Several cars and a motorcycle followed behind the hearse carrying Alex's casket.
On his casket, messages including "I love you" and "Rest in peace" were written.
Soft toys and a toy truck were placed on top of the casket.
Some of Alex's family wore black, with ties in Alex's favourite colour, green.
A bright green two-door Dodge hot rod was among the cars driving in a procession down Durham St and into the Salvation Army car park.
Mourners were stoic and silent as Alex's parents and family escorted his casket into the building.
Horowhenua deputy mayor Garry Good said family members wore green because that was Alex's favourite colour.
He said people from search and rescue teams were also present.
"It was a very sad occasion as you can well imagine," Mr Good said.
He said Alex's mother read a poem which was of special significance to the family.
Mr Good said the Governor-General, Sir Jerry Mateparae, the country's Head Scout, sent a message "of sympathy and support" which was read aloud.
Ohau School principal Kathy Trevena-Brown also spoke at the funeral, Mr Good said.
Dozens of Scouts formed a guard of honour and a haka was performed as Alex's casket was carried out of the Worship and Community Centre.
Alex's casket left with a dozen or so cars following and one of his brothers riding Alex's small motorbike.
Mr Good said if there was any positive thing to emerge from the tragedy, it was the outpouring of community support.
Alex's family would need that support to continue, Mr Good said.
The family requested privacy as they mourned the loss of their youngest son.
"As you can imagine, we are devastated by the sudden loss of a beloved son, brother, grandson, uncle, nephew, cousin, classmate, friend, and fellow Scout," the family said in a statement last week.
A man arrested in connection with Alex's disappearance will reappear in Levin District Court tomorrow afternoon.
The man, in his 20s, appeared last week on one charge of illegally possessing a knife, and was granted interim name suppression.
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