Franklin County occupies a long section of south-central Pennsylvania where the broad Cumberland Valley is framed by mountain ridges on both sides. Chambersburg sits near the center, I-81 runs north to south through the valley, and U.S. 30 crosses the county from Fort Loudon through Chambersburg toward South Mountain. Greencastle and Waynesboro anchor the south, Shippensburg lies near the northeastern boundary, and Mercersburg sits close to the western mountain front. The four original A3 high-resolution JPG maps are available in the download box below.
The county’s physical geography is easiest to understand as a low central corridor bordered by higher ground. Conococheague Creek and Back Creek drain much of the valley, while Antietam Creek serves the southeastern side. Tuscarora Mountain rises along the west, and South Mountain forms the high eastern edge. The supplied elevation map ranges from about 124 to 748 meters, making the valley-to-ridge contrast especially clear.
Table of Contents
Chambersburg sits where the county’s main road corridors come together
Chambersburg is the best starting point on the general reference map. I-81 passes close to the borough, U.S. 30 crosses east to west, and U.S. 11 provides another north-south route through the valley. Eastbound U.S. 30 leads toward Fayetteville and South Mountain, while the western route continues toward Fort Loudon and the mountain gaps.
South of Chambersburg, I-81 runs through Marion and Greencastle toward State Line and Maryland. Greencastle also connects east toward the Waynesboro area, where PA 16, PA 316, PA 997, and PA 64 organize the southeastern road network. The road density is greatest on the lower valley floor and becomes thinner as the terrain rises.
Shippensburg lies near the northeastern county boundary and shares a regional relationship with neighboring Cumberland County. U.S. 11, PA 533, and PA 433 serve the area, while PA 641 and PA 274 continue through the northern county. The valley narrows toward this end, with long ridges approaching more closely from both sides.
Chambersburg ranks first, followed by Waynesboro and Shippensburg
The ranked community map highlights Chambersburg, Waynesboro, Shippensburg, Greencastle, Mercersburg, and Mont Alto. The values printed on the supplied graphic are Chambersburg 22,319, Waynesboro 11,047, and Shippensburg 5,620. Greencastle follows at 4,222, Mercersburg at 1,725, and Mont Alto at 1,632. These are the ranking values used on the map and should not be treated as substitutes for the newest official population estimates.
Chambersburg is both the largest ranked center and the county seat. Waynesboro forms a strong southeastern center near the South Mountain foothills, while Greencastle lies directly on the I-81 side of the southern valley. Mont Alto is smaller but provides another useful reference between the Chambersburg and Waynesboro areas.
Shippensburg appears in the northeastern part of the map near the Cumberland County boundary. Mercersburg sits farther west near the mountain front. Taken together, the ranked communities show a clear preference for the valley floor and lower foothill zones rather than the highest ridges.
Conococheague Creek and Back Creek drain the broad central valley
Conococheague Creek is one of the strongest water references in Franklin County. It crosses the central and southern valley and continues toward Maryland, while West Branch Conococheague Creek follows a lower corridor closer to the western mountain front. These waterways help define the broad agricultural lowland between the mountain ridges.
Back Creek follows another long drainage through the central and southern county. Antietam Creek marks the Waynesboro side in the southeast, while Licking Creek lies in the southwest. Broad Run and numerous smaller tributaries descend from the foothills toward the main valley channels.
Several reservoirs and lakes provide useful local landmarks. Letterkenny Reservoir and Gunter Valley Reservoir lie in the north-central county, while Lake Letterkenny and Rocky Spring Lake appear closer to the Chambersburg side. Greencastle Reservoir provides a southern reference, and Mountain Lake lies closer to the western ridges.
The terrain-and-water map is designed for geographic reference. It does not establish flood zones, water depth, water quality, reservoir operating conditions, or navigation suitability, so those questions require current information from the appropriate agencies.
Elevation ranges from about 124 to 748 meters
The supplied elevation map reports an actual range of roughly 124 to 748 meters and a mean near 272 meters. Broad green lowlands cover the Chambersburg–Greencastle corridor and much of the central valley. Long brown ridges rise sharply along the western edge, and another high belt appears on the South Mountain side to the east.
The western mountain front contains several long, parallel ridges associated with the Tuscarora Mountain side of the Appalachians. Fort Loudon and Mercersburg sit near lower passages at the base of that high terrain. West Branch Conococheague Creek follows the foothill corridor, making the water and elevation maps especially useful when viewed together.
On the eastern side, South Mountain rises beyond Fayetteville and Mont Alto. The terrain east of Chambersburg changes quickly from broad valley floor to high ridge country, and the same pattern continues toward the Waynesboro side. Caledonia State Park lies within this eastern highland along U.S. 30.
The elevation surface is intended for county-wide comparison rather than survey-grade measurement. Parcel, construction, drainage, bridge, or engineering work requires authoritative elevation data or professional surveying.
Chambersburg has served as the county seat since Franklin County was created in 1784
Pennsylvania Historical and Museum Commission records state that Franklin County was created on September 9, 1784 from part of Cumberland County and named for Benjamin Franklin. Chambersburg grew from a settlement associated with Benjamin Chambers and remains the county seat.
