| City Name | County | Zip Code |
| Waldorf | Charles | ***** |
| Walkersville | Frederick | 21793 |
| Warfieldburg | Carroll | 21157 |
| Warwick | Cecil | 21912 |
| Washington Grove | Montgomery | 20880 |
| Waterloo | Howard | ***** |
| Watersville | Carroll | 21771 |
| Welcome | Charles | 20693 |
| Wenona | Somerset | 21870 |
| West Bethesda | Montgomery | ***** |
| West Denton | Caroline | 21629 |
| West Freindship | Howard | 21794 |
| West Hyattsville | Prince George's | ***** |
| West Nottingham | Cecil | 21917 |
| West Ocean City | Worcester | 21842 |
| West River | Anne Arundel | 20778 |
| Westernport | Allegany | ***** |
| Westminster | Carroll | 21157 |
| Westover | Somerset | 21871 |
| Weverton | Washington | ***** |
| Whaleyville | Worcester | 21872 |
| Wheaton | Montgomery | ***** |
| White Hall | Baltimore | ***** |
| White Marsh | Baltimore | 21162 |
| White Plains | Charles | 20695 |
| Whiteford | Harford | 21160 |
| Whitehaven | Wicomico | 21856 |
| Willards | Wicomico | 21874 |
| Williamsburg | Dorchester | 21643 |
| Williamsport | Washington | 21795 |
| Wingate | Dorchester | 21675 |
| Wittman | Talbot | 21676 |
| Woodbine | Carroll | 21797 |
| Woodensburg | Baltimore | 21136 |
| Woodland | Allegany | 21532 |
| Woodlawn | Baltimore | 21207 |
| Woodsboro | Frederick | 21798 |
| Woodstock | Howard | ***** |
| Woolford | Dorchester | 21677 |
| Worton | Kent | 21678 |
| Wye Mills | Talbot | 21679 |
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