- Ja-Ela [1]
- Jacksboro [3]
- Jackson [750]
- Jackson Center [3]
- Jacksonville [548]
- Jacksonville Beach [14]
- Jacumba Hot Springs [20]
- Jaffrey [2]
- Jaipur [1]
- Jamesburg [1]
- Jamestown [264]
- Jamesville [1]
- Jamison [6]
- Jamul [632]
- Janesville [82]
- Jarrettsville [2]
- Jasonville [1]
- Jasper [20]
- Jay [2]
- Jean [4]
- Jeannette [10]
- Jefferson [15]
- Jefferson City [21]
- Jefferson Hills [1]
- Jefferson Valley-Yorktown [1]
- Jeffersontown [13]
- Jeffersonville [18]
- Jena [1]
- Jenkintown [11]
- Jenks [4]
- Jenner [29]
- Jennings [2]
- Jensen Beach [12]
- Jericho [235]
- Jerome [14]
- Jersey City [188]
- Jersey Village [5]
- Jerseyville [3]
- Jerusalem [3]
- Jessup [14]
- Jesup [1]
- Jim Thorpe [1]
- Jimena de la Frontera [1]
- Jinan Shi [1]
- Johannesburg [10]
- John Day [2]
- Johns Creek [17]
- Johns Island [2]
- Johnson City [14]
- Johnson Creek [3]
- Johnson Valley [6]
- Johnston [20]
- Johnstown [22]
- Joliet [22]
- Jolon [2]
- Jones [3]
- Jones Mills [1]
- Jonesboro [21]
- Jonesborough [1]
- Jonesburg [1]
- Jonesport [1]
- Jonestown [5]
- Joplin [34]
- Jordan [3]
- Jordan Valley [2]
- Jordanville [1]
- Joseph [3]
- Joshua [1]
- Joshua Tree [259]
- Jouars-Pontchartrain [1]
- Judsonia [1]
- Julian [257]
- Junction City [37]
- June Lake [79]
- Juneau [13]
- Juniper Hills [1]
- Juno Beach [4]
- Jupiter [82]
- Jurupa Valley [770]
- Justice [1]