Udell is a city in Appanoose County, Iowa, United States.

[5] According to the United States Census Bureau, the city has a total area of 0.32 square miles (0.83 km2), all land.

There were 19 housing units at an average density of 68.9 per square mile (26.6/km2).

There were 26 housing units at an average density of 81.3 per square mile (31.4/km2).

28.6% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older.

There were 24 housing units at an average density of 75.7 per square mile (29.2/km2).

19.0% of all households were made up of individuals, and 4.8% had someone living alone who was 65 years of age or older.

There were 16.7% of families and 15.3% of the population living below the poverty line, including 16.7% of under eighteens and none of those over 64.