Avalon is a borough in Allegheny County, Pennsylvania, United States, along the Ohio River 6 miles (10 km) downstream from Pittsburgh. The population was 4,762 at the 2020 census. It is a residential suburb of the Pittsburgh metropolitan area.

On December 9, 1874, a group of 29 property owners met and decided they wanted to separate from Kilbuck Township, which itself split from Pine Township in 1869. They petitioned the Court of Quarter Sessions of Pennsylvania for incorporation papers. The petition was drawn up by Noah Shafer, who eventually became West Bellevue's first solicitor. The group was notified that it first had to hold an election so officials of the petitioning body could make the request for incorporation. The first election was held December 26, 1874. James Semple was elected the first burgess, a position he held three different times. When the petition was submitted the second time, the court was in recess. The court met again in April, and on April 7, 1875, approved the petition and West Bellevue's right to incorporation. It was named after the legendary island of Avalon ("land of apples") on account of there being several orchards in the area. The streetcar reached Avalon around 1900, and in later years the borough was served by Pittsburgh Railways route 14 Avalon and then route 6/14 Brighton Avalon. The service ended on April 30, 1966, when many of the West End lines were abandoned by the Port Authority of Allegheny County, in preparation for bridge replacements over the Allegheny River.

Avalon is located at 40°30′4″N 80°4′7″W / 40.50111°N 80.06861°W / 40.50111; -80.06861.

According to the United States Census Bureau, the borough has a total area of 0.7 square miles (1.8 km), of which 0.6 square miles (1.6 km) is land and 0.1 square miles (0.26 km) is water. Its average elevation is 932 feet (284 m) above sea level.

Avalon has four land borders, including Ben Avon Heights to the north, Kilbuck Township to the north, northeast and northwestern corner, Bellevue to the east, and Ben Avon to the west. Across the Ohio River to the south, Avalon runs adjacent with the eastern end of Neville Island (Neville Township) as well as the Davis Island Lock and Dam Site in which its location is designated as in Avalon.

Historical population

Census	Pop.	Note	%±
1880	326		—
1890	804		146.6%
1900	2,130		164.9%
1910	4,317		102.7%
1920	5,277		22.2%
1930	5,940		12.6%
1940	6,155		3.6%
1950	6,463		5.0%
1960	6,859		6.1%
1970	7,010		2.2%
1980	6,240		−11.0%
1990	5,784		−7.3%
2000	5,294		−8.5%
2010	4,705		−11.1%
2020	4,762		1.2%
Sources:

As of the census of 2000, there were 5,294 people, 2,629 households, and 1,282 families residing in the borough. The population density was 8,409.1 inhabitants per square mile (3,246.8/km). There were 2,845 housing units at an average density of 4,519.1 per square mile (1,744.8/km). The racial makeup of the borough was 83% White, 5% African American, 0.09% Native American, 0.45% Asian, 0.02% Pacific Islander, 0.15% from other races, and 1.40% from two or more races. Hispanic or Latino of any race were 0.59% of the population.

There were 2,629 households, out of which 19.7% had children under the age of 18 living with them, 34.6% were married couples living together, 11.6% had a female householder with no husband present, and 51.2% were non-families. 45.4% of all households were made up of individuals, and 21.3% had someone living alone who was 65 years of age or older. The average household size was 1.99 and the average family size was 2.83.

In the borough the population was spread out, with 18.2% under the age of 18, 8.6% from 18 to 24, 29.6% from 25 to 44, 20.2% from 45 to 64, and 23.5% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 84.6 males. For every 100 females age 18 and over, there were 80.4 males.

The median income for a household in the borough was $29,236, and the median income for a family was $41,327. Males had a median income of $31,568 versus $24,149 for females. The per capita income for the borough was $18,594. About 8.4% of families and 11.3% of the population were below the poverty line, including 18.6% of those under age 18 and 10.3% of those age 65 or over.

804 people lived in Avalon in 1890, 2,130 people lived in Avalon in 1900; 4,317 people lived in Avalon in 1910, and 6,155 people lived in Avalon in 1940.

Presidential Elections Results

Year	Republican	Democratic	Third Parties
2020	34% 945	64% 1,761	1% 38
2016	36% 868	59% 1,425	5% 133
2012	40% 911	59% 1,352	1% 33

The borough is located in the Northgate School District.

• Robert J. Corbett, U.S. Representative from Pennsylvania
• Jim Haslett, NFL Football Player and Coach
• Mercury Morris, Super Bowl winning running back and kick returner.

• List of cities and towns along the Ohio River

• Borough of Avalon official site
• Historic Pittsburgh Map Collections: 1906 – Northern Vicinity of Pittsburgh: Plate 3