Blair County lies in central Pennsylvania where Altoona and Hollidaysburg occupy a broad central valley bordered by long Appalachian ridges. Tyrone sits farther north in the Little Juniata River corridor, while Roaring Spring and Martinsburg occupy a separate southern valley. This page compares roads, major communities, waterways, reservoirs, and elevation, and the four original A3 high-resolution JPG map files can be downloaded from the file section below.
The county is long from north to south and its terrain follows the same general direction. Lower valleys provide room for communities and transportation, while higher ridges rise sharply on the western side and repeat through the eastern half. Clearfield and Centre counties lie along the northern side, Huntingdon County is east, Bedford County is south, and Cambria County borders the west, placing Blair County where Allegheny Mountain terrain meets a series of ridge-and-valley corridors.
Table of Contents
Altoona and Hollidaysburg anchor the county’s main road corridor
Altoona is the easiest place to find on the general reference map. Hollidaysburg lies immediately to the south, and the U.S. 220 and I-99 corridor links the two before continuing north toward Bellwood and Tyrone. PA 764 also follows the central valley north of Altoona, while PA 36 leaves the urban area toward Roaring Spring and the southern part of the county.
The terrain limits east-west travel more than the map shape alone might suggest. High ground rises quickly west of Altoona toward Cambria County, while several narrow ridges separate the central valley from Williamsburg and the Huntingdon County side. Roads therefore use lower gaps and valleys rather than crossing every ridge directly. The route from Hollidaysburg toward Williamsburg is a good example, bending through lower terrain before reaching the Frankstown Branch valley.
The southern county has a more open road pattern. Roaring Spring and Martinsburg sit in a wider agricultural valley where PA 36, PA 866, PA 867, and local roads connect smaller communities. Near the southwestern edge, PA 164 approaches rougher terrain toward the Bedford and Cambria county sides. These differences make road distance and straight-line distance noticeably different in several parts of Blair County.
Altoona dominates the population ranking while other boroughs occupy separate valleys
The ranked community map highlights Altoona, Hollidaysburg, Tyrone, Roaring Spring, Martinsburg, and Bellwood. The values printed in the map index are Altoona 43,196, Hollidaysburg 5,558, Tyrone 5,377, Roaring Spring 2,335, Martinsburg 1,741, and Bellwood 1,691. Those figures explain the ranking used in the supplied graphic; readers needing the latest official population estimate should check current Census Bureau releases.
Altoona and Hollidaysburg form the closest pair among the six locations, with the two built-up areas occupying the same broad central valley. Bellwood lies north of Altoona in a narrower corridor, and Tyrone is farther north where the Little Juniata River passes through a mountain gap. Roaring Spring and Martinsburg are separated from the Altoona cluster by terrain and sit together in the wider southern valley.
This distribution shows why Blair County does not have one continuous urban strip from end to end. The largest city occupies the central valley, northern boroughs follow a river corridor between ridges, and the southern communities sit on a different lowland. Comparing the ranked map with the elevation map makes the influence of the surrounding mountains particularly clear.
Little Juniata River and the Frankstown and Beaverdam branches follow different valleys
The terrain-and-water map shows how closely drainage follows the mountain structure. In the north, the Little Juniata River passes through the Tyrone area and occupies a narrow valley before leaving the county toward the east. Farther south and east, the Frankstown Branch Juniata River follows the Williamsburg side of the county. The Beaverdam Branch Juniata River drains lower ground through the central and southern interior, giving Blair County several distinct river corridors rather than one single trunk valley.
A cluster of small reservoirs appears in the high ground west and northwest of Altoona. Lake Altoona, Kittanning Reservoir, and Mill Run Reservoir sit close to the city’s western side, while Plain Nine Reservoir lies farther south. Bellwood Reservoir provides another landmark north of Altoona, and the Tyrone area includes Tipton Reservoir and Tyrone Reservoir Number Two.
