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How big is 650 city blocks?

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It's about 2,500,000,000 times as big as a Post-it® Note (3M)
In other words, the size of a Post-it® Note (3M) is 0.000000000380 times 650 city blocks.
(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 0.000000250 city blocks in total area. In September, 1989, Hurricane Hugo swept through Charleston, South Carolina with winds up to 230 kph (140 mph), uprooting eight oak trees in Mr. Bruce Brakefield's yard, but leaving in place a Post-it® note attached to his front door.
It's about 20,000,000,000 times as big as a Secure Digital (SD) card
In other words, 650 city blocks is 18,000,000,000 times the size of a Secure Digital (SD) card, and the size of a Secure Digital (SD) card is 0.0000000000560 times that amount.
A Secure Digital (SD) card measures 3.2 cm by 2.4 cm for a total area of 0.0000000350 city blocks. SDXC Cards, the latest standard for the technology, will allow the cards to hold up to 2 terabytes of data.
It's about 30,000,000,000 times as big as a Quarter
In other words, 650 city blocks is 30,530,000,000 times the size of a Quarter, and the size of a Quarter is 0.000000000032750 times that amount.
(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. Washington quarter, a.k.a. two bits)
The George Washington quarter, in circulation in various forms since 1932, has a diameter of 24.26 mm (0.955 in) and an area of 0.000000021290 city blocks.
It's about 40,000,000,000 times as big as a Nickel
In other words, 650 city blocks is 39,940,000,000 times the size of a Nickel, and the size of a Nickel is 0.000000000025040 times that amount.
(United States five-cent coin) (a.k.a. Jefferson nickel)
The nickel, in its current design since 1938, has a diameter of 21.21 mm (0.835 in) and an area of 0.000000016280 city blocks.
It's about 40,000,000,000 times as big as a Postage Stamp
In other words, the size of a Postage Stamp is 0.0000000000300 times 650 city blocks.
(average; United States dimensions)
A typical postage stamp measures an average of 0.0000000200 city blocks. One of the most prized stamps among collectors is the US-issued "Inverted Jenny" stamp printed in 1918, which features an upside-down image of Curtiss JN-4 ("Jenny") airplane; a single stamp sold for $977,500 at a 2007 auction.
It's about 50,000,000,000 times as big as a Penny
In other words, 650 city blocks is 49,500,000,000 times the size of a Penny, and the size of a Penny is 0.00000000002020 times that amount.
(United States one-cent coin) (a.k.a. Lincoln penny, a.k.a. Cent, a.k.a. One cent piece)
The Lincoln penny, in its current design since 1909, has a diameter of 19.05 mm (0.75 in) and an area of 0.00000001310 city blocks.
It's about 55,000,000,000 times as big as a Dime
In other words, 650 city blocks is 56,020,000,000 times the size of a Dime, and the size of a Dime is 0.000000000017850 times that amount.
(United States ten-cent coin) (a.k.a. Roosevelt dime)
The dime, in its current design since 1946, has a diameter of 17.91 mm (0.705 in) and an area of 0.00000001160 city blocks.