Map of Monroe County - Monroe County is a county located in the U.S. state of Illinois. Monroe County Map showing cities, highways, important places and water bodies. Get Where is Monroe County located in the map, major cities in Monroe county, population, areas, and places of interest.
Monroe County Map, Illinois
About Monroe County Map, Illinois: The map showing the county boundary, county seat, major cities, highways, water bodies and neighbouring counties.
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Monroe County, Illinois
Monroe County is a county located in the U.S. state of Illinois. It's county seat is Waterloo. As per 2020 census, the population of Monroe County is 34932 people and population density is square miles. According to the United States Census Bureau, the county has a total area of 385 sq mi (997 km2). Monroe County was established on 1816.
Facts about Monroe County, Illinois
| Country | United States |
| State | Illinois |
| Region | Southwestern Illinois / Metro East |
| County Seat | Waterloo |
| Named After | James Monroe |
| Established | 1816 |
| Organized | 1816 |
| Coordinates | 38.27° N, 90.20° W |
| Total Area | ~398 sq mi |
| Land Area | ~385 sq mi |
| Water Area | ~13 sq mi |
| Population (2020) | ~34,962 |
| Population Rank | Mid-sized county in Illinois |
| Largest City | Waterloo |
| Main Industries | Agriculture, Manufacturing, Construction, Healthcare |
| Major Highways | Illinois Route 3, Illinois Route 156 |
| Time Zone | Central Time (UTC−06:00) |
| Known For | Historic German settlements, bluffs, Mississippi River border |
| Website | https://www.monroecountyil.gov |
Ctities in Monroe county
| City Name | Type | Population (2020) | Pop. Density | Area |
|---|---|---|---|---|
| Fults | Village | 28 | 528.3/sq mi (204.0/km2) | 0.053 sq mi (0.14 km2) |
| Hecker | Village | 429 | 1,695.7/sq mi (654.7/km2) | 0.253 sq mi (0.66 km2) |
| Maeystown | Village | 150 | 503.4/sq mi (194.3/km2) | 0.298 sq mi (0.77 km2) |
| Valmeyer | Village | 1,233 | 360.8/sq mi (139.3/km2) | 3.417 sq mi (8.85 km2) |
| Waterloo | City | 11,013 | 1,354.3/sq mi (522.9/km2) | 8.132 sq mi (21.06 km2) |
| Columbia | City | 10,999 | 1,067.6/sq mi (412.2/km2) | 10.303 sq mi (26.68 km2) |
Roads and Highways in Monroe County, Illinois
Monroe County is well-connected by highways that provide access to the St. Louis metropolitan area and southwestern Illinois.
- Interstate 255 – runs along the eastern edge, linking the county to St. Louis and surrounding suburbs
- Illinois Route 3 – runs north-south, connecting Columbia to Waterloo and Chester
- Illinois Route 156 – runs east-west, linking Waterloo to Red Bud and Sparta
- Illinois Route 159 – runs north-south, connecting the county to Belleville and surrounding communities
Neighboring Counties of Monroe County
- St. Clair County (north)
- Randolph County (south)
- Washington County (east)
- Jefferson County, Missouri (west)
- St. Louis County, Missouri (northwest)
Top Attractions in Monroe County, Illinois
Monroe County offers scenic landscapes, historic towns, and outdoor recreation near the Mississippi River.
- Waterloo Historic District – Features charming shops, restaurants, and historic buildings.
- Fort de Chartres State Historic Site – A restored French colonial fort with reenactments and tours.
- Columbia Bottom Conservation Area (nearby) – Offers trails, wildlife viewing, and river access.
- Salt Lick Point Land and Water Reserve – A scenic area with hiking trails and overlooks.
- Monroe County Courthouse – A historic landmark located in Waterloo.
- Paul Wightman Subterranean Nature Preserve – A unique cave preserve for guided tours.
- Monroe County Fairgrounds – Hosts local fairs and community events.
Distance from Monroe County to Nearby Cities
- Waterloo to St. Louis – 30 mi (48 km)
- Columbia to St. Louis – 15 mi (24 km)
- Waterloo to Belleville – 25 mi (40 km)
- Waterloo to Sparta – 35 mi (56 km)
- Waterloo to Carbondale – 75 mi (121 km)
FAQs about Monroe County
Monroe County is located in southwestern Illinois, near the Mississippi River and the St. Louis metropolitan area.
The county is known for its historic sites, scenic landscapes, and proximity to St. Louis.
Waterloo is the county seat and the largest city in Monroe County.
Yes, visitors can enjoy parks, trails, nature preserves, and outdoor recreation throughout the county.
Monroe County is accessible via Interstate 255 and several Illinois state highways including Routes 3, 156, and 159.
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