West played detective Jimmy McNulty in all five seasons, anchoring the series' investigation side while the focus widened around him.

The English actor later led The Affair and portrayed Prince Charles in The Crown. His public career also includes theater, Les Misérables, Colette, and the historical drama SAS: Rogue Heroes.

Elba's Russell Bell, known as Stringer, became one of the drama's defining strategic figures during its first three seasons.

He later led Luther, earned wide film recognition through Beasts of No Nation and Mandela: Long Walk to Freedom, joined major franchises, and returned to serial television as the star and executive producer of Hijack.

Pierce portrayed homicide detective William Moreland, called Bunk, across the full run. He then stayed closely associated with ambitious ensemble television through Treme, Suits, Jack Ryan, and Elsbeth.

Stage work has been equally important: his Broadway performance as Willy Loman in Death of a Salesman received a Tony nomination.

Sohn played detective Shakima Greggs throughout the series and helped connect its investigative workplace to the costs felt at home.

She later acted in Body of Proof, The Originals, Star Trek: Discovery, and The Chi. She also directed Baltimore Rising and The Slow Hustle, documentaries examining public institutions in Baltimore.

Reddick played Cedric Daniels in all five seasons, charting the pressures placed on a police commander by competing institutions.

He later became a major presence in Fringe, Bosch, the John Wick films, and game voice performance. Reddick died in 2023; later releases and completed voice work form part of his public legacy.

Peters's Lester Freamon combined patient craft with investigative focus across the series.

A veteran stage performer before The Wire, Peters later reunited with David Simon's television world in Treme and appeared in Da 5 Bloods, His Dark Materials, The Man Who Fell to Earth, and Foundation. Writing and musical theater also remain part of his résumé.

Royo appeared through all five seasons as Reginald Cousins, known as Bubbles, giving the series one of its longest and most humane personal arcs.

Later roles include Empire, Hand of God, Truth Be Told, and With Love. His continued character work spans music-industry drama, legal mystery, comedy, and independent film.

Williams portrayed Omar Little from season 1 through season 5, creating a character whose code and independence complicated every institutional category around him.

He later starred in Boardwalk Empire, The Night Of, When They See Us, and Lovecraft Country. Williams died in 2021, leaving an acclaimed body of dramatic and documentary work.

Harris played Avon Barksdale as a central figure in seasons 1 through 3 and returned later, embodying a different approach to power from Stringer.

He had already led the sports drama Remember the Titans. Later work includes the Creed films, Blade Runner 2049, Empire, Winning Time, and Shooting Stars.

Gillen joined in season 3 as councilman Tommy Carcetti and remained through season 5, bringing municipal politics into the series' structural argument.

Before and after that work, he built a distinctive television résumé through Queer as Folk, Game of Thrones, Peaky Blinders, Project Blue Book, and the Irish crime drama Kin.

Hector entered in season 3 as Marlo Stanfield and became central to the show's changing account of street power.

He later played detective Jerry Edgar across Bosch and returned to a Baltimore-set institutional drama in We Own This City. Additional credits include Queen of the South and The Strain, alongside arts-education work.

Gilliam played Ellis Carver throughout all five seasons, with the character developing from a careless narcotics officer into a more reflective supervisor.

Gilliam later became Father Gabriel on The Walking Dead and appeared in Teen Wolf and City on a Hill. His career also includes stage performances and directing television episodes.

Lombardozzi's Thomas Hauk, known as Herc, appeared in every season while shifting among police and private investigative work.

The Bronx-born character actor later appeared in Boardwalk Empire, The Irishman, The King of Staten Island, Reacher, Tulsa King, and Reptile. His public credits repeatedly use blunt authority while changing its context.

Lovejoy played prosecutor Rhonda Pearlman across the full series, linking case-building to the courts and city politics.

She later appeared in The Blacklist, American Gothic, Raising Dion, and Big Dogs, while continuing theater work. Her roles often turn on professional precision, but the institutions and ethical pressures differ markedly.

Akinnagbe joined in season 3 as Chris Partlow and remained through the finale. Later screen work includes The Good Wife, The Deuce, The Old Man, and Power Book II: Ghost.

He has also published journalism, produced projects, and performed onstage, building a public career broader than the controlled menace of his Wire role.