Delmar[a] is a city in Clinton County, Iowa, United States.

[4] The name Delmar is said to be a combination of the initials of the six ladies on the first train to arrive into the station: Della, Emma, Laura, Marie, Anna, and Rose.

[9] According to the United States Census Bureau, the city has a total area of 0.76 square miles (1.97 km2), all land.

There were 213 housing units at an average density of 278.8 per square mile (107.6/km2).

28.6% of all households were made up of individuals, and 12.6% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 99.42% White, 0.19% Native American, 0.19% Asian, and 0.19% from two or more races.

25.6% of all households were made up of individuals, and 15.4% had someone living alone who was 65 years of age or older.

Delwood began whole-grade sharing with nearby Maquoketa in the 1980s, Students in grades 7-12 attend Maquoketa, while grades Pre-K through 6 remain at the Delwood School in Delmar.

The following buildings in Delmar are listed on the National Register of Historic Places:[15]