| Name | Population | Altitude | Latitude | Longitude | 
| Jacinto : | 
 | 
 | 39°34'52.0" N | 122°0'21.6" W | 
| Jacksnipe : | 
 | 
 | 38°11'34.1" N | 122°4'1.2" W | 
| Jackson : | 
 | 
 | 38°20'56.0" N | 120°46'22.8" W | 
| Jacobs Corner : | 
 | 
 | 38°40'18.1" N | 121°53'34.8" W | 
| Jacumba : | 
 | 
 | 32°37'3.0" N | 116°11'20.4" W | 
| Jalama : | 
 | 
 | 34°29'53.2" N | 120°29'38.4" W | 
| Jamacha : | 
 | 
 | 32°44'30.1" N | 116°54'39.6" W | 
| Jamacha Junction : | 
 | 
 | 32°44'22.9" N | 116°56'31.2" W | 
| James : | 
 | 
 | 39°39'11.9" N | 121°32'56.4" W | 
| Jamesan : | 
 | 
 | 36°43'12.0" N | 120°12'32.4" W | 
| Jamesburg : | 
 | 
 | 36°22'10.9" N | 121°35'20.4" W | 
| Jamestown : | 
 | 
 | 37°57'11.9" N | 120°25'19.2" W | 
| Jamul : | 
 | 
 | 32°43'0.8" N | 116°52'30.0" W | 
| Janes Place : | 
 | 828 m | 40°47'21.8" N | 123°42'57.6" W | 
| Janesville : | 
 | 1 296 m | 40°17'48.1" N | 120°31'22.8" W | 
| Jarvis Landing : | 
 | 
 | 37°31'45.8" N | 122°3'43.2" W | 
| Jasmin : | 
 | 
 | 35°44'34.1" N | 119°8'38.4" W | 
| Jastro : | 
 | 
 | 35°22'36.1" N | 119°4'15.6" W | 
| Java : | 
 | 
 | 34°53'15.0" N | 114°43'33.6" W | 
| Jayhawk : | 
 | 
 | 38°43'53.0" N | 120°57'54.0" W | 
| Jefferson : | 
 | 
 | 34°1'5.9" N | 118°16'15.6" W | 
| Jefferson Park : | 
 | 
 | 34°1'37.9" N | 118°19'1.2" W | 
| Jellico : | 
 | 1 584 m | 40°50'42.0" N | 121°17'31.2" W | 
| Jenks Place : | 
 | 
 | 39°42'31.0" N | 122°50'49.2" W | 
| Jenner : | 
 | 
 | 38°26'58.9" N | 123°6'50.4" W | 
| Jenny Lind : | 
 | 
 | 38°5'42.0" N | 120°52'8.4" W | 
| Jerome : | 
 | 1 325 m | 41°43'54.1" N | 121°59'56.4" W | 
| Jerseydale : | 
 | 
 | 37°33'49.0" N | 119°51'21.6" W | 
| Jesmond Dene : | 
 | 
 | 33°10'49.1" N | 117°6'28.8" W | 
| Jesus Maria : | 
 | 
 | 38°17'8.2" N | 120°38'45.6" W | 
| Jet : | 
 | 
 | 37°25'58.1" N | 121°5'56.4" W | 
| Jewell : | 
 | 
 | 38°2'12.1" N | 122°44'42.0" W | 
| Jim Leggett Place : | 
 | 
 | 39°51'46.1" N | 123°25'8.4" W | 
| Jimgrey : | 
 | 
 | 34°58'36.8" N | 117°28'1.2" W | 
| Jims Camp : | 
 | 745 m | 41°49'59.2" N | 122°35'6.0" W | 
| Jimtown : | 
 | 
 | 38°40'0.1" N | 122°49'8.4" W | 
| Joes Landing : | 
 | 
 | 38°46'48.0" N | 121°36'10.8" W | 
| Joesphine : | 
 | 
 | 39°5'39.1" N | 121°47'60.0" W | 
| Jofegan : | 
 | 
 | 33°18'54.0" N | 117°19'51.6" W | 
| Johannesburg : | 
 | 
 | 35°22'22.1" N | 117°38'2.4" W | 
| Johnson Corner : | 
 | 
 | 34°18'25.9" N | 117°45'7.2" W | 
| Johnson Park : | 
 | 975 m | 40°55'4.1" N | 121°37'33.6" W | 
| Johnsondale : | 
 | 
 | 35°58'28.9" N | 118°32'24.0" W | 
| Johnsons : | 
 | 167 m | 41°21'2.2" N | 123°52'15.6" W | 
| Johnston Corner : | 
 | 
 | 36°55'43.0" N | 121°42'14.4" W | 
| Johnstons Corner : | 
 | 
 | 34°49'49.1" N | 117°10'44.4" W | 
| Johnstonville : | 
 | 1 279 m | 40°23'3.8" N | 120°35'9.6" W | 
| Johnstown : | 
 | 
 | 32°50'17.2" N | 116°53'45.6" W | 
| Johnsville : | 
 | 
 | 39°45'38.9" N | 120°41'38.4" W | 
| Jolon : | 
 | 
 | 35°58'14.9" N | 121°10'30.0" W | 
| Jonata Park : | 
 | 
 | 34°39'4.0" N | 120°10'58.8" W | 
| Jones Corner : | 
 | 
 | 36°3'56.9" N | 119°6'21.6" W | 
| Jones Place : | 
 | 
 | 38°50'58.9" N | 120°22'8.4" W | 
| Jonesville : | 
 | 1 525 m | 40°6'45.0" N | 121°27'57.6" W | 
| Joshua : | 
 | 
 | 35°16'16.0" N | 115°26'56.4" W | 
| Joshua Tree : | 
 | 
 | 34°8'4.9" N | 116°18'43.2" W | 
| Jovista : | 
 | 
 | 35°47'51.0" N | 119°10'55.2" W | 
| Juan : | 
 | 1 279 m | 35°21'59.0" N | 115°5'13.2" W | 
| Julian : | 
 | 
 | 33°4'43.0" N | 116°36'3.6" W | 
| Junction Camp : | 
 | 
 | 34°43'54.1" N | 119°58'44.4" W | 
| Junction City : | 
 | 487 m | 40°43'59.9" N | 123°3'7.2" W | 
| Junction House : | 
 | 
 | 39°44'26.2" N | 121°17'27.6" W | 
| Junction Ranch : | 
 | 
 | 36°4'26.0" N | 117°30'43.2" W | 
| June Lake : | 
 | 
 | 37°46'46.9" N | 119°4'26.4" W | 
| June Lake Junction : | 
 | 
 | 37°48'45.0" N | 119°3'10.8" W | 
| Juniper : | 
 | 1 323 m | 41°28'48.0" N | 120°34'19.2" W | 
| Juniper Hills : | 
 | 
 | 34°26'39.1" N | 117°56'2.4" W | 
| Juniper Springs : | 
 | 
 | 33°45'58.0" N | 117°4'58.8" W | 
| Jupiter : | 
 | 
 | 38°7'21.0" N | 120°16'55.2" W | 
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