| Název | Obyvatele | Nad. výška | Souřadnice | 
| Jack Springs | 
 | 2 172 m | 40°21' N; 108°42' W | 
| Jackson Field | 
 | 1 433 m | 40°24' N; 104°41' W | 
| Jamestown (Jamestown) | 193 | 2 133 m | 40°6' N; 105°23' W | 
| Jansen | 
 | 1 889 m | 37°8' N; 104°32' W | 
| Jaroso | 
 | 2 316 m | 37°0' N; 105°37' W | 
| Jasper | 
 | 2 865 m | 37°25' N; 106°27' W | 
| Jefferson | 
 | 2 903 m | 39°22' N; 105°47' W | 
| Jessica | 
 | 1 217 m | 40°45' N; 103°10' W | 
| Jessum | 
 | 1 492 m | 40°8' N; 105°1' W | 
| Joes | 
 | 1 310 m | 39°39' N; 102°40' W | 
| John Held Corner | 
 | 1 853 m | 39°8' N; 108°8' W | 
| Johnson | 
 | 1 474 m | 40°5' N; 104°26' W | 
| Johnson Village | 
 | 2 377 m | 38°48' N; 106°6' W | 
| Johnsons Corner | 
 | 1 448 m | 39°5' N; 108°29' W | 
| Johnstown (Johnstown) | 6 626 | 1 480 m | 40°20' N; 104°54' W | 
| Juanita | 
 | 1 950 m | 37°1' N; 107°9' W | 
| Juanita Junction | 
 | 1 828 m | 38°55' N; 107°31' W | 
| Julesburg (Julesburg) | 1 392 | 1 060 m | 40°59' N; 102°15' W | 
| Juniper Hot Springs | 
 | 1 829 m | 40°28' N; 107°57' W | 
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