El Paso is about 1.2 times smaller than Austin.

Austin (map shows its 70 named neighbourhoods; the area covers the whole city) is approximately 829 sq km, while El Paso is approximately 670 sq km, making El Paso 80.9% the size of Austin.
Tip: This to-scale comparison of Austin vs. El Paso uses the Mercator projection, which distorts the size of regions near the poles.
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