Petrolia is a borough in Butler County, Pennsylvania, home to about 186 people across 0.4 square miles. It has no ZIP code of its own: it’s part of 16050.
Homes sold for a median of $123 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Washington Township (Butler County); part is in Petrolia
Each card is that ZIP code’s whole market, including any part outside Petrolia. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Petrolia’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)45 miles away |
|---|---|
| Nearest city of 250,000+ | Pittsburgh, PA43 miles away |
| Nearest city of 1 million+ | Philadelphia, PA254 miles away |
Straight-line distances from the center of Petrolia; 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.
Petrolia had 179 residents in the 2020 census, down 18% since 2000.
It’s the 2453rd largest of 2,568 towns in Pennsylvania by population.
Butler County grew from 56,962 residents in 1900 to 193,763 in 2020.
Butler County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 81°F in summer, and winter lows average 17°F. About 45.3 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Slippery Rock 1 Ssw, PA weather station (15 miles away).
86,610 jobs at 5,083 businesses in Butler County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
3 doctors and other health care providers list an office in Petrolia.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Nurse practitioners and physician assistants | 1 |
| Mental health providers | 1 |
| Pharmacies | 1 |
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.
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Shares ZIP codes with Washington Township (Butler County), Fairview Township (Butler County), Fairview Borough, Parker Township and Bruin.
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.