The most common and most likely answer to this crossword clue is the 6 letter word VIENNA which also is the latest solution we found used in Newsday in 2012.
OPEC's headquarters crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| VIENNA | 100 % | 6 | 
Words with a meaning similar to the clue: OPEC's headquarters
These words may or may not be a possible solution to this crosswords clue.- qatar
 - vienna
 - arab
 - indonesia
 - iran
 - iraq
 - kuwait
 - libya
 - nigeria
 - oman
 - syria
 - cartel
 
Crossword Answer definitions
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution