Addresses

Use numerals for buildings and house numbers.
                    1600 Pennsylvania Ave.

Use abbreviations for Avenue (Ave.), Boulevard (Blvd.), and Street (St.), with numbered addresses.
                    1600 Pennsylvania Ave.

                    1600 Pennsylvania Blvd.

                    1600 Pennsylvania St.  

Spell out when not used with a number:
                    Pennsylvania Avenue

Spell out and lowercase the first letter of avenues, boulevards, and streets when used with two or more street names.
                    Parkland and Hannity streets are in Chicago.

Certain road designations are usually spelled out in AP Style.
                    Drive          Road          Lane          Terrace    Circle

In other stylebooks, however, abbreviations are often used: Dr., Rd., Ln., Ter., Cir.

Some stylebooks prefer no periods for PO Box;  AP Style prefers periods, P.O. Box.

Generally, spell out and capitalize numbers first to ninth; use numerals for 10th and above.

    First Street                11th  Avenue  

The New York Times Company                                     Ballard Inc.
620 Eighth Ave.                                                              830 25th St.
New York, NY 10018                                                      Los Angeles, CA 90210