Geographical names which explain other names and dates which explain other dates:

Words in apposition:

[Note.]—When the parenthetical element occurs in the middle of a sentence, "set off by commas" means punctuate before and after.

[f.] Consecutive adjectives that modify the same noun are separated from each other by commas. If, however, the last adjective is closely linked in meaning with the noun, no comma is used before it.

[Note.]—The commas in a series of adjectives are used to separate the adjectives from each other. No comma should intervene between the final adjective and the noun. Wrong: He was only a frail, unarmed, frightened, youngster. Right: He was only a frail, unarmed, frightened youngster.

[g.] Words or phrases in series are separated by commas.