Irish names (O'Fallon, Ill.) and French ones (Coeur d'Alene, Idaho) aren't possessives and get by.

WSJ: In U.S., Apostrophes in Place Names Are Practically Against the Law

"I like being here, " said Wilkerson, who came from Coeur d'Alene, Idaho.

NPR: Smaller Crowd, But Still Excitement This Time