Sports-team fandom doesn't necessarily depend on geography.
I've been a Seahawks fan since 1976, and I didn't have any connection at all to the PNW. I never even visited Seattle (or any place closer to it than Lake Tahoe) until 2019. I grew up in Maine, then lived in Chicago and then three cities in California before moving to Brazil. In my case, I was seven, I saw some uniforms I didn't recognize on TV and asked my dad who that team was, and then adopted that team as mine on the spot. It seems like a shaky basis for choosing a team, but even though I let peer pressure get to me in many aspects of my life as a kid and especially as an adolescent, I stuck with the Seahawks despite being the only Seahawks fan I knew. I think it helped that my dad thought it was cool that I had chosen my first favorite sports team, and he supported me being a Seahawks fan a lot over the years.
My parents grew up in northern New Jersey, close to NYC and pretty damn close to where the Giants and Jets play now. My dad was from Rutherford. Giants Stadium (1976-2009) was in East Rutherford, and its replacement, MetLife Stadium, the current home of both the Giants and Jets, is also in East Rutherford.
I don't think my dad had a single favorite NFL team. There were teams he liked (the Dolphins, Noll Steelers, Giants, and Walsh 49ers, for example) and disliked (Raiders, Cowboys, and Elway Broncos), but I don't think he was a fan of any one team. When my dad was a kid, he was a Brooklyn Dodgers fan, but his younger brother was a New York (baseball) Giants fan.
I grew up in Maine, but I was never a Patriots fan. I knew a lot about the Patriots because they were on TV and in the newspaper all the damn time, plus the kids playing football in the neighborhood with me were all Patriots fans, as were just about all my classmates at school who were into football, so when I was involved in conversations about football, Patriots players and games were just about always part of it. When we were playing, we would call a long pass as "Grogan to Francis," referring to the Patriots' QB and Pro Bowl (and second-team All-Pro) tight end. The kid who taught me how to play football was the town police chief's youngest son Chuck, who was about three years older than I was. Through him, I knew all about "Hog" Hannah, Sam Adams, Julius Adams, Leon Gray (Chuck really liked the guys in the trenches), "Sam Bam Cunningham," Grogan, Francis, Darryl Stingley, Mike Haynes, Stanley Morgan, etc.
Here in Brazil, there are pro soccer teams in the northeast, including a few that are in the top league, but I think that in northeastern Brazil, there are more fans of Flamengo, a team from Rio, than there are fans of any one of the teams from the region.