Cities and Towns in Bonneville County, Idaho
Founded in 1911, Bonneville County is one of 44 counties in the state of Idaho. Historically, Bonneville County was formed from Bingham County. The city of Idaho Falls is the county seat. With FIPS code of 19, Bonneville County has a population of 127,930 and area of 1,869 square miles (4,841 km²).
List of all cities in Bonneville County, ID alphabetically
| City/Town | Postal Code | Area Code |
| Ammon, ID | 83401 | 208 |
| 83406 | 208 | |
| Beachs Corner, ID | 83401 | 208 |
| Bone, ID | 83401 | 208 |
| Coltman, ID | 83401 | 208 |
| Eagle Rock, ID | 83402 | 208 |
| Grant, ID | 83401 | 208 |
| Hillview, ID | 83401 | 208 |
| Idaho Falls, ID | 83401 | 208 |
| 83402 | 208 | |
| 83403 | 208 | |
| 83404 | 208 | |
| 83405 | 208 | |
| 83406 | 208 | |
| 83415 | 208 | |
| Idaho National Lab, ID | 83415 | 208 |
| Iona, ID | 83427 | 208 |
| Irwin, ID | 83428 | 208 |
| Lincoln, ID | 83401 | 208 |
| New Sweden, ID | 83401 | 208 |
| Osgood, ID | 83401 | 208 |
| Palisades, ID | 83428 | 208 |
| Saint Leon, ID | 83401 | 208 |
| Scoville, ID | 83415 | 208 |
| Shelton, ID | 83401 | 208 |
| Swan Valley, ID | 83449 | 208 |
| Taylor, ID | 83401 | 208 |
| Ucon, ID | 83454 | 208 |
Major Cities and Towns in Bonneville County, Idaho
Idaho Falls
Area and Population
- Area: 23.14 square miles
- Population: Approximately 64,818
- Zip Codes: 83401-83406
- Latitude: 43.4917° N
- Longitude: 112.0339° W
Location and History
Idaho Falls is the largest city in Bonneville County and serves as the county seat. It is located along the Snake River in southeastern Idaho, making it a key economic and cultural hub in the region. The city was initially known as Eagle Rock and was established in the 1860s as a crossing for the Snake River. With the arrival of the Utah and Northern Railway in 1879, the city began to grow, and its name was changed to Idaho Falls in 1891, reflecting the man-made falls created to control the river’s flow. Idaho Falls has since evolved into a vibrant community, known for its strong economy, which is supported by agriculture, energy, and healthcare sectors, as well as its beautiful parks and green spaces.
Major Schools and Landmarks
Idaho Falls is served by the Idaho Falls School District and the Bonneville Joint School District, with schools such as Idaho Falls High School and Skyline High School playing prominent roles in the community. The city is home to several landmarks, including the Idaho Falls River Walk, a scenic pathway that follows the Snake River and features views of the falls and the surrounding landscape. The Museum of Idaho, which offers exhibits on the region’s history and culture, is another key attraction. Additionally, the Idaho Falls Temple of The Church of Jesus Christ of Latter-day Saints is a significant landmark, known for its striking architecture and beautiful grounds.
Ammon
Area and Population
- Area: 7.35 square miles
- Population: Approximately 17,115
- Zip Codes: 83406
- Latitude: 43.4733° N
- Longitude: 111.9664° W
Location and History
Ammon is located directly adjacent to Idaho Falls, in the southeastern part of Bonneville County. The city was founded in 1888 and named after Ammon, a figure from the Book of Mormon, reflecting the area’s strong Latter-day Saints heritage. Ammon remained a small farming community for much of its history, but it has experienced rapid growth in recent decades, largely due to its proximity to Idaho Falls. The city has expanded its residential and commercial areas, becoming a popular suburban community with a family-friendly atmosphere and access to urban amenities.
