Kaipara ki Mahurangi is an electorate created for the 2020 election. The electorate was created after rapid population growth in the former Rodney electorate caused the northern section to be carved off and incorporated into Helensville, which in turn lost the Waitakere Ranges to New Lynn and an area around Coatesville and Dairy Flat to Whangaparāoa (the former Rodney). In the 2025 boundary review the Kaipara ki Mahurangi electorate expanded into a small area south of Coatesville, which moved from Whangaparāoa.