| Code | Name | Region |
|---|---|---|
| CHA8T | Avegno | TI |
| CHAVE | Avenches | VD |
| CHAVR | Avry | FR |
| CHAYE | Ayent | VS |
| CHASN | Altstatten | SG |
| CHBEG | Amlikon-bissegg | TG |
| CHAWL | Amriswil | TG |
| CHLFI | Andelfingen | ZH |
| CHAND | Andwil | SG |
| CHAGE | Anieres | GE |
| CHANW | Anwil | BL |
| CHAPP | Appenzell | AI |
| CHAPL | Apples | VD |
| CH3JK | Arbaz | VS |
| CHABD | Arbedo | TI |
| CHZDD | Arbon | TG |
| CHARC | Arch | BE |
| CHAOC | Arconciel | FR |
| CHADO | Ardon | VS |
| CHADF | Arisdorf | BL |
| CHATU | Aristau | AG |
| CHASH | Arlesheim | BL |
| CHAGG | Arnegg | SG |
| CHARL | Arolla | VS |
| CHAEH | Aesch Bei Birmensdorf | ZH |
| CHXRE | Aeugst Am Albis | ZH |
| CHAFF | Affeltrangen | TG |
| CHAFT | Affoltern Am Albis | ZH |
| CHAIE | Affoltern Im Emmental | BE |
| CHAGO | Agno | TI |
| CHAIG | Aigle | VD |
| CHAIR | Airolo | TI |
| CHALZ | Alberswil | LU |
| CHAFH | Alchenflueh | BE |
| CHALL | Allaman | VD |
| CHALE | Alle | JU |
| CHASW | Allschwil | BL |
| CHAPD | Alpnach Dorf | OW |
| CHATH | Alpthal | SZ |
| CHARB | Altdorf | |
| CHALT | Altendorf | SZ |
| CHATR | Altenrhein | SG |
| CHAHF | Altishofen | LU |
| CHATN | Altnau | TG |
| CH | ||
| CHARF | Aadorf | TG |
| CHAAR | Aarau | AG |
| CHABG | Aarberg | BE |
| CHAAB | Aarburg | AG |
| CHAWG | Aarwangen | BE |