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This probably varies from city to city, and building code to building code. When I was growing up in the city of Detroit, sidewalk squares were 5' x 5'.
The measurement of a city square block is not exact as it will vary from city to city. However, as a rough guide, in Portland, Sacromento and Houston a standard block would be 260 feet by 260 feet.
In a standard urban setting, there are typically 8 city blocks in an acre. Therefore, in 40 acres, there would be approximately 320 city blocks. This calculation assumes a consistent block size and layout, which may vary depending on the city's design and infrastructure.
a square block would be 264 x 1056 = 278,784 square feet, which is equal to 6.4 acres.
New York City at 8683 sq. kilometers