Area Codes Netherlands The Area Codes of Netherlands: City/Town or Region Area code 1.Haarlem0232.Harderwijk03413.Harenkarspel02264.Heerenveen05135.Heerlen0456.Helmond04927.Hengelo0748.Hertogenbosch0739.Hillegom025210.Hilversum03511.Hoogeveen052812.Hoogezand059813.Hoorn022914.Hulst0114