Castle Shannon is a borough in Allegheny County, Pennsylvania, home to about 8,209 people across 1.6 square miles. Its ZIP code is 15234.
Homes sold for a median of $206 per square foot in the three months ending August 2026, a seller’s market.
Mostly Castle Shannon; also Pittsburgh and Mount Lebanon
Each card is that ZIP code’s whole market, including any part outside Castle Shannon. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Castle Shannon’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Pittsburgh International Airport (PIT)14 miles away |
|---|---|
| Nearest city of 250,000+ | Pittsburgh, PA5 miles away |
| Nearest city of 1 million+ | Philadelphia, PA259 miles away |
Straight-line distances from the center of Castle Shannon; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Castle Shannon had 8,249 residents in the 2020 census, down 4% since 2000.
It’s the 348th largest of 2,568 towns in Pennsylvania by population.
Allegheny County grew from 775,058 residents in 1900 to 1,250,578 in 2020.
Allegheny County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 83°F in summer, and winter lows average 22°F. About 41.3 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Pittsburgh Allegheny Co Ap, PA weather station (5 miles away).
709,774 jobs at 33,812 businesses in Allegheny County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
137 doctors and other health care providers list an office in Castle Shannon.
Nearest hospitals
Providers with an office here
| Primary care doctors | 14 |
|---|---|
| Specialist doctors | 6 |
| Dentists | 12 |
| Nurse practitioners and physician assistants | 9 |
| Mental health providers | 31 |
| Physical and occupational therapists | 53 |
| Chiropractors | 12 |
| Pharmacies | 7 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (10 nearby)
Grocery stores (1 nearby)
Pharmacies (4 nearby)
Libraries (3 nearby)
Museums
Theaters and performance venues
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1786.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Bethel Park SD, Mt Lebanon SD, Keystone Oaks SD and others. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Abraham Lincoln El SchPittsburgh | K–4 | 348 | Public | 1.0 mi |
| Foster El SchPittsburgh | K–5 | 304 | Public | 0.9 mi |
| Myrtle Ave SchPittsburgh | K–5 | 312 | Public | 0.1 mi |
| Young Scholars of Western Pennsylvania CSPittsburgh | K–8 | 297 | Charter | 0.6 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Pittsburgh, Mount Lebanon, Baldwin Township, Bethel Park and Whitehall Borough.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.