|• Type||Borough Council|
|• Total||0.8 sq mi (2.1 km2)|
|• Land||0.8 sq mi (2.1 km2)|
|• Water||0.0 sq mi (0.0 km2)|
|• Density||296/sq mi (114.1/km2)|
|Time zone||Eastern (EST) (UTC-5)|
|• Summer (DST)||EDT (UTC-4)|
Portersville is located near the western border of Butler County at  It is surrounded by Muddy Creek Township, though the borough's western border comes within 660 feet (200 m) of the Lawrence County line.(40.925285, -80.144229).
U.S. Route 19, Perry Highway, passes through the center of the borough, leading north 22 miles (35 km) to Mercer and south 9.5 miles (15.3 km) to Zelienople. Interstate 79 passes just east of the borough, with access from Exit 96 (PA 488). I-79 leads south 38 miles (61 km) to Pittsburgh and north 90 miles (140 km) to Erie. Moraine State Park, situated around Lake Arthur, is a short distance east of I-79. Portersville lies between the cities of Butler 15 miles (24 km) east and New Castle 14 miles (23 km) to the west.
Portersville has a small police force, an ambulance service, and a volunteer fire department. The Ambulance Service, Portersville EMS, and the Volunteer Fire Department, Portersville/Muddy Creek Township Volunteer Fire Department cover the Portersville area to include Muddy Creek Township, parts of Perry Township in Lawrence County, parts of Slippery Rock Township in Lawrence County, as well as Parts of Franklin Township in Butler County.
Portersville has several events each year in the immediate and surrounding areas. The Portersville Steam Show occurs three times a year (May, August, and October). This event displays older steam engines and farm machinery to the public. The Moraine/Lake Arthur Regatta (in August each year) has water related activities for the entire family. The Pennsic War occurs each summer north of Portersville. McConnells Mill State Park, west of Portersville, holds its Heritage Days in September.
As of the census of 2000, there were 268 people, 103 households, and 79 families residing in the borough. The population density was 328.4 people per square mile (126.2/km²). There were 109 housing units at an average density of 133.6 per square mile (51.3/km²). The racial makeup of the borough was 99.63% White, and 0.37% from two or more races.
There were 103 households, out of which 36.9% had children under the age of 18 living with them, 64.1% were married couples living together, 8.7% had a female householder with no husband present, and 23.3% were non-families. 20.4% of all households were made up of individuals, and 6.8% had someone living alone who was 65 years of age or older. The average household size was 2.60 and the average family size was 3.03.
In the borough the population was spread out, with 26.5% under the age of 18, 6.0% from 18 to 24, 34.3% from 25 to 44, 25.0% from 45 to 64, and 8.2% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 98.5 males. For every 100 females age 18 and over, there were 93.1 males.
The median income for a household in the borough was $37,750, and the median income for a family was $40,536. Males had a median income of $35,625 versus $17,500 for females. The per capita income for the borough was $17,356. About 7.8% of families and 6.4% of the population were below the poverty line, including 9.7% of those under the age of eighteen and none of those sixty five or over.
- "Geographic Identifiers: 2010 Demographic Profile Data (G001): Portersville borough, Pennsylvania". U.S. Census Bureau, American Factfinder. Retrieved March 25, 2014.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2015". Retrieved July 2, 2016.
- "Census of Population and Housing". U.S. Census Bureau. Retrieved 11 December 2013.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "Incorporated Places and Minor Civil Divisions Datasets: Subcounty Resident Population Estimates: April 1, 2010 to July 1, 2012". Population Estimates. U.S. Census Bureau. Retrieved 11 December 2013.