| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Zabaykalsk | city | Irkutskaya Oblast' | Russia | 51.7208333 | 103.6955556 | 1561 | 701 |
| Zabiyakina | city | Irkutskaya Oblast' | Russia | 55.5666667 | 97.95 | 1177 | 109 |
| Zabiyakino | city | Irkutskaya Oblast' | Russia | 55.5666667 | 97.95 | 1177 | 109 |
| Zablagar | city | Irkutskaya Oblast' | Russia | 53.4322222 | 102.1083333 | 1709 | 406 |
| Zaboka | city | Irkutskaya Oblast' | Russia | 54.5666667 | 101.6333333 | 1817 | 345 |
| Zabor | city | Irkutskaya Oblast' | Russia | 54.3644444 | 100.6233333 | 1725 | 187 |
| Zabor'ye | city | Irkutskaya Oblast' | Russia | 57.5833333 | 107.85 | 908 | 56 |
| Zabrodskaya | city | Irkutskaya Oblast' | Russia | 55.0333333 | 107.2833333 | 2306 | 75 |
| Zabrody | city | Irkutskaya Oblast' | Russia | 55.0333333 | 107.2833333 | 2306 | 75 |
| Zagata | city | Irkutskaya Oblast' | Russia | 52.6333333 | 105.6333333 | 2221 | 130 |
| Zagli | city | Irkutskaya Oblast' | Russia | 53.0355556 | 106.9669444 | 2132 | 52 |
| Zagota | city | Irkutskaya Oblast' | Russia | 52.6333333 | 105.6333333 | 2221 | 130 |
| Zagotzerno | city | Irkutskaya Oblast' | Russia | 55.85 | 101.7 | 1315 | 50 |
| Zagulan | city | Irkutskaya Oblast' | Russia | 54.0666667 | 106.45 | 2017 | 61 |
| Zagvozdina | city | Irkutskaya Oblast' | Russia | 53.25 | 103.15 | 1984 | 30663 |
| Zaimka | city | Irkutskaya Oblast' | Russia | 56.1469444 | 98.2175 | 784 | 103 |
| Zaimka Sal'nikova | city | Irkutskaya Oblast' | Russia | 53.9166667 | 102.0666667 | 1489 | 11045 |
| Zaimka Sisina | city | Irkutskaya Oblast' | Russia | 58.5 | 116.2166667 | 2847 | 14 |
| Zakamenskaya | city | Irkutskaya Oblast' | Russia | 55.2333333 | 105.4 | 1338 | 42 |
| Zakamenskoye | city | Irkutskaya Oblast' | Russia | 55.2333333 | 105.4 | 1338 | 42 |
| Zakharova | city | Irkutskaya Oblast' | Russia | 56.1666667 | 99.8166667 | 912 | 168 |
| Zakharova | city | Irkutskaya Oblast' | Russia | 54.35 | 104.7333333 | 1807 | 42 |
| Zakharovo | city | Irkutskaya Oblast' | Russia | 56.1666667 | 99.8166667 | 912 | 168 |
| Zakobenina | city | Irkutskaya Oblast' | Russia | 55.7833333 | 105.7333333 | 2027 | 43 |
| Zakobenino | city | Irkutskaya Oblast' | Russia | 55.7833333 | 105.7333333 | 2027 | 43 |
| Zakryty | city | Irkutskaya Oblast' | Russia | 57.2666667 | 115.1333333 | 3713 | 14 |
| Zakrytyy | city | Irkutskaya Oblast' | Russia | 57.2666667 | 115.1333333 | 3713 | 14 |
| Zakur'ya | city | Irkutskaya Oblast' | Russia | 56.8833333 | 108.15 | 994 | 70 |
| Zakurayevo | city | Irkutskaya Oblast' | Russia | 57 | 102.3166667 | 1240 | 46 |
