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