Jefferson County Idaho - Government Site
Population: 22,350
Area: 1095 square miles
County Seat: Rigby
Area Code(s) in use: 208
Time Zone: MST
Adjacent counties:
Bingham Bonneville Butte Clark Fremont Madison
Airport
Mud Lake Airport, Q B One Airport, Rigby Airport
Bend
Tie Bend
Canal
Alliance Canal, Bell Larsen Canal, Big Six Canal, Bungalow Canal, Burgess Canal, Butte Market Lake Canal, Clark Edwards Canal, Crystal Lake Canal, Deer Park Canal, Eagle Rock Canal, East Canal, East Labelle Canal, Enterprise Canal, Farmers Friend Canal, Hamer Ditch, Harrison Canal, Holly Canal, Independent Canal, Independent Ditch, Island Canal, Jackett Canal, Jefferson Canal, Long Island Canal, McCarthy Ditch, McKevitt Ditch, Miller Canal, Missionary Canal, Mitchell Ditch, North Lake Canal, North Parks Lewisville Canal, North Rigby Canal, North Rudy Canal, Owsley Canal, Park and Lemon Canal, Parks Lewisville Canal, Poitevin Ditch, Rays Lake Canal, Rigby Canal, Rigby Waste, Robison Canal, Rudy Canal, Scotts Slough Canal, Second Owsley Canal, Selck and Taylor Canal, Severson Canal, Sidehill Ditch, South Parks Lewisville Canal, South Rigby Canal, Vance Payne Canal, Wilkins Canal
Cemetery
Central Cemetery, Lewisville Cemetery
Church
Clark Ward Church
Civil
Jefferson County
Dam
Idaho Diversion Dam, Mud Lake Dam
Flat
Deer Parks
Gut
Butte Slough, Mallard Slough, Market Lake Slough, Oxbow Slough, Roberts Slough, Taylor Slough
Island
Butler Island, Kellers Island
Lake
Hamer Lake, Leavitz Pond, Muskrat Pond, North Lake, Rat Farm Pond, Rock Lakes, Two-way Pond, Willow Pond
Locale
Camas National Wildlife Refuge Headquarters, Kelly Canyon Ski Area, Rays Lake Pump
Park
Camas National Wildlife Refuge, Market Lake Wildlife Management Area
Pillar
Bertha Rock, Blanche Rock
Populated Place
Annis, Barlow, Bassett, Camas, Garfield, Grant, Hamer, Hawgood, Heise, Labelle, Level (historical), Lewisville, Lorenzo, Menan, Midway, Monteview, Mud Lake, Rigby, Ririe, Roberts, Rudy, Sage Junction, Terreton
Range
Lewisville Knolls, The Breaks
Reserve
Mud Lake Wildlife Management Area
Reservoir
Jefferson Reservoir, Johnston Lake, Market Lake, Mud Lake, Rays Lake, Sandhole Lake
Ridge
Little Grassy Ridge
School
Clark School, Garfield School, Grant School, Hamer Elementary School, Harwood Elementary School, Kinghorn Elementary School, Midway Elementary School, Midway High School (historical), Midway Middle School, Rigby Junior High School, Rigby Senior High School, Ririe Elementary School, Ririe Junior-Senior High School, Roberts Elementary School, Roberts Middle School, West Jefferson High School
Spring
East Springs, Heise Hot Springs, Hot Springs
Stream
Annis Slough, Beaver Creek, Camas Creek, Dry Bed, Emigrant Creek, Kettle Butte Drain, Lowder Slough, Scotts Slough, Spring Creek, Warm Creek
Summit
Antelope Butte, Beacon Butte, Bunker Hill, Camas Butte, Circular Butte, Clay Butte, Little Buttes, Mollys Nipple, Needle Butte, Raumaker Butte, Sand Mountain, Table Butte
Tower
KRIC-FM (Rexburg)
Valley
Kelly Canyon
Well
Buck Springs Wells, Holly Wells, Owsley Wells, Table Butte Well
| Race | Population |
| White |  21,842 |
| Mixed | 190 |
| American Indian | 146 |
| Black | 78 |
| Asian | 66 |
| Hawaiian & Pacific Islander | 28 |
| Additional population tables : | |
| State population table | |
| Idaho population by county | |