| Zakurdayeva | city | Irkutskaya Oblast' | Russia | 57 | 102.3166667 | 1240 | 46 |
| Zakurdayevo | city | Irkutskaya Oblast' | Russia | 57 | 102.3166667 | 1240 | 46 |
| Zakuy | city | Irkutskaya Oblast' | Russia | 54.8 | 103.0166667 | 1318 | 108 |
| Zalari | city | Irkutskaya Oblast' | Russia | 53.5627778 | 102.5086111 | 1532 | 406 |
| Zalichnyy | city | Irkutskaya Oblast' | Russia | 52.05 | 105.4333333 | 1522 | 345 |
| Zalog | city | Irkutskaya Oblast' | Russia | 53.9380556 | 106.3825 | 1932 | 61 |
| Zama | city | Irkutskaya Oblast' | Russia | 53.4655556 | 107.5058333 | 1541 | 58 |
| Zamanski | city | Irkutskaya Oblast' | Russia | 53.4655556 | 107.5058333 | 1541 | 58 |
| Zamanskiy | city | Irkutskaya Oblast' | Russia | 53.4655556 | 107.5058333 | 1541 | 58 |
| Zamorskiy | city | Irkutskaya Oblast' | Russia | 57.0836111 | 103.2163889 | 1010 | 310 |
| Zamzor | city | Irkutskaya Oblast' | Russia | 55.365 | 98.6402778 | 1069 | 61 |
| Zangaryk | city | Irkutskaya Oblast' | Russia | 54.15 | 100.45 | 1653 | 187 |
| Zapleskina | city | Irkutskaya Oblast' | Russia | 54.3833333 | 105.2 | 1656 | 42 |
| Zapleskino | city | Irkutskaya Oblast' | Russia | 54.3833333 | 105.2 | 1656 | 42 |
| Zapleskinskaya | city | Irkutskaya Oblast' | Russia | 54.3833333 | 105.2 | 1656 | 42 |
| Zaplëskino | city | Irkutskaya Oblast' | Russia | 54.3833333 | 105.2 | 1656 | 42 |
| Zaporozhskiy | city | Irkutskaya Oblast' | Russia | 55.2833333 | 101.3666667 | 1587 | 213 |
| Zaporozhskiy Vtoroy | city | Irkutskaya Oblast' | Russia | 55.2833333 | 101.3666667 | 1587 | 213 |
| Zarb' | city | Irkutskaya Oblast' | Russia | 55.4333333 | 101.0333333 | 1397 | 202 |
| Zarechnaya | city | Irkutskaya Oblast' | Russia | 55.9777778 | 97.7519444 | 869 | 103 |
| Zarechnaya | city | Irkutskaya Oblast' | Russia | 53.4116667 | 106.1061111 | 1889 | 64 |
| Zarechnaya | city | Irkutskaya Oblast' | Russia | 54.9833333 | 107.2833333 | 2644 | 75 |
| Zarechnaya | city | Irkutskaya Oblast' | Russia | 56.4 | 107.7 | 1555 | 70 |
| Zarechnoye | city | Irkutskaya Oblast' | Russia | 55.9777778 | 97.7519444 | 869 | 103 |
| Zarechnoye | city | Irkutskaya Oblast' | Russia | 53.4116667 | 106.1061111 | 1889 | 64 |
| Zarechny | city | Irkutskaya Oblast' | Russia | 55.6166667 | 103.95 | 1400 | 75 |
| Zarechnyy | city | Irkutskaya Oblast' | Russia | 56.2666667 | 98.3333333 | 1210 | 103 |
| Zarechnyy | city | Irkutskaya Oblast' | Russia | 55.6166667 | 103.95 | 1400 | 75 |
| Zarechnyy | city | Irkutskaya Oblast' | Russia | 52.05 | 105.4333333 | 1522 | 345 |
| Zarechnyy | city | Irkutskaya Oblast' | Russia | 56.4 | 107.7 | 1555 | 70 |
