| State Name | County Name | City |
|---|---|---|
| Michigan | Iron | Iron River |
| Pennsylvania | Luzerne | Jackson - Luzerne |
| Florida | Duval | Jacksonville |
| California | Santa Cruz | Interlaken |
| Minnesota | Koochiching | International Falls |
| Minnesota | Dakota | Inver Grove Heights |
| Florida | Citrus | Inverness |
| Illinois | Cook | Inverness |
| Florida | Citrus | Inverness Highlands South |
| Florida | Polk | Inwood |
| New York | Nassau | Inwood |
| West Virginia | Berkeley | Inwood |
| Kansas | Allen | Iola |
| Florida | Lee | Iona |
| California | Amador | Ione |
| Michigan | Ionia | Ionia |
| Louisiana | Calcasieu | Iowa |
| Iowa | Johnson | Iowa City |
| Texas | Brazoria | Iowa Colony |
| Iowa | Hardin | Iowa Falls |
| Texas | Wichita | Iowa Park |
| Massachusetts | Essex | Ipswich |
| South Carolina | Lexington | Irmo |
| Michigan | Dickinson | Iron Mountain |
| Alabama | Jefferson | Irondale |
| Georgia | Clayton | Irondale |
| New York | Monroe | Irondequoit |
| Ohio | Lawrence | Ironton |
| Michigan | Gogebic | Ironwood |
| Hawaii | Honolulu | Iroquois Point |
| California | Orange | Irvine |
| Kentucky | Estill | Irvine |
| Texas | Dallas | Irving |
| New Jersey | Essex | Irvington |
| New York | Westchester | Irvington |
| Pennsylvania | Westmoreland | Irwin |
| Puerto Rico | Isabela | Isabela |
| Minnesota | Isanti | Isanti |
| New Jersey | Middlesex | Iselin |
| Michigan | Marquette | Ishpeming |
| California | Santa Barbara | Isla Vista |
| Florida | Monroe | Islamorada, Village of Islands |
| Illinois | Lake | Island Lake |
| New York | Nassau | Island Park |
| Florida | Collier | Island Walk |
| New York | Suffolk | Islandia |
| South Carolina | Charleston | Isle of Palms |
| New York | Suffolk | Islip |
| New York | Suffolk | Islip Terrace |
| Washington | King | Issaquah |
| Illinois | DuPage | Itasca |
| New York | Tompkins | Ithaca |
| Mississippi | Leflore | Itta Bena |
| Mississippi | Tishomingo | Iuka |
| California | Tulare | Ivanhoe |
| Florida | Miami-Dade | Ives Estates |
| Utah | Washington | Ivins |
| Texas | Harris | Jacinto City |
| Texas | Jack | Jacksboro |
| Alabama | Clarke | Jackson |
| California | Amador | Jackson |
| Georgia | Butts | Jackson |
| Louisiana | East Feliciana | Jackson |
| Michigan | Jackson | Jackson |
| Minnesota | Jackson | Jackson |
| Missouri | Cape Girardeau | Jackson |
| Mississippi | Hinds | Jackson |
| New Jersey | Ocean | Jackson |
| Ohio | Jackson | Jackson |
| Pennsylvania | Butler | Jackson - Butler |
| Pennsylvania | Cambria | Jackson - Cambria |
| Pennsylvania | York | Jackson - York |
| Pennsylvania | Lebanon | Jackson - Lebanon |
| Pennsylvania | Monroe | Jackson - Monroe |
| Tennessee | Madison | Jackson |
| Wisconsin | Washington | Jackson |
| Wyoming | Teton | Jackson |
| Alabama | Calhoun | Jacksonville |
| Arkansas | Pulaski | Jacksonville |
| Illinois | Morgan | Jacksonville |
| North Carolina | Onslow | Jacksonville |
| Oregon | Jackson | Jacksonville |
| Texas | Cherokee | Jacksonville |
| Florida | Duval | Jacksonville Beach |
| Pennsylvania | Berks | Jacksonwald |
| New Hampshire | Cheshire | Jaffrey |
| North Carolina | Craven | James City |
| South Carolina | Charleston | James Island |
| New Jersey | Middlesex | Jamesburg |
| California | Tuolumne | Jamestown |
| North Carolina | Guilford | Jamestown |
| North Dakota | Stutsman | Jamestown |
| New York | Chautauqua | Jamestown |
| Ohio | Greene | Jamestown |
| Rhode Island | Newport | Jamestown |
| California | San Diego | Jamul |
| Florida | Polk | Jan Phyl Village |
| Wisconsin | Rock | Janesville |
| Maryland | Harford | Jarrettsville |
| Florida | Pasco | Jasmine Estates |
