Astoria is a town in Deuel County, South Dakota, United States. The population was 139 at the 2010 census.
Astoria was platted in 1900. The town was named after Astoria, Oregon. A post office has been in operation at Astoria since 1900.
Astoria is located at 44°33′28″N 96°32′47″W (44.557702, -96.546326).
According to the United States Census Bureau, the town has a total area of 0.16 square miles (0.41 km2), all land.
Astoria has been assigned the ZIP code 57213, and the FIPS place code 02580.
As of the census of 2010, there were 139 people, 61 households, and 32 families residing in the town. The population density was 868.8 inhabitants per square mile (335.4/km2). There were 74 housing units at an average density of 462.5 per square mile (178.6/km2). The racial makeup of the town was 100.0% White.
There were 61 households, of which 27.9% had children under the age of 18 living with them, 45.9% were married couples living together, 1.6% had a female householder with no husband present, 4.9% had a male householder with no wife present, and 47.5% were non-families.