| Zarubina | city | Irkutskaya Oblast' | Russia | 57.4166667 | 102.8666667 | 1223 | 200 |
| Zaslavskaya | city | Irkutskaya Oblast' | Russia | 54.2133333 | 102.9675 | 1358 | 74 |
| Zatayevskiy | city | Irkutskaya Oblast' | Russia | 54.7166667 | 100.2333333 | 1902 | 187 |
| Zausayevo | city | Irkutskaya Oblast' | Russia | 54.6308333 | 100.5163889 | 1637 | 24546 |
| Zaval' | city | Irkutskaya Oblast' | Russia | 54.6838889 | 102.0638889 | 1318 | 320 |
| Zayarsk | city | Irkutskaya Oblast' | Russia | 56.195 | 102.8313889 | 1374 | 110 |
| Zayarsk Pervyy | city | Irkutskaya Oblast' | Russia | 56.2 | 102.7833333 | 1315 | 68 |
| Zdravoozernyy | city | Irkutskaya Oblast' | Russia | 54.05 | 100.6666667 | 1699 | 187 |
| Zdravoozërnyy | city | Irkutskaya Oblast' | Russia | 54.05 | 100.6666667 | 1699 | 187 |
| Zekhina | city | Irkutskaya Oblast' | Russia | 56.2333333 | 105.7 | 1469 | 47 |
| Zelenyy Dol | city | Irkutskaya Oblast' | Russia | 55.3333333 | 102 | 1584 | 229 |
| Zelenyye Gorki | city | Irkutskaya Oblast' | Russia | 52.3341667 | 103.4369444 | 1742 | 733 |
| Zelënyy Dol | city | Irkutskaya Oblast' | Russia | 55.3333333 | 102 | 1584 | 229 |
| Zelënyye Gorki | city | Irkutskaya Oblast' | Russia | 52.3341667 | 103.4369444 | 1742 | 733 |
| Zentsovo | city | Irkutskaya Oblast' | Russia | 55.3666667 | 99.3833333 | 1046 | 61 |
| Zentsovskaya | city | Irkutskaya Oblast' | Russia | 55.3666667 | 99.3833333 | 1046 | 61 |
| Zerma | city | Irkutskaya Oblast' | Russia | 55.7666667 | 103.0666667 | 1709 | 140 |
| Zhalgay | city | Irkutskaya Oblast' | Russia | 53.1361111 | 102.3286111 | 1712 | 465 |
| Zhardovnik | city | Irkutskaya Oblast' | Russia | 52.45 | 103.9333333 | 1423 | 469 |
| Zhargon | city | Irkutskaya Oblast' | Russia | 53.1858333 | 103.025 | 1994 | 35412 |
| Zharikey | city | Irkutskaya Oblast' | Russia | 54.8666667 | 100.8333333 | 1620 | 183 |
| Zharkovka | city | Irkutskaya Oblast' | Russia | 54.9 | 105.05 | 1509 | 42 |
| Zhdanikha | city | Irkutskaya Oblast' | Russia | 57.1666667 | 103.9333333 | 980 | 350 |
| Zhdanova | city | Irkutskaya Oblast' | Russia | 60.2077778 | 108.0488889 | 1010 | 5 |
| Zhdanovo | city | Irkutskaya Oblast' | Russia | 60.2077778 | 108.0488889 | 1010 | 5 |
| Zhedoty | city | Irkutskaya Oblast' | Russia | 53.2333333 | 101.8666667 | 1833 | 406 |
| Zheleznodorozhnyy | city | Irkutskaya Oblast' | Russia | 57.9122222 | 102.7652778 | 1167 | 37 |
| Zheleznodorozhnyy | city | Irkutskaya Oblast' | Russia | 52.6752778 | 103.7475 | 1437 | 647 |
| Zheleznogorsk | city | Irkutskaya Oblast' | Russia | 56.5738889 | 104.1238889 | 1279 | 355 |
