The establishment of Negros Island Region (NIR) per Executive Order No. 183 signed by His Excellency Benigno S. Aquino III on May 29, 2015, brings the total number of regions in the country to 18. The NIR, which is composed of the provinces of Negros Occidental and Negros Oriental, shall be assigned the code 180000000 in the Philippine Standard Geographic Code (PSGC) following the last entry in the current series that is 170000000 for Region IV - B (MIMAROPA).
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