The population of the Westridge area on the 1928 electoral roll numbered over 130. At the , Yarralumla had a population of 2,890 people. Of these 46.9% were male. The suburb had only 1.0% indigenous Australians, below the national average of 2.8%. The percentage of married people in the suburb was nine points higher than the national average, and the proportion of residents who had never married was 9 points lower. The higher level of marriage did not translate into a higher level of children; 49.6% of families consisted of a couple without children in the household, compared to the national average of 37.8%. Yarralumla residents had a median age of 49, compared to a Canberra average of 35. The suburb had an older population for a city of young people; the median national age is 38 and 41.7% of Yarralumla residents were 55 or over, compared to the national figure of 27.6%.