David Ryder / The New York TimesCanadians cheer on the Seattle Seahawks as they watch the NFC Championship game at the Kingston Taphouse & Grille in Vancouver, British Columbia.

VANCOUVER, British Columbia — During the NFC championship football game last Sunday, die-hard fans draped in navy blue and neon green, part of a group collectively known as the 12th Man, stood, yelled and chanted their Seattle Seahawks on to another victory, reaching excruciatingly high decibel levels in the process.

Only this did not happen in the stands of Seattle’s CenturyLink Field or inside a pub in the city’s Pioneer Square district.

This occurred three hours north of the stadium, straight up Interstate 5 and past the Canadian border, inside the Pint Public House in downtown Vancouver, where some 500 locals rooted on their Pacific Northwest neighbors.

Each time Seahawks quarterback Russell Wilson completed a pass, they high-fived and hugged. In the third quarter, after running back Marshawn Lynch eluded a pack of San Francisco 49ers defenders and broke free for a 40-yard touchdown, the Canadian contingent erupted, belting out Lynch’s nickname, “Beast Mode,” in unison.

“It’s like the Seahawks are the new Canucks here,” said James O’Byrne, the bar manager at The Pint, referring to Vancouver’s NHL team. “It’s been absolutely insane these past few weeks.”

Next Sunday, the Seahawks will face the Denver Broncos in Super Bowl XLVIII at MetLife Stadium in East Rutherford, N.J. If Seattle fails to contain Peyton Manning and the Broncos, it will not be for a lack of fan support.

Along with the team’s well-documented 12th Man fan group in their home state of Washington, the Seahawks have found similar allies north of the border.

To the outside sporting world, hockey-mad Vancouver is not considered a football city — despite being home of the Canadian Football League’s B.C. Lions. But with the Canucks having a subpar season, the opportunity to cheer for a championship contender has been welcomed by the locals.

“The Canadian following of the Seahawks and the NFL is becoming quite large,” said Alessandro Frijo, a 26-year-old Vancouver resident and Seahawks season-ticket holder. “Everybody here knows who Russell Wilson and Richard Sherman are.”

Seattle’s proximity to Vancouver and the similarities between hockey and football contribute to the interest.

“Both sports are physical, and I imagine that is part of the appeal for people here,” Frijo said. “I also think a lot of them go down to games in Seattle just for the experience.”

In the midst of Super Bowl season, footprints of Seahawks mania can be found everywhere around Vancouver. Any day of the week, fans in Seahawks gear are a common sight on the streets. Sporting goods stores, struggling to keep up with demand, feature Seattle merchandise in their window displays. At the Kingston Taphouse downtown, a blue 12th Man flag is perched atop the bar’s roof.

“What I think is unique about Seahawks fans, no matter what side of the border they live on, is the concept of the 12th Man and how emotionally invested people are in it,” said Omar Mawjee, the managing director for the Seahawks’ regional marketing office in Canada.

But Vancouver-area residents’ love affair with the Seahawks began long before this year’s Super Bowl run. Mawjee estimated that about 10 percent of the fans that had attended Seahawks home games in the past five seasons had come from Canada, mostly from Vancouver.

On social media, the Seahawks Canada Facebook page has more than 2,100 likes, and the Twitter page has more than 4,900 followers — a 1,600-follower increase since the start of the season. The fans have adopted the #12North hashtag, putting a customized touch to Vancouver’s Seahawks following.

Every summer, the Seahawks conduct what they call the 12 Tour, in which players do community outreach in those regions. The team also organized viewing parties around Vancouver for the NFC championship game and is planning to do the same for the Super Bowl.

Jon Moore, a 30-year-old Vancouver native, has been cheering on the Seahawks and attending games since the late 1980s, when the team played at the Kingdome.

“I’ve gone to hundreds of NHL games, but nothing compares to the feeling I get from attending a Seahawks game,” said Moore, a longtime season-ticket holder.

Moore is contemplating flying to New York to witness firsthand his team possibly win its first Super Bowl. He estimated that the last-minute trip would cost him about $6,000 (one upper-bowl ticket at MetLife Stadium is going for $2,000 alone).

He was in the stands at Ford Field in Detroit the last time the Seahawks made the Super Bowl, in 2006, when they lost to the Pittsburgh Steelers. But he is older now, he said, and money is tighter.

“I’ll either be booked for the trip of a lifetime, or making plans for a Super Bowl party with the family at home,” Moore said.

No matter where he watches the game, Moore has only goal in mind: “Either way, I hope we win.”