"It's a solid result for me and the National Party," he said.
Guy had partly campaigned on a raft of improvements to local social services, which he said needed to continue in Kapiti and Horowhenua.
His first focus would be on "ensuring a decent road through Horowhenua," followed by the ultra-fast broadband rollout.
Rob McCann told media he had given the election campaign his all, but it had just not been enough.
"Turns out there aren't quite enough of us on the Kapiti Coast and in Horowhenua," he said. There was a large gap between his result and the next candidate, the Green's Sam Ferguson, who won 1712 votes.
New Zealand First's Romuald Rudzki got 1508 votes, while Horowhenua District councillor Piri-Hira Tukapua for The Opportunities Party (TOP) came in at 876 votes. Independent candidate Sam Jennings received 458 votes, while ACT's Wayne Grattan received 91.
The pros and cons:
Mr Guy, who is number 12 on the National Party list, is the Minister for Primary Industries, Racing and Associate Minister for Economic Development.
He has associated himself strongly with construction of the new Kapiti Expressway, and funding for local projects Te Awahou Nieuwe Stroom cultural centre in Foxton and the $4 million grant, which the government announced in August, ahead of the general election, to help clean up Horowhenua's notoriously polluted waterways.
He was also embroiled in some controversial moments during his last terms, including voting against the Same Sex Marriage Bill, and saying Horowhenua's waterways were in "fairly good shape," despite the district having the second most polluted stream and one of the most polluted lakes in the country.
He also signed off on US businessman Peter Thiel's New Zealand citizenship in 2011, despite the controversial billionaire having spent only 12 days in the country.
Mr Guy has family roots in Horowhenua. From a farming background, he was raised around local politics, his late father Malcolm Guy serving on the local council and as district mayor for many years.
Mr Guy also served on the Horowhenua District Council himself. However, he has also been criticised by opponents for being too removed from the realities of many people's life on the poverty line, having recently declared one of the largest property portfolios of all MPs in the country, with farmland, a family home, two rental properties and an upmarket Wellington house, as well as interests in 13 commercial properties.
By the numbers: party votes:
In the Otaki electorate, National won 17,317 of all party votes cast, with Labour on 12,937, NZ First on 3080, Green on 1943, TOP on 746 and ACT on 141.
There were also 119 votes cast for the Maori Party, 67 votes for the Aotearoa Legalise Cannabis Party, 59 for the Conservative Party, 37 for Ban1080, 23 for New Zealand People's Party, 20 for United Future, 15 for MANA, 7 for Democrats for Social Credit and 3 votes for the Internet Party.
Note: Shannon, while in the Horowhenua, falls outside of the Otaki electorate and is under Rangitikei, which was won by National's Ian McKelvie, with 18,807 votes, beating Labour's Heather Warren with a margin of 9664.