Question

correct for commasI lived in San Francisco California for 20 years.

Accepted Answer

I lived in San Francisco, California, for 20 years.

# comma 1 separates city from state

# comma 2 separates required after state (unless written as CA in case there would be no comma)

I lived in San Francisco CA for 20 years.

Front	correct for commas I lived in San Francisco California for 20 years.
Back	I lived in San Francisco, California, for 20 years. # comma 1 separates city from state # comma 2 separates required after state (unless written as CA in case there would be no comma) I lived in San Francisco CA for 20 years.

I Lived San Years Francisco Comma Separates State