PHMC notes that Chambersburg was laid out in 1764 and incorporated as a borough in 1803. Franklin County developed with a strong agricultural base, and the long, relatively low Cumberland Valley provided favorable ground for farms, towns, railroads, and later major highways.
The county also played a notable role during the Civil War. PHMC records that Confederate forces captured Chambersburg twice and burned the town during the second occupation in July 1864. The modern road map does not show those events, but the open valley corridor between Maryland and central Pennsylvania helps explain the area’s strategic location.
Mercersburg and Cove Gap show how routes cross the western mountain front
Mercersburg lies close to the western ridges and is reached by PA 75 and PA 416. Farther west, Cove Gap cuts through the high terrain near the county boundary. On the elevation map, the gap stands out as a lower passage through a mountain belt that otherwise forms a major barrier.
Pennsylvania DCNR’s Buchanan’s Birthplace State Park is located in Cove Gap west of Mercersburg. The 18.5-acre park marks the birthplace of James Buchanan, who was born there in 1791 before his family later moved to Mercersburg.
DCNR’s history of the site explains that the surrounding mountains made westward travel difficult, while the gap provided a practical route through part of the ridge system. That historical role becomes easier to understand when the park location is compared with the county’s elevation map.
Fayetteville and Caledonia mark the climb into South Mountain
East of Chambersburg, U.S. 30 passes through Fayetteville and begins climbing toward South Mountain. The general map shows the highway continuing directly across the county, but the elevation map reveals the sharp change from broad valley lowland to higher ridge terrain.
Pennsylvania DCNR describes Caledonia State Park as a 1,125-acre park in Franklin and Adams counties along U.S. 30 between Chambersburg and Gettysburg. The park sits within South Mountain, which DCNR identifies as the northern end of the Blue Ridge Mountains.
The Fayetteville and Mont Alto side therefore has a stronger mountain influence than central Chambersburg. Streams descend westward from the highlands, and roads use lower grades and gaps through the ridges. This gives eastern Franklin County a very different terrain character from the open valley around I-81.
Greencastle and Waynesboro divide the southern county into two distinct corridors
Greencastle lies close to I-81 and forms part of the main north-south valley route from Chambersburg toward Maryland. State Line appears immediately to the south, while Conococheague Creek and Greencastle Reservoir provide local water references.
Waynesboro is farther east and more closely tied to the South Mountain foothills. PA 16 crosses the area, with PA 316, PA 997, and PA 64 connecting surrounding communities. Antietam Creek is one of the main local drainage features, and higher terrain rises quickly to the east and northeast.
Although both communities are in southern Franklin County, they make sense in different geographic frameworks. Greencastle is best understood through I-81 and the Cumberland Valley, while Waynesboro is easier to place using PA 16, Antietam Creek, and the nearby mountain front.
Use the map that matches the question
The general reference map is the quickest choice for roads and communities. It places Chambersburg, Shippensburg, Greencastle, Waynesboro, Mercersburg, Mont Alto, I-81, U.S. 30, U.S. 11, PA 16, PA 75, and PA 233 in one view. The ranked community map is cleaner when the goal is simply to compare the larger settlements.
The terrain-and-water map is more useful for Conococheague Creek, Back Creek, Antietam Creek, Letterkenny Reservoir, Greencastle Reservoir, and the smaller mountain tributaries. The elevation map removes many labels and makes the broad Cumberland Valley and the two high mountain margins 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 show how settlements fit within the valley drainage.
Frequently Asked Questions
What is the best place to start when locating areas in Franklin County?
Chambersburg is the easiest central reference because I-81 and U.S. 30 pass nearby. From there, Shippensburg is to the northeast, Greencastle is south, Waynesboro is southeast, and Mercersburg is west near the mountain front.
Why is central Franklin County lower than the eastern and western edges?
Most of the central county occupies the broad Cumberland Valley. Tuscarora Mountain rises along the western side, while South Mountain forms the high eastern margin, so the elevation map shows a wide green lowland between two much higher ridge systems.
Are the population values printed on the ranked map current official estimates?
Not necessarily. Values such as Chambersburg 22,319 and Waynesboro 11,047 are the ranking figures printed on the supplied map. Readers who need the newest official population numbers should consult current U.S. Census Bureau releases.
Map File Information
The download ZIP contains four A3 high-resolution JPG files: the Franklin County general reference map, ranked community map, terrain-and-water map, and elevation map. The 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
- Pennsylvania Historical and Museum Commission – Franklin County: county formation, Chambersburg history, and regional background.
- Franklin County Government: official county government and current administrative information.
- Pennsylvania DCNR – Buchanan’s Birthplace State Park: Cove Gap, Mercersburg-area history, and western mountain setting.
- Pennsylvania DCNR – Caledonia State Park: U.S. 30, South Mountain, and eastern Franklin County terrain.
- U.S. Census Bureau TIGER/Line Shapefiles: county boundaries and transportation geography.
- 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.
