Area Code 187 – Middelharnis
The phone area code for Middelharnis is 187 (international format +31187). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 187
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Middelharnis
Geographic Coverage and Administrative Jurisdiction
The +31 187 area code serves the western part of the province of South Holland (Zuid-Holland) in the Netherlands, specifically the region historically known as the island of Goeree-Overflakkee. This area is part of the municipality of Goeree-Overflakkee, which was formed in 2013 through the merger of the former municipalities of Dirksland, Goedereede, Middelharnis, and Oostflakkee. The principal town and administrative center for this code is Middelharnis, which is also the largest town on the island. The code covers all localities within the municipality, including Sommelsdijk, Stad aan 't Haringvliet, Oude-Tonge, and Stellendam.
Dialing Formats and Caller Instructions
For callers within the Netherlands, the national trunk prefix '0' is used before the area code. Thus, to call a number in Middelharnis from elsewhere in the country, you dial: 0187 followed by the local subscriber number, which is typically six digits in length. The complete national number is therefore 10 digits, including the leading '0'.
For international callers, the country code for the Netherlands is +31. The leading '0' of the national prefix is omitted. Therefore, an international call to a number in Middelharnis would be dialed as +31 187 followed by the six-digit local number. For example, a local number such as 612345 would be dialed as 0187 612345 domestically and as +31 187 612345 from abroad.
Overlay and Numbering Plan Considerations
As of the current ITU-T E.164 national numbering plan, there is no overlay code for the 187 area. The code is exclusively assigned to the geographic region of Goeree-Overflakkee. The Netherlands implemented a closed dialing plan in 1995, meaning that all national numbers, including those in Middelharnis, must be dialed in full, including the trunk prefix, even when calling from within the same area code. This ensures uniformity and simplifies call routing.
Service and Usage
Geographic numbers under the 187 code are used for fixed-line PSTN and VoIP services. They are typically associated with residential and business lines within the coverage area. Since the code is geographic, it is not portable outside the defined area, although number portability within the same geographic region is possible. Callers should be aware that charges for calls to 187 numbers are typically based on the caller's own tariff plan and the distance, though with modern flat-rate plans, distance often does not affect the cost.