Lake Angelus recorded a higher population of 287 at the 2020 census, making Omer again the state's least-populated city.

However, he found a post office in another town called Homer, Michigan and simply dropped the leading H, producing the final name.

The community received a station on the Detroit and Mackinaw Railroad, while in 1872 the area was platted.

[5] A fire in 1914 almost eliminated the city, destroying 40 buildings and ending the early thrive that Omer had.

Two years later, a flood curtailed rebuilding efforts by washing out the local dam.

Omer is the location of the story of the "cussing canoeist", the man who received a ticket under a century-old law for shouting a long stream of expletives in the presence of a woman and her two young children after he fell out of a canoe on the Rifle River.

The American Civil Liberties Union intervened on the canoeist's behalf and got the law struck down in court.

[5] A second news story of note concerned the successful secession of two households from the city because the City of Omer was charging them a water tax while refusing to deliver water service to their property.