18
- 01801 Woburn
- 01803 Burlington
- 01810 Andover
- 01821 Billerica
- 01824 Chelmsford
- 01826 Dracut
- 01827 Dunstable
- 01830 Haverhill
- 01832 Haverhill
- 01833 Georgetown
- 01834 Groveland
- 01835 Haverhill
- 01840 Lawrence
- 01841 Lawrence
- 01843 Lawrence
- 01844 Methuen
- 01845 North Andover
- 01850 Lowell
- 01851 Lowell
- 01852 Lowell
- 01854 Lowell
- 01860 Merrimac
- 01862 North Billerica
- 01863 North Chelmsford
- 01864 North Reading
- 01867 Reading
- 01876 Tewksbury
- 01879 Tyngsboro
- 01880 Wakefield
- 01886 Westford
- 01887 Wilmington
- 01890 Winchester