| Code | Name | Region |
|---|---|---|
| DEKAN | Kalenborn/ahrweiler | RP |
| DEKKR | Kalkar | NW |
| DE9HJ | Kalkofen | RP |
| DEKAL | Kall | NW |
| DEKTL | Kalletal | NW |
| DEKDT | Kallstadt | RP |
| DEKCE | Kalscheuren | NW |
| DE82W | Kaltenengers | RP |
| DEKKN | Kaltenkirchen | SH |
| DEKND | Kaltennordheim | TH |
| DEKDH | Kaltensundheim | TH |
| DE65V | Kalubbe | SH |
| DEKMN | Kamen | NW |
| DEJUL | Jungingen | BW |
| DEJUH | Junkerath | RP |
| DEJBG | Juterbog | BB |
| DE67S | Kaaks | SH |
| DEKAA | Kaarst | NW |
| DE63X | Kabelhorst | SH |
| DETAL | Kabelsketal | ST |
| DEKZH | Kabschutztal | SN |
| DEKC2 | Kachtenhausen | NW |
| DEZKH | Kaempfelbach | BW |
| DEKAM | Kahl Am Main | BY |
| DEKLQ | Kahla | TH |
| DEKA2 | Kaifenheim | RP |
| DEKA3 | Kail | RP |
| DEKMT | Kaimt | RP |
| DEKS2 | Kaisersbach | BW |
| DEHSK | Kaisersesch | RP |
| DEKLT | Kaiserslautern | RP |
| DEKAI | Kaisersmuhle | RP |
| DEKAO | Kakenstorf | NI |
| DEJOA | Joachimsthal | |
| DEZJM | Jockgrim | RP |
| DEZJG | Johannesberg | BY |
| DEJKS | Johanneskirchen | BY |
| DETWH | Johanngeorgenstadt | SN |
| DEJOH | Johannisberg | BE |
| DEJON | Johanniskirchen | BY |
| DEJFD | Johnsdorf | SN |
| DEJST | Johstadt | SN |
| DEJOR | Jork | NI |
| DEJSN | Jossen | NW |
| DEJBK | Jubek | SH |
| DEJHN | Juchen | NW |
| DEZJN | Juchen | NW |
| DEJUB | Judenbach | TH |
| DEJUM | Jugenheim | RP |
| DEJUI | Juist | NI |