This rule applies to addresses within body copy, not addresses for mailing purposes. When writing out addresses, abbreviate north, south, east, and west when used with a street name and number. Abbreviate avenue, street, and boulevard with a street name and number; spell out similar words such as alley, road, drive, terrace, etc.
When referring to states, write out the name when it stands alone in a sentence, but use the AP abbreviation when the state is coupled with a city. States that are never abbreviated: Alaska, Hawaii, Idaho, Iowa, Maine, Ohio, Texas, Utah. Use Washington, D.C. Don’t abbreviate to D.C. or, DC.
State abbreviations are:
Ala., Ariz., Ark., Calif., Colo., Conn., Del., Fla., Ga., Ill., Ind., Kan., Ky., La., Md., Mass., Mich., Miss., Mo., Mont., Neb., Nev., N.H., N.J., N.M., N.Y., N.C., N.D., Okla., Ore., Pa., R.I., S.C., S.D., Tenn., Vt., Va., Wash., W. Va., Wis., Wyo.