What is the proper form for addressing a letter to a Member of Congress?

Continental army addressed to her a letter that attracted much attention, being published in the magazines of the day.

Some leading London agencies throw away all incorrectly addressed letters without reading them.

But you would use more of his name in addressing a letter to him; courtesy would require this.

They were lovers, and he addressed both poems and letters to her.

In 1788 he addressed a letter to William Pitt on the subject of a new dictionary.

On February 6, 1941, he addressed a long letter to the Spanish dictator.

On this occasion Uthman is reported to have addressed a letter to the invading force.

She couldn't fathom why such a man would address a letter to her as if she were an unmarried lady.

"I suggest you allow Anatoly to address a letter to Diana, to ask her."