Sullivan County lies in northern Missouri, where Milan provides the central road and administrative reference and smaller communities are spread across rolling agricultural uplands. Green City and Green Castle occupy the east, Humphreys the southwest, and Newtown and Harris the western side. Route 5 crosses Milan north to south, while Route 6 connects the central county east to west through Humphreys, Milan, and the Green City corridor. High-resolution map files are available for download in the section below.
This page separates those features into a general county map, a ranked city map, a terrain-and-water map, and an elevation map showing roughly 223 to 327 meters of relief. High-resolution JPG originals of all four can be downloaded together in one ZIP for enlargement, A3 printing, classroom materials, reports, or personal reference.
Table of Contents
Milan and the Routes 5–6 crossing organize the county road network
Milan is the easiest place to begin reading the general map. It sits near the center of Sullivan County where Route 5 and Route 6 cross, giving the town strong north-south and east-west connections. The Missouri Secretary of State’s current roster identifies Milan as the county seat, so it is also the main administrative reference.
Route 5 runs north from Milan toward Putnam County and continues south toward the county line. Route 6 crosses the county through Humphreys, Milan, and Green City before continuing east. Together the two highways provide a simple framework for locating most of the larger communities.
Route 129 follows the eastern side near the Green City and Green Castle area, while Route 139 provides the main western reference near Newtown and Harris. The western half contains fewer large town footprints, so route numbers and creek valleys are especially useful for orientation across the rural landscape.
Pollock appears north of the county, while Browning and Winigan provide references near the southern boundary. Osgood is visible to the west. These surrounding places help distinguish the county edge from the internal settlements without treating every nearby label as a Sullivan County city.
Milan leads six small communities spread across the county
The city map highlights Milan, Green City, Green Castle, Humphreys, Newtown, and Harris. The map index labels Milan with 1,859, Green City with 658, Green Castle with 332, Humphreys with 137, Newtown with 109, and Harris with 38. Milan is clearly the largest highlighted place, while the others remain small rural communities.
Milan sits near the center, Green City and Green Castle occupy the east, and Humphreys lies to the southwest. Newtown and Harris are near the western edge. The six places therefore serve as useful directional markers across a county where long stretches of farmland separate the communities.
Milan combines the highest city-index value with the county-seat role. Green City is the most useful eastern settlement reference near Route 6 and Route 129, while Green Castle lies farther east. Humphreys, Newtown, and Harris help locate the western and southwestern rural areas where the stream network becomes more prominent than urban development.
The general map also shows nearby places outside or close to the county boundary, including Osgood, Browning, and Pollock. The six-city view should therefore be used for quick internal orientation rather than as a complete list of every settlement visible on the broader map.
Locust Creek branches and Yellow Creek valleys divide the rolling uplands
The Locust Creek system is the strongest water reference through the central and western interior. West Locust Creek and East Locust Creek run for long distances through the county, while Little East Locust Creek and Panther Creek cut additional valleys between them. These channels explain much of the lower terrain west and southwest of Milan.
West Yellow Creek and East Yellow Creek occupy the eastern half and form long, roughly parallel drainage corridors. Mussels Fork lies farther east near the county edge. Because the eastern uplands are generally higher, these creek valleys stand out clearly as lower routes through the hills.
Medicine Creek and Muddy Creek provide western references, while Spring Creek and North Spring Creek cross the northeast. Sears Community Lake appears north of the center and Shatto Lake farther south. Sullivan County therefore depends more on a dense creek network and small lakes than on a single dominant river or large reservoir.
The terrain-and-water map is intended for geographic reference, not flood determination, depth analysis, navigation, parcel boundaries, or legal water boundaries. Small-stream and lake conditions can change with rainfall, so current flood or access decisions should rely on up-to-date official information.
Elevation ranges from about 223 to 327 meters
The elevation map reports an actual range of roughly 223 to 327 meters and a mean near 283 meters. Higher brown terrain is most extensive in the east and northeast, where closely spaced ridges are divided by numerous short tributary valleys. The eastern half is generally higher than the western side.
Lower green terrain spreads across the west and southwest. Medicine Creek and West Locust Creek follow especially clear low corridors, and several tributaries merge into broader lower areas toward the southern county. The Humphreys side and the western boundary therefore sit below much of the eastern upland.
The central county remains rolling rather than flat. East Locust Creek, West Yellow Creek, and their tributaries create alternating low corridors and higher ridges. Comparing the water and elevation maps makes the close relationship between the named creeks and the green lower terrain easy to see.
This county-scale elevation surface is useful for broad relief comparison, not for engineering, construction, drainage design, parcel-level elevation decisions, or survey-grade measurement. Site-specific work requires more detailed official elevation data or field surveying.
Compare the Milan road network with creek valleys and eastern hills
Start with Milan and Routes 5 and 6 when roads and settlement locations matter most. Green City and Green Castle lie to the east near Route 129, while Newtown and Harris sit near Route 139 on the western side. Humphreys gives another useful reference in the southwest.
For terrain, begin with West and East Locust Creek, then compare Yellow Creek, Medicine Creek, Mussels Fork, and Spring Creek. Switching to the elevation map shows that the western stream valleys occupy lower green terrain while the east rises into broader high ridges.
Sullivan County is shaped less by one major river or urban corridor than by small towns, rolling farmland, and a dense branching creek network. Milan’s highway crossing provides simple orientation, but the water and elevation maps reveal the stronger east-west terrain contrast that is easy to miss on the road map alone.
The downloadable JPG originals contain more pixels than the WebP previews embedded on the page, making them better for enlargement, A3 printing, classroom handouts, reports, and personal reference. They remain general-purpose maps, however. Legal boundaries, live road restrictions, current water conditions, and precise site elevations should always be checked against current official sources.
Frequently Asked Questions
Which roads are the easiest references in Sullivan County?
Routes 5 and 6 are the clearest starting points. Route 5 crosses Milan north to south, while Route 6 links Humphreys, Milan, and the Green City side from west to east. Routes 129 and 139 provide additional eastern and western references.
How much elevation change is shown across Sullivan County?
The elevation map shows an actual range of about 223 to 327 meters with a mean near 283 meters. Eastern and northeastern ridges are highest, while the Locust Creek and Medicine Creek valleys in the west and southwest are lower.
Which waterways are the best starting points on the terrain map?
Start with West Locust Creek and East Locust Creek through the central and western county. West and East Yellow Creek, Mussels Fork, and Medicine Creek provide additional references across the eastern and western drainage areas.
Map File Information
The download ZIP contains high-resolution JPG versions of the Sullivan County general map, city map, terrain-and-water map, and elevation map.
- File Type: JPG
Related Maps
Sources and References
Boundary and road reference data are supported by U.S. Census Bureau TIGER/Line, water features by USGS National Hydrography, and elevation data by the USGS 3D Elevation Program. Milan’s county-seat status is listed in the Missouri Secretary of State 2025–2026 Missouri Roster.
Green Map creates custom-edited map images using open geographic data sources such as geoBoundaries, Natural Earth, OpenStreetMap, and government open data. These maps are edited visual materials, not raw data files, and are provided for education, documents, presentations, and graphic reference.
