Dauphin County stretches from the Harrisburg urban area along the Susquehanna River into a much more mountainous northern landscape of long ridges and narrow valleys. Harrisburg, Steelton, Highspire, Middletown, and Hummelstown occupy the lower southern half, while Millersburg, Elizabethville, Lykens, Berrysburg, and Gratz are scattered through northern valleys. I-81, I-83, U.S. 322, U.S. 22, PA 283, U.S. 209, and PA 25 provide the strongest road references. The four map files on this page are also available as original A3 high-resolution JPG downloads below.
The Susquehanna River is the easiest geographic anchor. It follows much of the western edge and passes directly beside the Harrisburg–Steelton–Highspire corridor. North of the capital region, however, the county becomes a sequence of elongated Appalachian ridges cut by Wiconisco Creek, Clarks Creek, Stony Creek, and many smaller streams. The resulting contrast between southern lowlands and northern mountain valleys defines nearly every map in the set.
Table of Contents
Harrisburg and Middletown occupy the broad Susquehanna lowland
Harrisburg is the clearest starting point on the general reference map. The county seat and Pennsylvania state capital sits on the east bank of the Susquehanna River, with I-81, I-83, U.S. 22, and PA 283 providing major regional connections. Penbrook lies just east of the city, while Steelton and Highspire extend southeast along the river corridor.
Middletown continues that southern settlement belt near U.S. 230 and PA 283. Farther inland, Hummelstown and the Derry Township area form another important cluster east of Harrisburg. The road map also marks public-service locations in this southeastern section, which helps distinguish it from the more sparsely settled ridges and valleys farther north.
North of Harrisburg, U.S. 322 and PA 325 lead toward the community of Dauphin and the mountain interior. U.S. 11 and PA 147 remain close to the Susquehanna on the western side. Road spacing increases quickly beyond the capital area because the long ridges leave fewer broad corridors for highways and continuous settlement.
The six ranked communities are concentrated almost entirely in the south
The ranked community map highlights Harrisburg, Middletown, Steelton, Hummelstown, Penbrook, and Highspire. The values printed in the supplied graphic are Harrisburg 50,287, Middletown 9,632, Steelton 6,296, Hummelstown 4,527, Penbrook 3,266, and Highspire 2,732. These figures explain the ranking used on the graphic; readers who need the newest official population estimate should consult current Census Bureau releases.
All six ranked places appear in the southern part of the county. Harrisburg and Penbrook form the northern end of that cluster, while Steelton, Highspire, and Middletown continue down the Susquehanna corridor. Hummelstown sits farther east and slightly inland, but it still belongs to the denser southern settlement system rather than the northern mountain valleys.
The upper two-thirds of the ranked map therefore looks almost empty. Communities such as Millersburg, Elizabethville, Lykens, Berrysburg, and Gratz are real local centers, but they are smaller and spread among narrow valleys. Comparing the city map with elevation makes the reason clear: the north has much less continuous low ground available for large urban development.
The Susquehanna and Wiconisco Creek organize the county’s western and northern drainage
The Susquehanna River dominates the terrain-and-water map. It follows the western edge past Millersburg, Dauphin, Harrisburg, Steelton, Highspire, and Middletown, creating the county’s broadest and lowest water corridor. Because the county boundary follows the river for long stretches, the Susquehanna is also the clearest reference for separating Dauphin County from communities to the west.
Wiconisco Creek is the defining northern stream. It bends across the northern valley toward Millersburg, while Armstrong Creek drains nearby uplands and valley floors. The relationship between these streams and the long ridges explains why Elizabethville, Lykens, Berrysburg, and Gratz occupy separate pockets of lower terrain instead of forming one continuous town corridor.
The middle of the county contains two strikingly parallel drainage corridors. Clarks Creek and Stony Creek run between long ridges, with Dehart Reservoir marking the eastern part of the Clarks Creek valley. These streams create a broad mountain barrier between the Harrisburg metropolitan area and the Wiconisco Valley communities.
In the south, Paxton Creek reaches the Harrisburg area near Wildwood Lake and Italian Lake. Beaver Creek and Spring Creek drain the southeastern interior, while Middletown Reservoir and Lisa Lake provide local water landmarks near the lower county. The map is intended for geographic reference and should not be used to determine flood zones, water depth, navigation conditions, or reservoir operations.
