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Commas With Letters and Numbers Study Guide (page 2)

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Updated on Sep 22, 2011

Tip

There are several exceptions to this comma rule:

Phone numbers 201-282-4337
Zip codes 35701
Years 1985
Serial numbers 7H927C378945
House numbers 18904 Wexler Street

However, when numbers are written in a series, commas should be placed between the items:

    Mary's children were born in 1989, 1991, 1995, and 1999.

A practice exercise for this concept can be found at Commas With Letters and Numbers Practice Exercise.

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