On the eastern side, Piney Creek and Clover Creek occupy long valleys between parallel ridges. Mill Run and many smaller tributaries descend toward the larger Juniata branches. The pattern is different from a county dominated by one large lake: Blair County’s water geography is a network of rivers, creeks, and relatively small reservoirs set among steep ridges.
The water map is a regional reference and should not be used to determine flood-zone status, reservoir operations, water depth, or water quality. Current conditions and regulatory decisions require information from FEMA, USGS, Pennsylvania agencies, or the organization responsible for a specific reservoir.
Elevation rises from about 217 to 899 meters across the county
The elevation map displays an actual range of roughly 217 to 899 meters and a mean near 460 meters. The Altoona–Hollidaysburg valley appears in lower green tones, while the western boundary is lined with much higher brown terrain. That high western belt becomes especially prominent toward the north, where narrow lowlands around Tyrone and Bellwood are enclosed by steep slopes.
The eastern half contains another set of elongated ridges. A prominent central ridge extends for much of the county and bends through the middle, while another narrow upland follows the eastern side near the Williamsburg and Huntingdon County corridor. These repeated ridges divide the county into several parallel valleys rather than one broad basin.
The southern valley around Roaring Spring and Martinsburg is wider than the Tyrone corridor, but it is still bounded by substantial uplands. Elevation rises quickly toward the southwestern edge and along eastern ridges, so roads often remain in low ground for long distances before finding a practical crossing. This helps explain the strongly north-south orientation of many transportation routes.
The colored elevation surface is intended for county-wide comparison, not property-level measurement. It can show where the main valleys and mountain belts lie, but a building, parcel, bridge, or engineering project requires authoritative source elevation data or professional surveying.
The Tyrone–Bellwood corridor narrows before opening into Altoona
The route from Tyrone through Bellwood to Altoona is one of the clearest north-south corridors in Blair County. Near Tyrone, the Little Juniata River, railroad lines, and highways occupy a narrow passage with mountains close on both sides. Bellwood continues in the same general valley, but the landscape begins to open as the route approaches Altoona.
Altoona itself occupies a much broader piece of low ground, which helps explain its larger urban footprint and denser road network. Hollidaysburg continues the developed corridor immediately to the south. Blair County government offices are centered in Hollidaysburg, even though Altoona is by far the larger city, so the two places serve different regional roles.
The high ground west of Altoona also connects the modern map with local transportation history. Blair County materials and local historical sources emphasize the Pennsylvania Railroad and Horseshoe Curve as major parts of the county’s heritage. The sharp rise in elevation west of Altoona makes the engineering challenge of crossing the Allegheny Mountains easy to understand even from a modern terrain map.
Roaring Spring and Martinsburg share a broader southern valley
South of Hollidaysburg, the urban density drops quickly and the landscape opens into a more rural valley around Roaring Spring and Martinsburg. PA 36 and other local routes follow this lower ground, while small streams cross farmland and feed the Beaverdam Branch Juniata River system. Compared with central Altoona, development is more dispersed and the surrounding mountains remain more visually dominant.
Roaring Spring occupies an important local road junction, while Martinsburg lies to the east on relatively open terrain within the same broader lowland. The connection between them is more direct than many east-west trips elsewhere in the county because no major ridge separates the two towns. Travel beyond the valley, however, quickly encounters steeper terrain toward Bedford or Cambria counties.
The water and elevation maps also show that this southern area is not a flat plain. Numerous small streams divide the valley floor, and higher ground closes in toward the county edges. Using Roaring Spring and Martinsburg as reference points makes the southern portion of Blair County much easier to understand.
Williamsburg follows the Frankstown Branch on the eastern side
A long ridge separates the Altoona–Hollidaysburg area from Williamsburg, so the eastern community does not feel like an immediate extension of the central urban corridor. Roads from Hollidaysburg use lower passages through the mountains before reaching the Frankstown Branch Juniata River valley. From Williamsburg, that valley continues naturally toward Huntingdon County.