Elevation ranges from about 24 to 538 meters
The elevation map shows an actual range of roughly 24 to 538 meters and a mean near 203 meters. Dark green lowlands follow the Susquehanna River and spread across much of the Harrisburg–Middletown southern area. Farther north, yellow and brown ridges repeat in long, narrow bands and create a much more mountainous landscape.
The most distinctive feature is the parallel alignment of those ridges. Rather than appearing as isolated hills, they extend northeast to southwest across the county, with Clarks Creek and Stony Creek occupying lower corridors between them. Similar ridge-and-valley terrain continues into the Wiconisco Valley area, where communities are restricted to narrow strips of lower ground.
Southern Dauphin County is much lower and more open. Hummelstown and the southeastern interior contain rolling hills, but the relief is gentler than the central mountain belt. This broader lowland helps explain why interstates, state highways, and larger communities are concentrated near Harrisburg and Middletown.
The elevation surface is suitable for county-wide comparison, not survey-grade measurement. Property, bridge, construction, drainage, or engineering work requires authoritative elevation data or professional surveying rather than the generalized values shown here.
Millersburg, Elizabethville, and Lykens form a separate Wiconisco Valley region
Millersburg sits near the place where Wiconisco Creek reaches the Susquehanna River and is one of the best reference points for northern Dauphin County. U.S. 209, PA 147, and PA 25 serve the area, while Elizabethville lies farther east inside the Wiconisco Valley. Berrysburg and Gratz occupy nearby parts of the same broader northern region.
Lykens is farther east and is reached along the U.S. 209 side of the valley. Wiconisco Creek and smaller tributaries provide the low corridors, while long ridges rise immediately to the north and south. On the elevation map, these communities sit in green or lighter bands surrounded by higher terrain rather than on ridge crests.
The northern county therefore makes more sense when read as a chain of valley communities rather than as a continuation of Harrisburg. Millersburg acts as the river-side entrance to the valley, and Elizabethville and Lykens continue inland. Once that relationship is clear, the directions of U.S. 209, PA 25, and PA 225 become much easier to follow.
Clarks Creek and Stony Creek create the mountain divide through central Dauphin County
Central Dauphin County contains relatively few large settlements, but it is one of the most important parts of the physical geography. Clarks Creek and Stony Creek occupy long valleys separated by parallel ridges, producing a broad mountain zone between the Harrisburg lowlands and the northern Wiconisco region.
Dehart Reservoir appears in the eastern part of the Clarks Creek corridor and provides a useful landmark within this otherwise sparsely settled area. PA 443 crosses the eastern side of the mountain region, while PA 325 approaches from north of Harrisburg. Direct routes are limited because repeated ridges force roads to use valleys and lower gaps.
This terrain explains the sharp difference between northern and southern settlement maps. Harrisburg has a dense road network, and Wiconisco Valley has its own chain of small towns, but the long mountain ridges between them leave a large area with relatively little concentrated development.
Harrisburg’s riverfront location links county history with Pennsylvania’s capital
Dauphin County’s official history states that the county was established on March 4, 1785, with the seat of government and justice placed near Harris’s Ferry. The name Dauphin honored the heir to the French throne, reflecting French assistance to the American colonies during the Revolution. Harrisburg later became the established city name and today serves as both the county seat and Pennsylvania’s state capital.
The original settlement story is inseparable from the Susquehanna River. The county history describes John Harris establishing a ferry that became an important crossing and trading location. The modern map still shows Harrisburg occupying the same broad river lowland, now surrounded by I-81, I-83, U.S. 22, and PA 283 instead of ferry and wagon routes.
Fort Hunter Park north of the city provides another riverfront historical reference. Dauphin County describes the site as a former frontier fort, commercial hub, and private estate on a bluff overlooking the Susquehanna. The present map set focuses on roads and physical geography, but the park’s location reinforces the historical importance of the river corridor.
Hummelstown and the southeast occupy lower rolling terrain east of Harrisburg
Hummelstown provides the strongest ranked-community reference east of Harrisburg. The general map shows it in the southeastern interior near the U.S. 322 corridor and the Derry Township side. Unlike Steelton or Middletown, it is not directly on the Susquehanna, so it represents a separate inland part of the southern settlement system.
