Oakdale is a borough in Allegheny County, Pennsylvania, United States. The population was 1,459 at the 2010 census. Its zip code is 15071. Oakdale is affectionately known as "America's Home Town". It is home to the Oakdale Inn, Sil's Market, The ROCK, and San Diego Padres pitcher Scott Patterson. According to the United States Census Bureau, the borough has a total area of 0.5 square miles (1.3 km2), all of it land.