Tempe is about 12 times smaller than Los Angeles.

Los Angeles (including the city proper only) is approximately 1,215 sq km, while Tempe (map shows its 64 named neighbourhoods; the area covers the whole city) is approximately 104 sq km, making Tempe 8.52% the size of Los Angeles.
Tip: This to-scale comparison of Los Angeles vs. Tempe uses the Mercator projection, which distorts the size of regions near the poles.
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