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| City | Addison |
| State | Pennsylvania (PA) |
| County | Somerset |
| Country | United States of America |
| Timezone | Eastern Time (America/New_York) |
| Latitude | 39.7473 |
| Longitude | -79.339201 |
| Population | 680 |
| Density | 18.0 /km² |
| Incorporated | N/A |
| ZIP Code(s) | 15411 |
| Area Code | 215, 223, 267, 272, 412, 445, 484, 570, 582, 610, 717, 724, 814, 835, 878 |
| County Seat | Somerset |
| School District | Turkeyfoot Valley Area School District |
Addison is a locality in Somerset County, Pennsylvania, United States. It is a small community with a population of 680. The population density is 18.0 people per km². Addison is located at 39.7473°N, 79.3392°W. It observes the Eastern Time (America/New_York) timezone. ZIP code: 15411.
Addison sits at the confluence of rolling hills and broad, fertile valleys, a place where the land itself seems to breathe with a quiet, steady presence. It lies 12.7 miles north-north-west of Garrett, MD (from Garrett, MD: bearing 348°T), and is situated 4.6 miles south-south-east of Confluence. The terrain here is a study in patient erosion, where the streams that feed the Casselman River have sculpted the soft shale and sandstone into gentle slopes and broad bottoms, cloaked in a dense, mixed deciduous forest that turns a riot of ochre and crimson in the autumn light. The air, especially after a rain, carries the damp, earthy scent of fallen leaves and the subtle sweetness of pine, a constant reminder of the wildness that presses in from the surrounding ridges. The sky overhead is often a vast expanse of shifting grays and blues, punctuated by the stoic flight of hawks circling on unseen currents, their shadows briefly darkening the patchwork fields of corn and hay that break the monotony of the trees. The history of Addison is tied to the very pathways carved by water and early settlers seeking passage and opportunity. This was a waypoint, a place where travellers paused, and the modest homes and weathered barns speak of lives lived in close proximity to the land and its demands. The local economy, once fueled by the timber that carpeted the hills and the iron ore that lay beneath, now largely rests on agriculture and the quiet industry of those who find solace and a living in this corner of Somerset County. The Casselman River, though not a grand artery, still whispers tales of its past importance, its waters reflecting the slow passage of days and the enduring spirit of the communities that have long called Addison home.
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This page provides an embedded street and satellite map of Addison, Pennsylvania — switch between views using the small square in the bottom left-hand corner of the map. Coordinates: 39.7473, -79.339201. Live weather conditions are sourced directly from the National Weather Service, with current observations and a 7-day forecast also powered by Open-Meteo. Real-time local news and world news feeds keep the page current, while a Wikipedia summary or an editorially written description provides background on Addison and Somerset County.
Detailed location data for Addison includes the ZIP code (15411), telephone area code (215, 223, 267, 272, 412, 445, 484, 570, 582, 610, 717, 724, 814, 835, 878), county seat of Somerset County (Somerset), and school district assignment (Turkeyfoot Valley Area School District). These are among the most commonly searched location details for any US city or town.
Location data is drawn from the USGS Geographic Names Information System (GNIS) and cross-verified against 2020 US Census records by coordinate proximity — ensuring the correct Addison is identified even where the name is shared across multiple counties or states. Population figures are sourced from the 2020 US Census.
| Page generated | July 2026 |
| Location data | SimpleMaps US Cities Database; coordinates matched to USGS GNIS definitive data |
| Wikipedia validation | Article content matched to USGS GNIS coordinates via Wikipedia geosearch API. Location verified by proximity — not name matching alone. |