| Zheleznogorsk-Ilimskiy | city | Irkutskaya Oblast' | Russia | 56.5738889 | 104.1238889 | 1279 | 355 |
| Zherakovskaya | city | Irkutskaya Oblast' | Russia | 53.5852778 | 102.3461111 | 1633 | 403 |
| Zherikey | city | Irkutskaya Oblast' | Russia | 54.8666667 | 100.8333333 | 1620 | 183 |
| Zhigalovo | city | Irkutskaya Oblast' | Russia | 54.8097222 | 105.1577778 | 1351 | 42 |
| Zhilishche | city | Irkutskaya Oblast' | Russia | 56.95 | 102.2333333 | 1555 | 55 |
| Zhilishche | city | Irkutskaya Oblast' | Russia | 55.2666667 | 102.3 | 1437 | 145 |
| Zhitova | city | Irkutskaya Oblast' | Russia | 53.9472222 | 105.4163889 | 2017 | 61 |
| Zhiznevka | city | Irkutskaya Oblast' | Russia | 53.3061111 | 102.1305556 | 1788 | 476 |
| Zhmurova | city | Irkutskaya Oblast' | Russia | 53.1347222 | 102.9236111 | 1938 | 299 |
| Zhmurovskiy | city | Irkutskaya Oblast' | Russia | 54.05 | 101.3 | 1509 | 330 |
| Zhukovo | city | Irkutskaya Oblast' | Russia | 54.5333333 | 99.9 | 1807 | 173 |
| Zhuravlinka | city | Irkutskaya Oblast' | Russia | 54.7166667 | 100.1833333 | 1906 | 187 |
| Zhuya | city | Irkutskaya Oblast' | Russia | 58.8 | 118.2 | 1112 | 12 |
| Zilishche | city | Irkutskaya Oblast' | Russia | 56.95 | 102.2333333 | 1555 | 55 |
| Zima | city | Irkutskaya Oblast' | Russia | 53.8833333 | 101.9833333 | 1555 | 12917 |
| Zima | city | Irkutskaya Oblast' | Russia | 53.9280556 | 102.0441667 | 1519 | 11045 |
| Zimnik Baranova | city | Irkutskaya Oblast' | Russia | 53.1166667 | 103.0833333 | 1925 | 299 |
| Zimnik Dorofeyeva | city | Irkutskaya Oblast' | Russia | 53.1333333 | 103 | 1922 | 15786 |
| Zimnik Khudugun | city | Irkutskaya Oblast' | Russia | 53.2552778 | 103.1844444 | 1876 | 705 |
| Zimnik Ogorodnikova | city | Irkutskaya Oblast' | Russia | 53.1166667 | 103.0333333 | 1981 | 299 |
| Zimnik Protasova | city | Irkutskaya Oblast' | Russia | 53.055556 | 102.9536111 | 1899 | 299 |
| Zimnik Semeykina | city | Irkutskaya Oblast' | Russia | 53.1166667 | 102.9666667 | 2017 | 299 |
| Zimnik Shadrina | city | Irkutskaya Oblast' | Russia | 53.1769444 | 103.0822222 | 1919 | 84861 |
| Zimnik Suvorova | city | Irkutskaya Oblast' | Russia | 57.7666667 | 115.0166667 | 2706 | 14 |
| Zimnik Zagvozdina | city | Irkutskaya Oblast' | Russia | 53.25 | 103.15 | 1984 | 30663 |
| Zimov'ye Semikacha | city | Irkutskaya Oblast' | Russia | 58.7666667 | 115.9833333 | 1807 | 14 |
| Zimov'ye Simikacha | city | Irkutskaya Oblast' | Russia | 58.7666667 | 115.9833333 | 1807 | 14 |
| Zimov'ye Siskovo | city | Irkutskaya Oblast' | Russia | 57.4166667 | 116.4666667 | 1141 | 14 |
