Koolwitje is een straat te Sneek in de gemeente Súdwest-Fryslân en is gelegen in de Nederlandse provincie Friesland.
| Postcode | Huisnummers |
|---|---|
| 8607 GV | 49, 51, 53, 47, 45, 43, 41, 39, 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, 15, 13, 11, 9, 7, 5, 3, 1, 55, 57, 59, 61, 63; |
| 8607 GW | 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 2, 4, 6, 8, 10, 12, 14, 16, 18, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48; |