A Song of Ice and Fire Fanon Wiki:Regional strength

Below is the official military strength of each constituent region of the Seven Kingdoms in order of strongest to weakest. Strength is determined by how many soldiers and ships they can field. It does not take into account special advantages like dragons.

Regional strengths

 * 1) The Reach (100,000 fighting men & 200 ships)
 * 2) Westerlands (50,000 fighting men & 60 ships)
 * 3) The Vale of Arryn (45,000 fighting men)
 * 4) Dorne (45,000 fighting men)
 * 5) Riverlands (45,000 fighting men)
 * 6) The North (45,000 fighting men)
 * 7) Beyond the Wall (40,000 fighting men)
 * 8) Stormlands (30,000 fighting men)
 * 9) Iron Islands (20,000 fighting men & 100 ships)
 * 10) Crownlands (15,000 fighting men & 150 ships)
 * 11) Night's Watch (10,000 fighting men)

Collective strength

 * 1) Seven Kingdoms (395,000 fighting men & 510 ships)
 * 2) * Note: This estimate number excludes Dorne and the Night's Watch.
 * 3) Dorne (45,000 fighting men)
 * 4) Beyond the Wall (40,000 fighting men)
 * 5) Night's Watch (10,000 fighting men)

Source

 * Military strength at Westeros.Org