| State Name | County Name | City |
|---|---|---|
| Idaho | Jerome | Jerome |
| Pennsylvania | Lackawanna | Jessup |
| Alabama | Walker | Jasper |
| Florida | Hamilton | Jasper |
| Georgia | Pickens | Jasper |
| Indiana | Dubois | Jasper |
| Tennessee | Marion | Jasper |
| Texas | Jasper | Jasper |
| Maine | Franklin | Jay |
| Louisiana | Jefferson | Jean Lafitte |
| Louisiana | Iberia | Jeanerette |
| Pennsylvania | Westmoreland | Jeannette |
| Georgia | Jackson | Jefferson |
| Iowa | Greene | Jefferson |
| Louisiana | Jefferson | Jefferson |
| North Carolina | Ashe | Jefferson |
| New Jersey | Morris | Jefferson |
| Ohio | Ashtabula | Jefferson |
| Oregon | Marion | Jefferson |
| Pennsylvania | Butler | Jefferson - Butler |
| Pennsylvania | Lackawanna | Jefferson - Lackawanna |
| Wisconsin | Jefferson | Jefferson |
| Missouri | Cole | Jefferson City |
| Tennessee | Jefferson | Jefferson City |
| Pennsylvania | Allegheny | Jefferson Hills |
| New York | Westchester | Jefferson Valley-Yorktown |
| Kentucky | Jefferson | Jeffersontown |
| Indiana | Clark | Jeffersonville |
| Louisiana | LaSalle | Jena |
| Michigan | Ottawa | Jenison |
| Pennsylvania | Luzerne | Jenkins |
| Pennsylvania | Montgomery | Jenkintown |
| Oklahoma | Tulsa | Jenks |
| Pennsylvania | Forest | Jenks |
| Pennsylvania | Somerset | Jenner |
| Louisiana | Jefferson Davis | Jennings |
| Missouri | St. Louis | Jennings |
| Oregon | Clackamas | Jennings Lodge |
| Florida | Martin | Jensen Beach |
| New York | Nassau | Jericho |
| Vermont | Chittenden | Jericho |
| New Jersey | Hudson | Jersey City |
| Pennsylvania | Lycoming | Jersey Shore |
| Texas | Harris | Jersey Village |
| Illinois | Jersey | Jerseyville |
| New York | Yates | Jerusalem |
| Maryland | Anne Arundel | Jessup |
| Georgia | Wayne | Jesup |
| Connecticut | New London | Jewett City |
| Pennsylvania | Carbon | Jim Thorpe |
| Georgia | Fulton | Johns Creek |
| Illinois | McHenry | Johnsburg |
| Arkansas | Washington | Johnson |
| Vermont | Lamoille | Johnson |
| New York | Broome | Johnson City |
| Tennessee | Washington | Johnson City |
| Wisconsin | Jefferson | Johnson Creek |
| Nevada | Douglas | Johnson Lane |
| Iowa | Polk | Johnston |
| Rhode Island | Providence | Johnston |
| Illinois | Williamson | Johnston City |
| Colorado | Weld | Johnstown |
| New York | Fulton | Johnstown |
| Ohio | Licking | Johnstown |
| Pennsylvania | Cambria | Johnstown |
| Illinois | Will | Joliet |
| Oklahoma | Oklahoma | Jones |
| Texas | Brazoria | Jones Creek |
| Arkansas | Craighead | Jonesboro |
| Georgia | Clayton | Jonesboro |
| Louisiana | Jackson | Jonesboro |
| Tennessee | Washington | Jonesborough |
| Missouri | Jasper | Joplin |
| Maryland | Harford | Joppatowne |
| Minnesota | Scott | Jordan |
| Texas | Johnson | Joshua |
| California | San Bernardino | Joshua Tree |
| Texas | Atascosa | Jourdanton |
| Puerto Rico | Juana Díaz | Juana Díaz |
| Puerto Rico | Juncos | Juncos |
| Kansas | Geary | Junction City |
| Oregon | Lane | Junction City |
| Florida | Brevard | June Park |
| Alaska | Juneau | Juneau |
| Florida | Palm Beach | Juno Beach |
| Florida | Palm Beach | Jupiter |
| Florida | Palm Beach | Jupiter Farms |
| California | Riverside | Jurupa Valley |
| Illinois | Cook | Justice |
| Texas | Denton | Justin |
| Michigan | Marquette | K. I. Sawyer |
| Arizona | Coconino | Kachina Village |
| Hawaii | Honolulu | Kahaluu |
| Hawaii | Hawaii | Kahaluu-Keauhou |
| Hawaii | Maui | Kahului |
| Hawaii | Honolulu | Kailua |
| Hawaii | Kauai | Kalaheo |
| Washington | Cowlitz | Kalama |
| Michigan | Kalamazoo | Kalamazoo |
| Hawaii | Hawaii | Kalaoa |
