Verified answer

The bands you listed aren't really indie. Here are some similar bands:

AFI

The Red Jumpsuit Apparatus

Senses Fail

Hawthorne Heights

Madina Lake

Fall Out Boy

Aiden

30 Seconds To Mars

Brand New

Motion City Soundtrack

Yellowcard

Hoobastank

The All-American Rejects

Cartel

The Used

Jimmy Eat World

Lostprophets

This Providence

Kill Hannah

Boys Like Girls

Here are some indie bands:

Modest Mouse

Army Of Anyone

The Format

The Forecast

Cold War Kids

Silversun Pickups

Peter, Bjorn & John

The Postal Service

The Kooks

Kaiser Chiefs

Placebo

The Raconteurs

Bloc Party

Bright Eyes

The Shins

TV On The Radio

Rilo Kiley

Neko Case

Satrs of Track and Field

The Arcade Fire

Arctic Monkeys

Astra Heights

The Cat Empire

Cliks

Mutemath

Mink

The Fratellis

Silversun Pickups

Polyphonic Spree

Fiction Plane

The Automatic Automatic

The Cat Empire

Urgency

Tragically Hip

Paranoid Social Club

There's no real best answer to this, but a lot of the other answers list emo and brit-pop bands signed to major labels that I wouldn't consider indie rock.

Indie just means released on independant label (just like emo just means emotional) but people have differing views of what constitutes "indie rock" as a genre. Myself personally, I'm more into mellow kinda stuff that's reminiscent of the Beatles and other 60s psychedelia, except with a nuvo edge.

Some brit-pop bands like Travis and Coldplay and Badly Drawn Boy might classify, but even if they don't, they're great!

Good indie female-vocalist bands out there include Camera Obscura, The Poems, and Let's Go Sailing.

Cool trippy stuff includes Grizzly Bear, Animal Collective, Brian Jonestown Massacre maybe...

There's the Brian Wilson-ish stuff like The Shins. The Dandy Warhols were cool through their first couple albums.

Oh, and Belle and Sebastian are totally definitive indie rock! Their whole catalogue is tremendous, and between their releases and ep's, they have tons of material- great lyrics and great songwriting!

Also check The Coral, Youth Group, Wilco, and Of Montreal.

The bands you listed are not usually associated with "Indie rock" more alternative rock.

These bands are a better fit:

Sigur Rós

The Stone Roses

Sonic Youth

Pavement

Guided by Voices

Belle & Sebastian

Broken Social Scene

Brightblack Morning Light

Fugazi

Wilco

You don't get more indie than Pavement/Steven Malkmus.

Others:

the Shins

Iron and Wine

Calexico

Built To Spill / Doug Martsch

Band of Horses

Grandaddy

Yo La Tengo

Sonic Youth (whether they are literally indie could be questioned, but the sound is there)

Sufjan Stevens

Nick Drake

the Silver Jews

Guided By Voices

Robert Pollard w/ Doug Gillard

Old 97s

Wilco

Loose Fur

Broken Social Scene

Feist

that should get you started

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I was just reading down and how could I forget Belle and Sebastian. There really is just too much good stuff to keep track of.

The guy below, whose name I can't remember (aside from making me realize that I forgot Belle and Sebastian) did also raise the great point about the genre and the actual music that is released on non major labels. I was speaking to the indie rock genre.

For indie: Man or Astro Man, Superchunk, The Automatic Automatic, Circa Survive, Daphne Loves Derby, Bloc Party

that list of 'indie' bands you produced is really, really bad.

if you mean indie as in 'not on a major label' then here are some 'indie' bands from my top artists on last fm:

Elliott Smith, Emmy the Great, The Elected, Bright Eyes, Jenny Lewis, Feist, Emily Haines, Tilly and the Wall, Kid Harpoon, Portugal. the Man, Of Montreal, Cat Power, Au Revoir Simone, Kevin Devine, Iron and Wine, Devendra Banhart, Orenda Fink, Two Gallants, The Mountain Goats, Andrew Bird

I could carry on but thats enough.

some people could really do with finding out what indie music is - u seriously don't think Gym Class Heroes, Plain White T's, Panic! At the Disco, ACDC, Nirvana, Guns'n'roses etc r indie surely?!

see I'd like to reccomend bands like vapnet and cats on fire and jens lekman but i dont know what id do if the legions of panic! fans suddenly latched onto my favorite music and strangulated the life out of that instead of the now forsaken "emo scene" (although how anything so un-hardcore could be called emo is beyond me). I feel bad for the old Rites of Spring fans.

arctic monkeys

modest mouse

hot hot heat

head automatic

the automatic automatic

boys like girls

third eye blind

rooney

mates of state

feist

klaxons

the kooks

the secret machines

great northern

sufjan stevens

thats about all i can think of that u havent listed but im sure there's more.

oh and btw HIGH FIVE ON THE YEAH YEAH YEAHS! they own!! well good luck!