Cities and Towns in Clark County, Illinois
Founded in 1819, Clark County is one of 102 counties in the state of Illinois. Historically, Clark County was formed from Crawford County. The city of Marshall is the county seat. With FIPS code of 23, Clark County has a population of 15,300 and area of 501 square miles (1,298 km²).
List of all cities in Clark County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Albright, IL | 62441 | 217 |
| Casey, IL | 62420 | 217 |
| Clark Center, IL | 62441 | 217 |
| Clarksville, IL | 62441 | 217 |
| Cleone, IL | 62442 | 217 |
| Dennison, IL | 62423 | 217 |
| Marshall, IL | 62441 | 217 |
| Martinsville, IL | 62442 | 217 |
| Moonshine, IL | 62442 | 217 |
| Neadmore, IL | 62442 | 217 |
| Oliver, IL | 62441 | 217 |
| Parker, IL | 62474 | 217 |
| West Union, IL | 62477 | 217 |
| Westfield, IL | 62474 | 217 |
Major Cities and Towns in Clark County, Illinois
Marshall
Area, Population, and Zip Codes
- Area: 3.74 square miles
- Population: 3,771 (2023 estimate)
- Zip Codes: 62441
- Latitude: 39.3900° N
- Longitude: 87.6937° W
Location and History
Marshall, the county seat of Clark County, is located in east-central Illinois, near the Indiana border and along Interstate 70. Founded in 1835, Marshall grew as a transportation and trade hub, benefiting from its location along the National Road, one of the first major highways in the United States. The town was named after John Marshall, the fourth Chief Justice of the United States, and it played an essential role in early Illinois history. The arrival of the railroad in the mid-19th century helped solidify Marshall’s position as a regional center for commerce and agriculture. Today, Marshall is known for its historic downtown, where many 19th-century buildings remain intact, contributing to its small-town charm.
Major Schools and Landmarks
Marshall is served by Marshall Community Unit School District 2C, with Marshall High School as the primary public school. Major landmarks in the city include the Clark County Courthouse, a historic structure that serves as the heart of the town’s civic life. The Harlan Hall and Archer House, both listed on the National Register of Historic Places, offer glimpses into the town’s rich history. Marshall is also home to the Lincoln Trail State Park, a popular spot for outdoor activities like hiking, fishing, and camping. The town’s annual Marshall Autumn Fest brings the community together for parades, craft fairs, and local entertainment.
Casey
Area, Population, and Zip Codes
- Area: 2.16 square miles
- Population: 2,632 (2023 estimate)
- Zip Codes: 62420
- Latitude: 39.2992° N
- Longitude: 87.9906° W
Location and History
Casey is located in the southern part of Clark County, along U.S. Route 40 and close to Interstate 70. Founded in 1853, Casey grew as a small agricultural community and thrived with the arrival of the Vandalia Railroad in the late 19th century, which helped the town become a local hub for trade and commerce. Over time, Casey has gained fame for its collection of Guinness World Record-certified “big things,” including the world’s largest wind chime, rocking chair, and mailbox, turning the town into a tourist destination. While agriculture remains central to Casey’s economy, tourism has become an important part of its identity in recent years.
Major Schools and Landmarks
Casey is part of the Casey-Westfield Community Unit School District 4C, with Casey-Westfield High School serving the area. The town’s major landmarks include its collection of world-record structures, such as the World’s Largest Wind Chime, Rocking Chair, and Teeter Totter, all of which attract visitors from across the region. Fairview Park is a popular spot for recreation, featuring playgrounds, picnic areas, and a public pool. The Casey Popcorn Festival is held annually, celebrating the town’s agricultural heritage with parades, live music, and local food, drawing both residents and visitors.
Martinsville
Area, Population, and Zip Codes
- Area: 1.03 square miles
- Population: 1,120 (2023 estimate)
- Zip Codes: 62442
- Latitude: 39.3298° N
- Longitude: 87.8800° W
Location and History
Martinsville is located in the western part of Clark County, along U.S. Route 40. The town was established in 1833 and named after its founder, Joseph Martin. Martinsville grew as an agricultural community, with local farmers producing corn, soybeans, and wheat. The town’s development was further boosted by the construction of the railroad in the mid-19th century, which helped to transport local agricultural products to larger markets. Although small in size, Martinsville has retained its rural charm and serves as a close-knit community with deep ties to farming and local traditions.
Major Schools and Landmarks
Martinsville is part of Martinsville Community Unit School District 3C, with Martinsville High School serving the student population. One of the town’s key landmarks is the Martinsville Public Library, a historic building that has served the community since the early 20th century. Linwood Park offers a venue for outdoor recreation, with sports fields, picnic areas, and a playground. The town’s annual Martinsville Agricultural Fair is one of the oldest in the area and celebrates the local farming community with livestock shows, tractor pulls, and carnival rides, drawing visitors from across the region.
Westfield
Area, Population, and Zip Codes
- Area: 0.32 square miles
- Population: 545 (2023 estimate)
- Zip Codes: 62474
- Latitude: 39.4553° N
- Longitude: 87.9961° W
Location and History
Westfield is located in the northern part of Clark County, about 20 miles northwest of Marshall. Founded in the mid-19th century, Westfield grew as a small farming village, with its economy centered around agriculture. The town was originally named “The Settlement,” but was later renamed Westfield due to its location west of the nearby larger communities. Over time, Westfield has remained a small, rural village, with a population that has fluctuated but never grown significantly. Today, it is known for its quiet, small-town atmosphere and its agricultural heritage.
Major Schools and Landmarks
Westfield is part of the Casey-Westfield Community Unit School District 4C, and students attend schools in nearby Casey. The town’s landmarks include the Westfield Historical Society, which preserves local history through exhibits on the early settlers and farming practices of the region. Westfield Park provides outdoor spaces for recreation and community events, featuring picnic areas and sports fields. Each year, the town hosts the Westfield Old Settlers Days, a festival that celebrates the town’s founding with parades, food vendors, and live music, offering a glimpse into the village’s deep-rooted sense of community and history.
Clarksville
Area, Population, and Zip Codes
- Area: 0.10 square miles
- Population: 290 (2023 estimate)
- Zip Codes: 62426
- Latitude: 39.3728° N
- Longitude: 87.6622° W
Location and History
Clarksville is a small village located in northeastern Clark County, near the Indiana border and just north of Marshall. The village was founded in the early 19th century and named after the county itself, reflecting its role as a local settlement. Clarksville developed primarily as an agricultural community, with small farms producing a variety of crops, including corn and soybeans. Over the years, the village has remained small, with a population that has never grown significantly beyond its early settlers. Today, Clarksville is known for its peaceful rural setting and strong agricultural roots.
Major Schools and Landmarks
Clarksville is part of Marshall Community Unit School District 2C, and students attend schools in nearby Marshall. The village’s primary landmark is Clarksville Community Church, a historic church that serves as a focal point for local gatherings and religious services. Although small, the village hosts local events, such as community picnics and church fairs, that bring residents together. Clarksville Park offers a modest outdoor area for recreation and socializing, contributing to the village’s close-knit atmosphere. Its rural landscape and agricultural heritage continue to define Clarksville’s identity as a quiet farming community.