Major Schools and Landmarks
Ammon is part of the Bonneville Joint School District, with Hillcrest High School and Ammon Elementary School serving the community. The city is known for its expanding retail centers, including the Ammon Town Center and Sandcreek Commons, which offer a variety of shopping, dining, and entertainment options. Ammon also boasts several parks, such as McCowin Park, which features sports fields, playgrounds, and picnic areas, making it a central gathering spot for residents.
Iona
Area and Population
- Area: 1.19 square miles
- Population: Approximately 2,318
- Zip Codes: 83427
- Latitude: 43.5288° N
- Longitude: 111.9299° W
Location and History
Iona is a small city located northeast of Idaho Falls in Bonneville County. The town was established in the late 19th century by Mormon pioneers and was named after the Scottish island of Iona, which holds religious significance. Iona began as an agricultural community, with farming and livestock being central to its economy. Over the years, the town has retained its rural charm while gradually developing into a suburban community with a strong sense of heritage and close-knit neighborhoods. Iona’s growth has been influenced by its proximity to Idaho Falls, providing residents with access to urban amenities while enjoying a quieter, small-town lifestyle.
Major Schools and Landmarks
Iona is served by the Bonneville Joint School District, with Iona Elementary School being a key educational institution in the town. The community is known for its peaceful residential areas and its historic sites, such as the Iona Community Center, which was originally built as a church and now serves as a venue for local events and gatherings. The nearby Bonneville County Fairgrounds, located just outside of Iona, hosts various events throughout the year, including the annual county fair, which is a significant cultural and social event for the region.
Ucon
Area and Population
- Area: 1.52 square miles
- Population: Approximately 1,108
- Zip Codes: 83401
- Latitude: 43.5966° N
- Longitude: 111.9619° W
Location and History
Ucon is a small city located northeast of Idaho Falls, in Bonneville County. The town was established in the early 20th century and named after the Union Congregational Church, which played a central role in the community’s founding. Ucon developed as an agricultural community, with farming and ranching being the primary economic activities. The town has maintained its rural character over the years, with a focus on community values and a strong connection to the land. Ucon’s proximity to Idaho Falls has allowed residents to enjoy the benefits of a rural lifestyle while having access to the amenities and opportunities of a larger city.
Major Schools and Landmarks
Ucon is part of the Bonneville Joint School District, with students attending schools in nearby communities, such as Ucon Elementary School and Bonneville High School. The town is known for its quiet, residential neighborhoods and its close-knit community. Ucon’s rural setting provides easy access to outdoor recreational activities, including hiking, fishing, and hunting in the surrounding areas. The town’s historic sites, such as the Ucon Pioneer Cemetery, reflect its deep roots in the region and its connection to the early settlers who helped shape the community.
Irwin
Area and Population
- Area: 0.57 square miles
- Population: Approximately 219
- Zip Codes: 83428
- Latitude: 43.4449° N
- Longitude: 111.2831° W
Location and History
Irwin is a small town located in eastern Bonneville County, near the Wyoming border, along the banks of the Snake River. The town was established in the early 20th century and developed primarily as a farming and ranching community. Irwin’s location in the scenic Snake River Valley, surrounded by mountains and forests, has made it a popular destination for outdoor enthusiasts. The town has remained small and rural, with a focus on agriculture and a peaceful way of life. Irwin’s natural beauty and proximity to the Snake River and the Caribou-Targhee National Forest make it an attractive location for those seeking a tranquil environment.
Major Schools and Landmarks
Irwin is served by the Bonneville Joint School District, with students typically attending schools in nearby towns such as Swan Valley. The town is known for its access to outdoor recreational activities, including fishing, boating, and camping along the Snake River. The nearby Palisades Reservoir, a large man-made lake, is a major landmark that offers opportunities for water sports, fishing, and picnicking. Additionally, the Caribou-Targhee National Forest provides extensive trails for hiking, horseback riding, and wildlife observation, making Irwin a gateway to some of Idaho’s most beautiful natural landscapes.
