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Hi, I'd greatly appreciate anyone's help.

What should I use for addressing to a woman in a cover letter when it does not tell us?
Ms, Mrs or Miss.

Dear madam/sir could be used if there was no name. However usually, there is a name e.g., Contact: Amanda Moore

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Comments  (Page 6) 
Its best in a cver letter if you do not know the title to ring the company and very politely ask the secretary who it is you should be addressing the letter to.. Remember to get absolute correct spelling as well.
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It's best in a cover letter, if you do not know the title, to ring the company and very politely ask the secretary who it is you should be addressing the letter to.. Remember to get the absolute correct spelling as well.

This is good advice, even if there is no secretary. If you ring my company, you will likely get me. However, I would see someone asking how to spell my name as a good thing. I would see them as someone who cares about being accurate.
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 BarbaraPA's reply was promoted to an answer.
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Ms fits both married or unmarried women. Miss is for women who women who are not married. Mrs is for married women

Ms.

My Dearest Sir/Madam:

Are you kidding me?!

Sincerely yours,

Ms. Atwood

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