estimation process |
| 2016 | 27,830 | 2.53% | estimation process |
| 2017 | 28,439 | 2.14% | estimation process |
| 2018 | 29,405 | 3.29% | estimation process |
| 2019 | 29,871 | 1.56% | estimation process |
Comitatul Jefferson, Comte de Jefferson, Comté de Jefferson, Condado de Jefferson, Condado han Jefferson, Contea di Jefferson, Dzhefersun, Dzhefferson, Hrabstwo Jefferson, Jeferson srjan, Jefferson, Jefferson Kun, Jefferson Kūn, Jefferson konderria, Jefferson megye, Jeffersoni maakond, Okrug DZeferson, Quan Jefferson, Quận Jefferson, jefason jun, jepharasana ka'unti, jie fu xun xian, mqatʿt jyfyrswn, shhrstan jfrswn aydahw, Джеферсън, Джефферсон, Округ Џеферсон, Ջեֆերսոն շրջան, جیفرسن کاؤنٹی، اڈاہو, جیفرسن کاؤنٹی، ایڈاہو, شهرستان جفرسون، آیداهو, مقاطعة جيفيرسون, জেফারশন কাউন্টি, ジェファーソン郡, 傑佛遜縣
Other places with the same name (24)
- Jefferson County, Kentucky county in Alabama, United States with a population of 767,452 people.
- Jefferson County, Alabama county in Alabama, United States with a population of 655,342 people.
- Jefferson County, Colorado county in Colorado, United States with a population of 583,283 people.
- Jefferson County, Texas county in Texas, United States with a population of 250,127 people.
- Jefferson County, Missouri county in Missouri, United States with a population of 226,543 people.
- Jefferson County, New York county in New York, United States with a population of 108,095 people.
- Jefferson County, Wisconsin county in Wisconsin, United States with a population of 85,038 people.
- Jefferson County, Arkansas county in Arkansas, United States with a population of 65,377 people.
- Jefferson County, Ohio county in Ohio, United States with a population of 64,939 people.
- Jefferson County, West Virginia county in West Virginia, United States with a population of 57,486 people.
- Jefferson County, Tennessee county in Tennessee, United States with a population of 55,307 people.
- Jefferson County, Pennsylvania county in Pennsylvania, United States with a population of 43,108 people.
- Jefferson County, Illinois county in Illinois, United States with a population of 37,235 people.
- Jefferson County, Washington county in the state of Washington, United States with a population of 32,700 people.
- Jefferson County, Indiana county in Indiana, United States with a population of 32,110 people.
- Jefferson County, Oregon county in Oregon, United States with a population of 24,856 people.
- Jefferson County, Kansas county in Kansas, United States with a population of 19,032 people.
- Jefferson County, Iowa county in Iowa, United States with a population of 18,347 people.
- Jefferson County, Georgia county in Georgia, United States with a population of 15,267 people.
- Jefferson County, Florida county in Florida, United States of America with a population of 14,543 people.
- Jefferson County, Montana county in Montana, United States with a population of 12,360 people.
- Jefferson County, Nebraska county in Nebraska, United States with a population of 7,099 people.
- Jefferson County, Mississippi county in Mississippi, United States with a population of 6,997 people.
- Jefferson County, Oklahoma county in Oklahoma, United States with a population of 5,949 people.
Idaho Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Ada County | 481,587 | County in Idaho, United States |
| Canyon County | 229,849 | County in Idaho, United States |
| Boise | 228,959 | The capital of Idaho. |
| Kootenai County | 165,697 | County in Idaho, United States |
| Bonneville County | 119,062 | County in Idaho, United States |
| Meridian | 114,161 | The most populous city in Ada County, Idaho. |
| Nampa | 99,277 | The most populous city in Canyon County, Idaho. |
| Bannock County | 87,808 | County in Idaho, United States |
| Twin Falls County | 86,878 | County in Idaho, United States |
| Idaho Falls | 62,888 | The most populous city in Bonneville County, Idaho. |
| Caldwell | 58,481 | The most populous city in Canyon County, Idaho. |
| Pocatello | 56,637 | The most populous city in Bannock County, Idaho. |
| Coeur d'Alene | 52,414 | A city in Kootenai County, Idaho. |
| Twin Falls | 50,197 | The most populous city in Twin Falls County, Idaho. |
| Bingham County | 46,811 | County in Idaho, United States |
| Bonner County | 45,739 | County in Idaho, United States |