Los Angeles is about 18 times bigger than Arlington.

Arlington (map shows its 62 named neighbourhoods; the area covers the whole city) is approximately 67 sq km, while Los Angeles (including the city proper only) is approximately 1,215 sq km, making Los Angeles 1,704% larger than Arlington.
Tip: This to-scale comparison of Arlington vs. Los Angeles uses the Mercator projection, which distorts the size of regions near the poles.
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