| Zimovka Lenskaya | city | Irkutskaya Oblast' | Russia | 53.0333333 | 102.7833333 | 1811 | 304 |
| Zimovnik Simikacha | city | Irkutskaya Oblast' | Russia | 58.7666667 | 115.9833333 | 1807 | 14 |
| Zmeinova | city | Irkutskaya Oblast' | Russia | 57.7763889 | 108.3016667 | 823 | 56 |
| Zmeinovo | city | Irkutskaya Oblast' | Russia | 57.7763889 | 108.3016667 | 823 | 56 |
| Znamenka | city | Irkutskaya Oblast' | Russia | 54.7038889 | 104.8355556 | 1446 | 42 |
| Zobinskiy | city | Irkutskaya Oblast' | Russia | 54.9422222 | 101.9516667 | 1906 | 350 |
| Zoblagar | city | Irkutskaya Oblast' | Russia | 53.4322222 | 102.1083333 | 1709 | 406 |
| Zogi | city | Irkutskaya Oblast' | Russia | 52.4672222 | 105.5147222 | 2290 | 470 |
| Zogi | city | Irkutskaya Oblast' | Russia | 52.4833333 | 105.6 | 2421 | 470 |
| Zolotoy Yar | city | Irkutskaya Oblast' | Russia | 58.75 | 116.9 | 2316 | 14 |
| Zolotoye Ruslo | city | Irkutskaya Oblast' | Russia | 58.4 | 115.4166667 | 2001 | 14 |
| Zolotoye Ust'ye | city | Irkutskaya Oblast' | Russia | 58.7333333 | 116.9166667 | 3320 | 14 |
| Zubreshka | city | Irkutskaya Oblast' | Russia | 53.3855556 | 102.0433333 | 1742 | 406 |
| Zugduk | city | Irkutskaya Oblast' | Russia | 53.4 | 107.4 | 1778 | 62 |
| Zulman | city | Irkutskaya Oblast' | Russia | 53.7855556 | 105.3808333 | 2460 | 61 |
| Zulumay | city | Irkutskaya Oblast' | Russia | 53.6883333 | 101.3175 | 1660 | 196 |
| Zungut | city | Irkutskaya Oblast' | Russia | 52.4833333 | 105.5666667 | 2319 | 470 |
| Zusay | city | Irkutskaya Oblast' | Russia | 54.2 | 106.25 | 2582 | 61 |
| Zuy | city | Irkutskaya Oblast' | Russia | 52.45 | 104.0666667 | 1338 | 433 |
| Zuyeva | city | Irkutskaya Oblast' | Russia | 53.5436111 | 105.9833333 | 1830 | 61 |
| Zverevo | city | Irkutskaya Oblast' | Russia | 52.3913889 | 103.9411111 | 1423 | 476 |
| Zvezdnyy | city | Irkutskaya Oblast' | Russia | 56.7530556 | 106.4813889 | 1200 | 47 |
| Zvezdochka | city | Irkutskaya Oblast' | Russia | 52.3491667 | 103.6480556 | 1486 | 733 |
| Zvëzdnyy | city | Irkutskaya Oblast' | Russia | 56.7530556 | 106.4813889 | 1200 | 47 |
| Zyat'ya | city | Irkutskaya Oblast' | Russia | 57.6 | 102.7833333 | 1207 | 87 |
| Zykova | city | Irkutskaya Oblast' | Russia | 53.8833333 | 99.4 | 3559 | 187 |
| Zyryanova | city | Irkutskaya Oblast' | Russia | 53.1961111 | 103.0447222 | 1945 | 84861 |
| Zyryanova | city | Irkutskaya Oblast' | Russia | 57.0833333 | 103.4 | 826 | 163 |
| Zyryanovka | city | Irkutskaya Oblast' | Russia | 55.9 | 97.4333333 | 1230 | 103 |
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