Lisbon is about 8 times smaller than Austin.

Austin (map shows its 70 named neighbourhoods; the area covers the whole city) is approximately 829 sq km, while Lisbon (map shows its 24 named neighbourhoods; the area covers the whole city) is approximately 100 sq km, making Lisbon 12.07% the size of Austin.
Tip: This to-scale comparison of Austin vs. Lisbon uses the Mercator projection, which distorts the size of regions near the poles.
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