San Francisco is about 2.6 times smaller than Little Rock.

Little Rock (map shows its 28 named neighbourhoods; the area covers the whole city) is approximately 314 sq km, while San Francisco (including the city proper only) is approximately 121 sq km, making San Francisco 38.53% the size of Little Rock.
Tip: This to-scale comparison of Little Rock vs. San Francisco uses the Mercator projection, which distorts the size of regions near the poles.
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