Separate a city from a state, province, region or country with a comma.

Small_OK Chicago, Illinois
Small_OK Lisbon, Portugal

Do not use a comma between the month and the year.

Cross October, 2001
Small_OK October 2001

In most numbers of one thousand or more, use commas between groups of three digits, counting from the right.

Small_OK 62,242
Small_OK 1,723
Small_OK 1,000,000

Exceptions are degree temperatures, year numbers of four digits, addresses, page numbers and other uses of numbers for a non-quantifying purpose (see the subsection “Numbers and commas” in Numbers and punctuation).

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