01604 area code telephone
Northampton area code. UK area code 01604 is for Northampton and the surrounding area. Locations using 01604 numbers include: 1  Blisworth. 2  Brixworth.3  Chapel Brampton. 4  Cogenhoe. 5  Creaton. 6  Duston.7  Earls Barton.orthampton area code. UK area code 01604 is for Northampton and the surrounding area. Locations using 01604 numbers include: 1  Blisworth. 2  Brixworth.