Addresses

Use the abbreviation Ave., Blvd. and St. only with a numbered address:

1600 Pennsylvania Ave.

Spell them out and capitalize when part of a formal street without a number:

Pennsylvania Avenue.

Lowercase and spell out when used alone or with more than one street name:

Massachusetts and Pennsylvania avenues.

All similar words (alley, drive, road, terrace, etc.) always are spelled out. Capitalize them when part of a formal name without a number; lowercase when used alone or with two or more names.

Always use figures for an address number:

9 Morningside Circle.

Spell out and capitalize First through Ninth when used as street names; use figures for 10th and above:

7 Fifth Ave., 100 21st St.

Use periods in the abbreviation P.O. for P.O. Box numbers.

Cities/states

Capitalize city if part of a proper name, an integral part of an official name or a regularly used nickname:

New York City, Kansas City, Windy City, City of Light.

Lowercase elsewhere:

a Texas city, the city government, the city Board of Education; and all other city of phrases: the city of Lexington.

Capitalize when part of a formal title before a name:

City Manager Lynn Smithson.

Lowercase when not part of a formal title:

city Health Commissioner Frank Smith

Use a comma after the city and after the state:

She was born in Lexington, Kentucky, in 1985.