ZIP codes in Middlesex County
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- 01431 AshbyMiddlesex County
- 01432 AyerMiddlesex County
- 01450 GrotonMiddlesex County
- 01460 LittletonMiddlesex County
- 01463 PepperellMiddlesex County
- 01464 ShirleyMiddlesex County
- 01469 TownsendMiddlesex County
- 01474 TownsendMiddlesex County
- 01701 FraminghamMiddlesex County
- 01702 FraminghamMiddlesex County
- 01718 ActonMiddlesex County
- 01719 ActonMiddlesex County
- 01720 ActonMiddlesex County
- 01721 AshlandMiddlesex County
- 01730 BedfordMiddlesex County
- 01731 BurlingtonMiddlesex County
- 01741 CarlisleMiddlesex County
- 01742 ConcordMiddlesex County
- 01746 HollistonMiddlesex County
- 01748 HopkintonMiddlesex County
- 01749 HudsonMiddlesex County
- 01752 MarlboroughMiddlesex County
- 01754 MaynardMiddlesex County
- 01760 FraminghamMiddlesex County
- 01770 SherbornMiddlesex County
- 01773 LincolnMiddlesex County
- 01775 StowMiddlesex County
- 01776 SudburyMiddlesex County
- 01778 WaylandMiddlesex County
- 01801 WoburnMiddlesex County
- 01803 BurlingtonMiddlesex County
- 01821 BillericaMiddlesex County
- 01824 BillericaMiddlesex County
- 01826 DracutMiddlesex County
- 01827 DunstableMiddlesex County
- 01850 LowellMiddlesex County
- 01851 LowellMiddlesex County
- 01852 LowellMiddlesex County
- 01854 LowellMiddlesex County
- 01862 BillericaMiddlesex County
- 01863 North ChelmsfordMiddlesex County
- 01864 North ReadingMiddlesex County
- 01867 ReadingMiddlesex County
- 01876 TewksburyMiddlesex County
- 01879 TyngsboroMiddlesex County
- 01880 WakefieldMiddlesex County
- 01886 WestfordMiddlesex County
- 01887 WilmingtonMiddlesex County
- 01890 WinchesterMiddlesex County
- 02138 CambridgeMiddlesex County
- 02139 CambridgeMiddlesex County
- 02140 CambridgeMiddlesex County
- 02141 CambridgeMiddlesex County
- 02142 CambridgeMiddlesex County
- 02143 SomervilleMiddlesex County
- 02144 SomervilleMiddlesex County
- 02145 SomervilleMiddlesex County
- 02148 MaldenMiddlesex County
- 02149 EverettMiddlesex County
- 02155 MedfordMiddlesex County
- 02176 MelroseMiddlesex County
- 02180 StonehamMiddlesex County
- 02420 LexingtonMiddlesex County
- 02421 LexingtonMiddlesex County
- 02451 WalthamMiddlesex County
- 02452 WalthamMiddlesex County
- 02453 WalthamMiddlesex County
- 02458 NewtonMiddlesex County
- 02459 NewtonMiddlesex County
- 02460 NewtonMiddlesex County
- 02461 NewtonMiddlesex County
- 02462 NewtonMiddlesex County
- 02464 NewtonMiddlesex County
- 02465 NewtonMiddlesex County
- 02466 NewtonMiddlesex County
- 02468 NewtonMiddlesex County
- 02472 WatertownMiddlesex County
- 02474 ArlingtonMiddlesex County
- 02476 ArlingtonMiddlesex County
- 02478 BelmontMiddlesex County
- 02493 WestonMiddlesex County