Beaver Creek and Spring Creek drain this area through rolling terrain. Elevation is generally lower than in the central mountain belt, although local hills and shallow valleys remain common. Roads curve with those features as they continue toward Lebanon County and the southeastern county line.
Hummelstown and Middletown can be easy to confuse by name, but they occupy different corridors. Hummelstown is east of Harrisburg in the interior, while Middletown lies farther south near the Susquehanna and the U.S. 230/PA 283 side. Keeping those road references separate makes the southeastern map much easier to read.
Blue Mountain forest shows how sharply the county rises north of the capital region
Pennsylvania DCNR describes Boyd Big Tree Preserve Conservation Area as a 1,025-acre property straddling Blue Mountain in Dauphin County. The preserve protects large trees and deep-forest habitat and is reached from U.S. 322 via the Fishing Creek exit and PA 443.
The preserve provides a useful real-world example of the terrain shown on the elevation map. Moving north and northeast from the Harrisburg lowlands, elevation rises quickly onto long forested ridges. Those ridges flank the Clarks Creek and Stony Creek valleys and help form the physical divide between the capital region and the northern valleys.
DCNR manages the area for open-space protection, natural resources, and low-density recreation. The county maps do not show every preserve boundary, but the official location helps connect the PA 443 corridor with the Blue Mountain landscape visible in the relief and elevation layers.
Choose the map according to the part of Dauphin County you need to understand
The general reference map is the quickest choice for roads and settlements. It combines Harrisburg, Steelton, Highspire, Middletown, Hummelstown, Millersburg, Lykens, I-81, I-83, U.S. 322, U.S. 22, PA 283, and U.S. 209 in one view. The ranked community map is better for comparing settlement size and seeing how strongly the major population centers are concentrated in the south.
The terrain-and-water map is more useful for the Susquehanna River, Wiconisco Creek, Armstrong Creek, Clarks Creek, Stony Creek, Dehart Reservoir, Wildwood Lake, and the smaller southern drainage. The elevation map removes many labels and makes the Harrisburg lowland and long central-northern ridges especially easy to compare.
For printed handouts, classroom use, regional reference notes, or presentation slides, the A3 high-resolution JPG files in the download archive will remain sharper than enlarged web previews. Pairing the general and elevation maps works well for roads and relief, while the community and water maps make the contrast between the Harrisburg urban corridor and the northern valleys especially clear.
Frequently Asked Questions
What is the easiest way to separate southern and northern Dauphin County on the map?
Use Harrisburg, the Susquehanna River, I-81, and I-83 for the southern region, then use Millersburg, Wiconisco Creek, and U.S. 209 for the north. Between them, the Clarks Creek and Stony Creek valleys are separated by long mountain ridges, creating a clear geographic break.
Why are the largest ranked communities concentrated around Harrisburg?
The Harrisburg-to-Middletown corridor occupies broad, low terrain beside the Susquehanna and has the county’s densest highway network. Central and northern Dauphin County contains repeated Appalachian ridges, leaving much less continuous lowland for large urban development.
Where is Dehart Reservoir and why is it useful as a map landmark?
Dehart Reservoir lies in the central-eastern part of the county along the Clarks Creek valley. It is a useful reference for the sparsely settled mountain zone between the Harrisburg area and the Wiconisco Valley because it sits among the parallel central ridges.
Map File Information
The download ZIP contains four A3 high-resolution JPG files: the Dauphin County general reference map, ranked community map, terrain-and-water map, and elevation map. These original files are larger than the web previews and are better suited to printing, classroom handouts, regional reference work, and presentation slides.
- Included Files: Use only the versions confirmed in the article and supplied images
- File Type: Use the confirmed download contents
- Intended Use: Printing, education, presentations, and map-based projects
Related Maps
Sources and References
- Dauphin County official history: county formation, Harris Ferry, Harrisburg, and the origin of the county name.
- Dauphin County – Fort Hunter Park: official information on the historic Susquehanna River site north of Harrisburg.
- Pennsylvania DCNR – Boyd Big Tree Preserve Conservation Area: Blue Mountain forest, conservation area, and access information.
- U.S. Census Bureau TIGER/Line Shapefiles: county boundaries and transportation geography.
- USGS National Hydrography: rivers, streams, lakes, and reservoir data.
- USGS 3D Elevation Program: elevation data and 3DEP documentation.
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.
