Cities and Towns in Clark County, Idaho
Founded in 1919, Clark County is one of 44 counties in the state of Idaho. Historically, Clark County was formed from Fremont County. The city of Dubois is the county seat. With FIPS code of 33, Clark County has a population of 792 and area of 1,765 square miles (4,571 km²).
List of all cities in Clark County, ID alphabetically
| City/Town | Postal Code | Area Code |
| Argora, ID | 83423 | 208 |
| Dubois, ID | 83423 | 208 |
| 83446 | 208 | |
| Humphrey, ID | 83446 | 208 |
| Idman, ID | 83423 | 208 |
| Kilgore, ID | 83423 | 208 |
| Lidy Hot Springs, ID | 83423 | 208 |
| Reno, ID | 83423 | 208 |
| Small, ID | 83423 | 208 |
| Spencer, ID | 83446 | 208 |
Major Cities and Towns in Clark County, Idaho
Dubois
Area and Population
- Area: 1.15 square miles
- Population: Approximately 570
- Zip Codes: 83423
- Latitude: 44.1741° N
- Longitude: 112.2317° W
Location and History
Dubois is the county seat and largest town in Clark County, located in eastern Idaho near the Montana border. The town was established in the late 19th century and was named after Fred Dubois, an Idaho politician and U.S. Senator who was influential in the region’s development. Dubois served as a key stop on the Oregon Short Line Railroad, which contributed to its early growth as a transportation and agricultural center. The town is surrounded by vast stretches of high desert and rangeland, making it an important area for livestock grazing. Over the years, Dubois has maintained its rural character and remains a small, close-knit community with deep roots in ranching and agriculture.
Major Schools and Landmarks
Dubois is served by Clark County School District, with Clark County Junior/Senior High School and Dubois Elementary School being the main educational institutions. The town is known for its proximity to outdoor recreational areas, including the nearby Stoddard Creek Campground, which offers camping, fishing, and hiking opportunities in a scenic mountain setting. Another notable landmark is the Dubois Museum, which showcases the history and culture of the region, including exhibits on local ranching, pioneer life, and the railroad’s impact on the community. The vast open spaces and rugged landscapes surrounding Dubois make it a gateway to outdoor adventures in southeastern Idaho.
Spencer
Area and Population
- Area: 0.12 square miles
- Population: Approximately 37
- Zip Codes: 83446
- Latitude: 44.3647° N
- Longitude: 112.1861° W
Location and History
Spencer is a tiny town located north of Dubois in Clark County, near the Idaho-Montana border. The town was established in the early 20th century as a stop on the Union Pacific Railroad. Spencer is best known for its rich deposits of opal, earning it the title “Opal Capital of America.” The town’s economy has historically been centered around mining, particularly the extraction and sale of opal, which attracts gem enthusiasts and collectors from across the country. Despite its small size, Spencer has a unique place in Idaho’s mining history and continues to be a destination for those interested in gemstones and the natural beauty of the region.
Major Schools and Landmarks
Spencer is part of the Clark County School District, with students typically attending schools in Dubois. The town’s primary attraction is the Spencer Opal Mines, where visitors can mine their own opals and learn about the gemstone’s geology and history. The nearby Spencer Mountain offers hiking and wildlife viewing opportunities, providing a backdrop of rugged beauty that enhances the town’s charm. The Spencer Rock Shop and Cafe is another notable landmark, serving as a community hub where locals and visitors can purchase opals, enjoy a meal, and learn more about the area’s mining heritage.