His plan foreshadowed the day when population growth could justify dividing Tauranga into two electorates - Tauranga East and Tauranga West. The rest of the Western Bay of Plenty would become a third electorate.
Mr Baldock said Arataki's population of 5160 would offset Pyes Pa's population of 6036 without breaching the Bay of Plenty Electorate's quota cap.
His submission highlighted the electorate's creep into the Papamoa and eastern boundaries of Tauranga until it wrapped around the city by taking in Te Puna and Omokoroa.
Mr Baldock compared Tauranga to the similar-sized urban and rural areas of Hamilton and Dunedin that were divided into two electorates - Dunedin North and Dunedin South, and Hamilton East and Hamilton West.
A Tauranga East electorate would provide a community of interest for those living on the coastal margins, while Tauranga West would take in voters living around Tauranga Harbour. If there was any merit in shifting boundaries, then including Arataki in the Bay of Plenty made more sense than disrupting the residents of Pyes Pa, he said.
With a combined Tauranga City and Western Bay District population of nearly 160,000 the sub-region was coming close to the 170,000 to 180,000 needed to justify three electorates.
Objections to the proposed boundary changes will be published mid January so the public can make counter submissions, with hearings scheduled for mid February.
Mr Baldock is a Pyes Pa resident and member of the Conservative Party. He served as a List MP for the United Future Party.