Stockholm is about 2.4 times bigger than Zurich.

Zurich is approximately 88 sq km, while Stockholm (map shows its 47 named neighbourhoods; the area covers the whole city) is approximately 207 sq km, making Stockholm 136% larger than Zurich.
Tip: This to-scale comparison of Zurich vs. Stockholm uses the Mercator projection, which distorts the size of regions near the poles.
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