Incheon has sister and friendly relations with various cities around the world.
Sister Cities (22 cities in 15 countries)
| Country | City | Date | Area(㎢) | Population (10,000 people) | Website |
|---|---|---|---|---|---|
| U.S.A | Burbank | 1961.12.18 | 44 | 10 | Go to Website |
| Philadelphia | 1983. 8.15 | 337 | 158 | Go to Website | |
| Anchorage | 1986.10. 7 | 5,180 | 30 | Go to Website | |
| Honolulu | 2003.10.15 | 1,560 | 36 | Go to Website | |
| Japan | Kitakyushu | 1988.12.20 | 492 | 94 | Go to Website |
| Kobe | 2010. 4. 6 | 553 | 152 | Go to Website | |
| China | Tianjin | 1993.12.7 | 11,946 | 1,557 | Go to Website |
| Chongqing | 2007. 6. 1 | 82,400 | 3,205 | Go to Website | |
| Shenyang | 2014. 6.12 | 12,980 | 907 | Go to Website | |
| Vietnam | Haiphong | 1997. 7.25 | 1,507 | 203 | Go to Website |
| Panama | Panama | 2000. 3.16 | 2,561 | 88 | Go to Website |
| Israel | Tel Aviv | 2000. 5.14 | 52 | 43 | Go to Website |
| Egypt | Alexandria | 2000. 5.17 | 2,819 | 520 | Go to Website |
| India | Kolkata | 2007.10.15 | 1,886 | 1,462 | Go to Website |
| Mexico | Merida | 2007.10.15 | 858 | 89 | |
| Philippines | Manila | 2008.10. 7 | 39 | 178 | Go to Website |
| Cambodia | Pnom Penh | 2009. 3.27 | 679 | 212 | Go to Website |
| Indonesia | Banten | 2009. 9.14 | 9,160 | 1,295 | |
| Russia | Yekaterinburg | 2009. 9.14 | 1,142 | 145 | Go to Website |
| Vladivostok | 2012. 6.30 | 600 | 67 | ||
| Italy | Veneto | 2010. 9. 6 | 18,391 | 486 | Go to Website |
| Mongolia | Ulaan Baatar | 2017. 5.24 | 4,704 | 160 | Go to Website |
Friendly Cities (17 cities in 8 countries)
| Country | City | Date | Area(㎢) | Population (10,000 people) | Website |
|---|---|---|---|---|---|
| China | Dalian | 1994. 4. 2 | 13,237 | 745 | Go to Website |
| Dandong | 1995. 9.23 | 15,200 | 219 | Go to Website | |
| Qingdao | 1995. 9.27 | 11,026 | 929 | ||
| Shantung | 2004. 2.16 | 157,600 | 10,153 | Go to Website | |
| Yantai | 2007. 3.29 | 13,740 | 650 | ||
| Harbin | 2009.11.10 | 53,840 | 1,001 | Go to Website | |
| Henan | 2012.11.29 | 170,000 | 9,937 | Go to Website | |
| Guangzhou | 2013.12. 6 | 7,434 | 1,867 | Go to Website | |
| Chengdu | 2023.10.23 | 14,335 | 2,127 | | |
| Taiwan | Taoyuan | 2009. 9.14 | 1,221 | 225 | Go to Website |
| Venezuela | Chacao | 1994. 5.11 | 3.6 | 6 | Go to Website |
| Brazil | Rio Grande do Sul | 2004. 3.29 | 282,062 | 1,128 | Go to Website |
| Philippines | Albay | 2008. 5. 9 | 2,565 | 132 | Go to Website |
| Japan | Yokohama | 2009.12.23 | 437 | 375 | Go to Website |
| Russia | Kronstadt | 2010. 9. 8 | 19 | 4 | Go to Website |
| U.S.A | Houston | 2010.10.20 | 1,558 | 210 | |
| Uzbekistan | Fergana | 2022.12.16 | 6,800 | 420 | Go to Website |
