Is 669 square miles as big as a City Block (Manhattan)?
It's about 200,000 times as big as a City Block (Manhattan)
The size of a City Block (Manhattan) is about 0.004 square miles.
(per Bridges, William - 1811 Commissioner's Plan for New York City) (approximate)
A Manhattan city block measures about 200 m between the Northeast-Southwest streets by about 60 m between the Northwest-Southeast streets for a total area of about 0.004 square miles. There are roughly 2,000 blocks within the city, representing one of the most prolific applications of the city planning grid plan in history.
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