| # | Population | Country | Answer | % Correct |
|---|---|---|---|---|
| 2 | 1,520,000 | Switzerland | Zürich | 100%
|
| 8 | 663,592 | Croatia | Zagreb | 96%
|
| 5 | 736,649 | Spain | Zaragoza | 94%
|
| 4 | 1,030,000 | Tanzania | Zanzibar | 84%
|
| 1 | 10,300,000 | China | Zhèngzhōu | 80%
|
| 6 | 710,052 | Ukraine | Zaporizhia | 71%
|
| 3 | 1,050,000 | Nigeria | Zaria | 55%
|
| 21 | 123,500 | Germany | Zwickau | 49%
|
| 20 | 125,820 | Netherlands | Zwolle | 49%
|
| 7 | 689,840 | Philippines | Zamboanga | 39%
|
| 11 | 235,605 | Niger | Zinder | 37%
|
| 10 | 405,285 | Mexico | Zacatecas - Guadalupe | 31%
|
| 9 | 587,730 | Iran | Zahedan | 29%
|
| 18 | 138,932 | Poland | Zielona Góra | 29%
|
| 28 | 80,634 | Slovakia | Žilina | 29%
|
| 13 | 214,874 | Senegal | Ziguinchor | 20%
|
| 16 | 158,597 | Russia | Zlatoust | 18%
|
| 22 | 116,800 | Malawi | Zomba | 12%
|
| 17 | 140,000 | Lebanon | Zahlé | 8%
|
| 15 | 166,350 | Libya | Zliten | 6%
|
| 27 | 86,502 | Uzbekistan | Zarafshon | 4%
|
| 12 | 223,017 | Taiwan | Zhubei | 4%
|
| 26 | 101,749 | Turkey | Zonguldak | 4%
|
| 14 | 211,964 | Iraq | Zākhū | 2%
|
| 25 | 109,400 | Argentina | Zárate | 2%
|
| 29 | 77,049 | Belarus | Zlobin | 2%
|
| 24 | 113,119 | Jordan | Zaatari Camp | 0%
|
| 30 | 75,900 | Tunisia | Zarzis | 0%
|
| 23 | 115,774 | Egypt | Ziftā | 0%
|
| 19 | 131,900 | Colombia | Zipaquirá | 0%
|