Is
- Isa Town, Central Governorate, Bahrain
- Isabel, Solomon Islands
- Isatkoak, Alaska, USA
- Isfahan, Iran
- Ishida, Ehime, Japan
- Ishikawa, Fukushima, Japan
- Ishikawa-ken, Japan
- Isiolo, Eastern, Kenya
- Isiolo, Kenya
- Iskenderun, Hatay, Turkey
- Islamabad, Pakistan
- Island County, Washington state, USA
- Island County, Washington, USA
- Island Lake, Manitoba, Canada
- Island Off The Coast Of Labrador, Labrador, Canada
- Island West Side Of Darnley Bay, Darnley Bay, Canada
- Isleta Pueblo, Washington, USA
- Isnik, Turkey
- Israel
- Istalif, Kabul, Afghanistan
- Istanbul, Istanbul, Turkey
- Istanbul, Turkey
ItIuIv
- Ivigtut, Greenland
- Ivilik, Canada
- Ivujivik, Quebec, Canada
- Ivujivik Village, Quebec, Canada
- Ivujivilk Village, Quebec, Canada
- Ivujuvik, Northern Quebec, Canada
IwIxIzJa
- JA-1, Jamaica
- Jabel Buraiqa 1, Saudi Arabia
- Jacob Island, Lake And Peninsula Borough, Alaska, USA
- Jaffray, British Columbia, Canada
- Jagdalpur, Chhattisgarh, India
- Jaina, Campeche, Mexico
- Jaipur, Rajasthan, India
- Jaisalmer, Rajasthan, India
- Jakarta, Java, Indonesia
- Jalajala, Laguna, Philippines
- Jalieza, Santo Tomas, Mexico
- Jalisco, Mexico
- Jamaica
- Jambi, Indonesia
- James Bay, Canada
- Jamestown Bay, Sitka Harbor, Baranof Island, Sitka Borough, Alaska, USA
- Jammu-Kashmir, India
- Jamshedpur, Bihar, India
- Japan
- Japonski Island, Sitka, Baranof Island, Sitka Borough, Alaska, USA
- Japonski Island, Sitka Borough, Alaska, USA
- Jau Mishash El Hadi 1, Saudi Arabia
- Jau Mishash El Hadi 2, Saudi Arabia
- Java, Indonesia
- Jaynagar, West Bengal, India
Je
- Jefferson County, Washington state, USA
- Jemez Pueblo, New Mexico, USA
- Jequetopeque, Peru
- Jerbar, Sudan
- Jericho, British Columbia, Canada
- Jericho Beach, British Columbia, Canada
- Jerusalem, Israel
- Jervis Inlet, British Columbia, Canada
- Jess Property, British Columbia, Canada
JhJi
- Jiangsu, China
- Jiangxi, China
- Jianhe, Guizhou, China
- Jinan, Shandong, China
- Jingdezhen, Jiangxi, China
- Jingzhou, Hubei, China
- Jinjiang, Jiangxi, China
- Jizhou, Zhili, China
Jo
- Jodhpur, Rajasthan, India
- Johannesburg, South Africa
- Johnstone Strait, British Columbia, Canada
- Jolo Island, Philippines
- Jomon, Japan
- Joranda, Odisha, India
- Joranda, Orissa, India
- Jordan
Ju
- Juan de Fuca, British Columbia, Canada
- Juan Dolio, San Pedro de Marcoris, Dominican Republic
- Juan Pablo, Peru
- Juana, Indonesia
- Juazeiro, Bahia, Brazil
- Juchitan, Oaxaca, Mexico
- Juli, Puno, Peru
- Juliaca, Puno, Peru