18501
The Association of the Oldest Inhabitants of the District of Columbia ( AOI ) is the oldest civic organization in Washington , D.C. , representing long-term citizens of the city .
 Oldest Inhabitants, Columbia, Washington , D.C.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Oldest Inhabitants, Columbia, Washington , D.C.