Piney Creek and Clover Creek occupy nearby north-south valleys, and the surrounding ridges leave relatively few direct cross-mountain routes. The combination of streams and uplands explains why the eastern county contains elongated travel corridors rather than a grid of straight roads.
The general reference map shows fewer place names in this part of Blair County, but the water and elevation maps reveal strong geographic detail. Following the low bands between the ridges makes it easier to see how Williamsburg and the surrounding rural areas connect with both the central county and the Huntingdon side.
Choose the map according to the information you need
For roads and place names, the general reference map is the best starting point. Altoona provides the central anchor, and the positions of Hollidaysburg, Tyrone, Bellwood, Williamsburg, Roaring Spring, and Martinsburg can be compared with the major routes in one view. The ranked community map is cleaner when the goal is simply to compare larger settlements and see how strongly Altoona dominates the county’s population pattern.
For rivers and reservoirs, the terrain-and-water map provides the most useful detail. It identifies the Little Juniata River, Frankstown Branch Juniata River, Beaverdam Branch Juniata River, and numerous reservoirs while retaining shaded relief. The elevation map removes most labels and emphasizes height, making the central valleys and parallel mountain ridges easier to compare.
For classroom handouts, printed reference material, or presentation slides, use the original A3 JPG files in the download archive rather than enlarging the web previews. Pairing the general map with the elevation map works well for explaining roads and terrain, while the community and water maps are useful for showing how settlements relate to major valleys.
Hollidaysburg and Altoona reflect two different parts of Blair County history
The Blair County Historical Society explains that Blair County was created in 1846, named for John Blair, and established Hollidaysburg as the county seat. Hollidaysburg had already grown as an important transportation center connected with the Pennsylvania Canal and the Allegheny Portage Railroad. The county courthouse remains in Hollidaysburg today, preserving that administrative role beside the much larger Altoona urban area.
Altoona developed in a different way. Local historical material describes its growth as closely tied to the Pennsylvania Railroad, which established a major presence there in the nineteenth century. Blair County’s own materials also highlight Horseshoe Curve and railroad heritage among the region’s notable historical features.
Modern Blair County therefore combines several distinct settings: an urban center at Altoona, an administrative center at Hollidaysburg, a northern river corridor around Tyrone, and a broad rural valley around Roaring Spring and Martinsburg. Looking at roads, communities, waterways, and elevation together provides a more complete picture than any single map can provide alone.
Frequently Asked Questions
What is the easiest reference point for locating places in Blair County?
Start with Altoona. Hollidaysburg is immediately south, Bellwood and Tyrone follow the northern valley, and Roaring Spring and Martinsburg occupy the separate southern valley. Using Altoona together with the U.S. 220 and I-99 corridor makes the main communities much easier to place.
Why do many Blair County roads and towns form long north-south corridors?
Long Appalachian ridges and low valleys run in nearly parallel bands across the county. Roads, streams, rail lines, and settlements generally use the lower terrain instead of repeatedly crossing high ridges. The Tyrone–Bellwood–Altoona corridor and the southern Roaring Spring valley are clear examples.
Can the 217–899 meter elevation range be used for an exact property elevation?
No. The range summarizes county-wide terrain and is useful for comparing low valleys with high mountain belts. It does not provide a survey-grade elevation for an individual parcel or structure, so property-specific work should rely on authoritative elevation data or professional surveying.
Map File Information
The download ZIP contains four A3 high-resolution JPG files: the Blair 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 notes, 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
- Blair County official website: county government and local information.
- Blair County Historical Society – Hollidaysburg: county formation, county-seat history, and early transportation.
- Blair County Historical Society – Altoona: Altoona and Pennsylvania Railroad history.
- U.S. Census Bureau TIGER/Line Shapefiles: county boundary and transportation geography.
- USGS National Hydrography: rivers, streams, reservoirs, and hydrographic 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.
