Oniontown is represented in Griller Stadium by the Oniontown Crushers baseball team and the Oniontown Ringers hockey team. Oniontown also has a local football team, the Oniontown Bulbdogs, as well as a minor league baseball team that Pinch Hitwell once played for. Both the Bulbdogs and the minor league baseball team play in the Oniontown Sourdome.
Oniontown also hosts Sprocketworld, an underground steampunk convention held annually.
The History of Oniontown
In its early settlement days, Oniontown was known as Fort Briny, because of its location on Briny Bay. The harbor town's population comprised of a wide range of people from many different ports. Despite their differences, they all loved eating onions with every meal. Unfortunately onions wouldn't grow in the town's salty dirt, so they had to have them shipped in from other locations. The town's streets would be filled with Onion Johnnies and Jennies selling their freshest onions.
However, on the eve of the town's inaugural onion festival, a cargo ship carrying an enormous amount of onions sunk in the harbor, filing Briny Bay with tens of thousands of onions. The town was filled with the pungent smell of mushy onions for the rest of the year. Sailors began referring to Fort Briny as Oniontown. They would make jokes like "A sailor needeth only one's nose to find the dreary docks of Oniontown".
As the city grew, the nickname stuck, and it became officially known as Oniontown. The Oniontowners embraced their rather embarrassing history, and built the huge statue of Onion Jenny to represent the town's onion sellers of the past. Now, Onion Jenny smugly greets all incoming sailors with pride and a string of giant onions. 
- Allium Arrangements, a flower shop.
- Baiter Fish Market
- Big Onion Souvenirs
- Glitz Hotel
- Oniontown Sourdome, a sports stadium that hosts both the Oniontown Bulbdogs and the town's minor league baseball team.
- Papa's Scooperia, Papa Louie's fourteenth restaurant.
- Scallion Street Station, a train station.
- Briny Bay, a bay located off the coast of Oniontown.
- Briny Gate Bridge, a bridge that holds the parade in Papa's Scooperia/HD/To Go!.
- Oniontown High School, a high school that Allan attended after moving to Oniontown from Tastyville.
- Oniontown Middle School, a middle school that Sarge Fan attended.
- Sarge Fan's house
- If you look closely at the railway, you can see a number 14. This is most likely because Papa's Scooperia is the 14th game in the "Gameria" series.
- If you look closely, you can see Tony's son and daughters' name in graffiti, namely:
- Oniontown takes influence from the real-life city of New York and has many references to it as well. They are mostly based in Manhattan and Brooklyn.
- Oniontown's statue (Onion Jenny) is an obvious reference to the Statue of Liberty.
- The Glitz Hotel is a reference to one of Manhattan's tall and luxurious hotels, as well as smaller hotels and motels (in Brooklyn), and also The Ritz Hotel brand in general.
- The Briny Gate Bridge is a reference to the Brooklyn Bridge.
- While Carlo Romano/Koilee/Custom Worker shops at one of the stores in Oniontown, he/she wears a T-shirt saying "I Like Oniontown" which is a reference to "I Love New York".
- There is a system of running railroads which cover all of Oniontown: a reference to New York's 24 hours railroad system.
- Carlo Romano/Koilee/Custom Worker has trouble finding a vacancy in Oniontown, which is a satirical reference to New York's low vacancy rate.