This tab is just from the Ultimate Guitar video, guitar lesson from Chad of State 
Radio.  It's just put down on paper so it is easier to follow.
Listen to the song for strumming, timing and for chord changes.
I tried to get the chords in the right place with the words but some are not even close.
ENJOY!

oh and the F# is like this 2-X-0-0-3-3

(INTRO)
G (320003@1)        Em (022000@1)name="chord_320003@1">G        C (x32010@1)    GCaught (320003@1)the sun down at Castle Island 
G (320003@1)                 DSummer (xx0232@1)spinning its finest gold 
G (320003@1)      Em (022000@1)name="chord_320003@1">G         C (x32010@1)     GThey (320003@1)were selling and we were buying 
G (320003@1)              DJust (xx0232@1)looking for someone to hold

(PRE-CHORUS)
GI (320003@1)know the feeling of the fight I never saw you blink 
G (320003@1)                               DWe (xx0232@1)been up against the crab apple sling shot sting 
G (320003@1)                CI (x32010@1)got my trash can lid on my wing 
G (320003@1)                      D (xx0232@1)         GWe're (320003@1)the Knights of the Round Table all

(VERSE)
G (320003@1)  Em (022000@1)G (320003@1)  C (x32010@1)    Em (022000@1)     D (xx0232@1) GI (320003@1)was working on the straight and narrow 
G (320003@1)                   DYou (xx0232@1)came at me like a cannonball 
G (320003@1)  Em (022000@1)G (320003@1) C (x32010@1)      Em (022000@1)  D (xx0232@1)  GI (320003@1)saw you sleeping at the city stables 
G (320003@1)                     DYou (xx0232@1)made me feel all of ten feet tall

(PRE-CHORUS)
GThe (320003@1)coming on coming for all the 
G (320003@1)                        DRules (xx0232@1)and the cops and the cold and all 
G (320003@1)              CAll (x32010@1)together and together we fall 
G (320003@1)                       D (xx0232@1)  GThrough (320003@1)the cracks in the city street 
G (320003@1)                       D (xx0232@1)  GThrough (320003@1)the cracks in the city street

(CHORUS)
G (320003@1)     
That's right sit straight 
DAnd (xx0232@1)listen up
           C (x32010@1)                G (320003@1)name="chord_244322@1">F# G (320003@1)name="chord_xx0232@1">D
We are the knights of Bostonia 
Em (022000@1)           C (x32010@1)                DWe'll (xx0232@1)tell the court you tell the king 
G (320003@1)                               DThat (xx0232@1)we ain't listening to you no more 
           C (x32010@1)               G (320003@1)name="chord_244322@1">F# G (320003@1)name="chord_xx0232@1">D
We are the knights of Bostonia 
Em (022000@1)         C (x32010@1)             DYou (xx0232@1)and Only you can set you free

(VERSE)
I would follow you out of the city 
Up Dot Ave to Savin Hill 
Dock man says the water gonna kill me 
Better that than sitting still

(PRE-CHORUS)
Coming on coming for all the 
Rules and the cops and the cold and all 
All together and together we fall 
Through the cracks in the city street 
Through the cracks in the city street

(CHORUS)
That's right sit straight 
And listen up 
We are the knights of Bostonia 
We'll tell the court you tell the king 
That we ain't listening to you no more 
We are the knights of Bostonia 
Only you can set you free

(AHHHH AHH AHH AHHHH PART)
Em (022000@1)    F# (244322@1)name="chord_320003@1">G       C (x32010@1)name="chord_320003@1">G       C (x32010@1)name="chord_320003@1">G       D (xx0232@1)(PRE-CHORUS)
I know the feeling of the fight I never saw you blink 
We been up against the crabapple sling shot sting 
I got my trash can lid on my wing 
We're the Knights of the Round Table all 
And we'll fight the coming fall

(CHORUS)
So sit straight 
And listen up 
We are the knights of Bostonia 
We'll tell the court to tell the king 
We ain't listening to you no more 
We are the knights of Bostonia 
Only you can set you free

(AHHHH AHH AHH AHHHH PART)
Em (022000@1)    F# (244322@1)name="chord_320003@1">G       C (x32010@1)name="chord_320003@1">G       C (x32010@1)name="chord_320003@1">G       D (xx0232@1)(OUTRO) for the rest just G D G C
G (320003@1)                           DRestless (xx0232@1)nights, the innocent street 
G (320003@1)                           CA (x32010@1)fist to fight, a summer to keep 
We are the knights of junkyard raid 
The trusty steed and a summer to save

We are the knights of all Bostonia 
Together we are the knights 
Of all Bostonia 
Together we are the knights 
Of all Bostonia 
Together we are the knights 
Of all Bostonia