[20][21] As the only NFL team based in the Pacific Northwest region of North America, the Seahawks attract support from a wide geographical area that includes parts of the U.S. states of Alaska, Idaho, Montana, Oregon, and Utah, as well as the Canadian province of British Columbia.

In addition, players Dave Brown, Jacob Green, Dave Krieg, Curt Warner, Jim Zorn, Matt Hasselbeck and Shaun Alexander have been inducted into the Seahawks Ring of Honor, along with head coaches Chuck Knox and Mike Holmgren, radio announcer Pete Gross, and franchise owner Paul Allen.

The expansion draft was held March 30–31, 1976, with Seattle and the Tampa Bay Buccaneers alternating picks for rounds selecting unprotected players from the other 26 teams in the league.

Finishing with a 9–7 record, the Seahawks made their first post-season appearance, defeating the Denver Broncos in the Wild Card Round, and then the Miami Dolphins, before losing in the AFC Championship to the eventual Super Bowl champion Los Angeles Raiders.

This realignment restored the AFC West to its initial post-merger roster of original AFL teams Denver, San Diego, Kansas City, and Oakland.

[54] They defeated the Washington Redskins in the Divisional Round and won the NFC Championship Game against the Carolina Panthers, but lost in Super Bowl XL against the Pittsburgh Steelers.

The highly touted Seattle defense gave up a go-ahead score late in the fourth quarter, and rookie quarterback Russell Wilson failed to throw the game-winning touchdown after multiple attempts in the red-zone.

[93][94][95][96] The 2017 iteration of the team missed the playoffs for the first time in six years, as injuries to their core players coupled with disappointing acquisitions of running back Eddie Lacy and kicker Blair Walsh failed them in a competitive NFC.

After defeating the Philadelphia Eagles 17–9 in the Wild Card game,[102] they lost to the Green Bay Packers in the Divisional round, failing another attempt at a second Super Bowl.

[110] Following the 2021 season was an offseason of continuing change, punctuated with the trade of quarterback Russell Wilson to the team he and the Seahawks beat in Super Bowl XLVIII, the Denver Broncos, on March 6, 2022.

Another hallmark franchise player from the Super Bowl-winning Seahawks, former All-Pro linebacker Bobby Wagner, was also cut by the team that same day, a move that saves them $16.6 million in cap space.

[118] When the Seahawks debuted in 1976, the team's logo was a stylized royal blue and forest green osprey's head based on Kwakwakaʼwakw art masks.

In 2000, Shaun Alexander's rookie year and Cortez Kennedy's last, the Seattle Seahawks celebrated their 25th Anniversary; the logo was worn on the upper left chest of the jersey.

On September 27, 2009, the Seahawks wore lime green jerseys for the first time, paired with new dark navy blue pants in a game against the Chicago Bears.

During a home matchup with the Vikings on December 3, 2019, the Seahawks wore their Color Rush green tops and regular navy pants.

[134][135] Following the Rams' return to Los Angeles in 2016, and subsequent playoff success (most recently with a Super Bowl victory in 2022); the rivalry has increased in intensity; especially as Seattle's Legion of Boom era teams waned in competition.

[137] Tensions especially ran high during the 2021 Wild Card game following a widely publicized taunt from Safety Jamal Adams during a postgame conference after a tough win over the Rams during week 16.

The Rams would go onto decimate the Seahawks in the wild card game, with cornerback Jalen Ramsey and quarterback Jared Goff expressing their satisfaction to get retribution following Adams' comments and cigar gesture.

Some notable moments include the clubs' first playoff meeting in 2003 in which Seahawks quarterback Matt Hasselbeck threw a game-losing pick-six in overtime after guaranteeing a game-winning drive,[142] the Fail Mary, and Russell Wilson overcoming four interceptions and a 16–0 Packers lead to lead Seattle to a 28–22 overtime win to advance to Super Bowl XLIX.

When the team's new headquarters across town in Kirkland was completed in 1986, the Seahawks held training camp at home for the next eleven seasons (1986–96), staying in the dormitories of the adjacent Northwest College.

The Seahawks would go on to defeat the reigning Super Bowl champion New Orleans Saints in the Wild Card round, becoming the first team ever to win a playoff game with a losing record.

[157] Note: Although Mike McCormack served as head coach, president, and general manager for the Seahawks, he is only listed in the Pro Football Hall of Fame for his contributions as a tackle for the New York Yanks and the Cleveland Browns.

[168] Opponents were known to practice with rock music blaring at full blast to prepare for the often painfully high decibel levels generated at games in the Kingdome.

[171] Current and former players, coaches, local celebrities, prominent fans including Patti Hammond, Seattle-area athletes, and former owner Paul Allen have raised the flag.

[177] Prior to the 2014 NFL season, Blitz was given a new look and a sidekick; a secondary mascot named Boom was introduced to appeal to and interact with younger children.

However, because of her relatively small size and an inability to be trained to lead the team out of the tunnel, Faith was replaced by an augur hawk named Taima before the start of the 2005 NFL season.

[180][181] A group of female and male cheerleaders known as the Seahawks Dancers rallies the crowd from the sidelines and performs a halftime routine during home games at Lumen Field.

The group was an all-female squad called the Sea Gals prior to admitting male members and re-branding ahead of the 2019 NFL season.

Other past announcers include Steve Thomas from 1992 to 1997, Lee Hamilton (also known as "Hacksaw") from 1998 to 1999, Brian Davis from 2000 to 2003, and former Seahawk Warren Moon from 2004 to 2017.

Preseason games not shown on national networks were produced in-house by Seahawks Broadcasting and televised by KING-TV, channel 5 (and, in 2008, also on sister station KONG-TV since KING, an NBC affiliate, was committed to the Summer Olympics in China).