| Riverhead Wildwood | Eastern Time | 00:00 |
| Riverhead Sheppard Air Force Base | Central Time | 01:00 |
| Riverhead Wayzata | Central Time | 01:00 |
| Riverhead Palos Heights | Central Time | 01:00 |
| Riverhead Wilkau-Haßlau | Central European Time | -06:00 |
| Riverhead South Jakarta | Western Indonesia Time | -11:00 |
| Riverhead Wavre | Central European Time | -06:00 |
| Riverhead Coacalco de Berriozabal | Central Time | 01:00 |
| Riverhead Williams | Mountain Time | 03:00 |
| Riverhead South Lancaster | Eastern Time | 00:00 |
| Riverhead Waverley | Eastern Australia Time | -14:00 |
| Riverhead Saint-Polycarpe | Eastern Time | 00:00 |
| Riverhead Williamsburg | Eastern Time | 00:00 |
| Riverhead South Lismore | Eastern Australia Time | -14:00 |
| Riverhead Waupaca | Central Time | 01:00 |
| Riverhead Clonakilty | Ireland Time | -05:00 |
| Riverhead Williamstown | Eastern Australia Time | -14:00 |
| Riverhead South Melbourne | Eastern Australia Time | -14:00 |
| Riverhead Wasserburg am Inn | Central European Time | -06:00 |
| Riverhead Saint-Pierre-du-Mont | Central European Time | -06:00 |
| Riverhead Wilbraham | Eastern Time | 00:00 |
| Riverhead South Miami | Eastern Time | 00:00 |
| Riverhead Waterford | Eastern Australia Time | -14:00 |
| Riverhead Clonmel | Ireland Time | -05:00 |
| Riverhead Wildau | Central European Time | -06:00 |
| Riverhead South Hill | Eastern Time | 00:00 |
| Riverhead Waterford Township | Eastern Time | 00:00 |
| Riverhead Saint-Pie | Eastern Time | 00:00 |
| Riverhead Wilder | Eastern Time | 00:00 |
| Riverhead South Hobart | Eastern Australia Time | -14:00 |
| Riverhead Waterloo | United Kingdom Time | -05:00 |
| Riverhead Clinton | Central Time | 01:00 |
| Riverhead Wilderswil | Central European Time | -06:00 |
| Riverhead South Kilvington | United Kingdom Time | -05:00 |
| Riverhead Washington | Eastern Time | 00:00 |
| Riverhead Saint-Rémy | Central European Time | -06:00 |
| Riverhead Wiesbaden | Central European Time | -06:00 |
| Riverhead South Kingstown | Eastern Time | 00:00 |
| Riverhead Washington | Eastern Time | 00:00 |
| Riverhead Clifton Hill | Eastern Australia Time | -14:00 |
| Riverhead Wieselburg | Central European Time | -06:00 |
| Riverhead South Kuta | Central Indonesia Time | -12:00 |
| Riverhead Wasilla | Alaska Time | 04:00 |
| Riverhead Saint-Rémy-de-Provence | Central European Time | -06:00 |
| Riverhead Villaines-la-Juhel | Central European Time | -06:00 |
| Riverhead Westkapelle | Central European Time | -06:00 |
| Riverhead Wasaga Beach | Eastern Time | 00:00 |
| Riverhead Clerques | Central European Time | -06:00 |
| Riverhead Villaga | Central European Time | -06:00 |
| Riverhead Westlake Village | Pacific Time | 03:00 |