Many municipalities in Illinois have partisan city and town elections, but the parties are local parties that exist only in that municipality. In North Riverside Village, the two parties are the Voters Improvement Party (which is an old party that has held power for decades) and a new party, the Transparency & Accountability in Politics Party.
The new party only appeared on the April 9 ballot because it won a lawsuit. It had been removed from the ballot on the grounds that Illinois state law says parties can have no more than five words in their name. But the State Appeals Court put the party back on, ruling that an ampersand is not a word. See this story.