Robert Aurand Moon (April 15, 1917, Pennsylvania, USA—April 11, 2001, Florida, USA), sometimes called 'Mr. Zip', is considered the father of the ZIP Code or Zone Improvement Plan, a mechanism to route mail in the United States. He developed the idea in the 1940s while working as a postal inspector in Philadelphia, although his system used only the first three digits of what would become a five-digit system. The first Directory of Post Offices using five-digit zip code numbers was published in 1963. is the 105th day of the year (106th in leap years) in the Gregorian calendar. ... 1917 (MCMXVII) was a common year starting on Monday of the Gregorian calendar (see link for calendar) or a common year starting on Tuesday of the 13-day slower Julian calendar (see: 1917 Julian calendar). ... Capital Harrisburg Largest city Philadelphia Area  Ranked 33rd  - Total 46,055 sq mi (119,283 km²)  - Width 280 miles (455 km)  - Length 160 miles (255 km)  - % water 2. ... is the 101st day of the year (102nd in leap years) in the Gregorian calendar. ... Year 2001 (MMI) was a common year starting on Monday (link displays the 2001 Gregorian calendar). ... Official language(s) English Capital Tallahassee Largest city Jacksonville Largest metro area Miami Area  Ranked 22nd  - Total 65,795[1] sq mi (170,304[1] km²)  - Width 361 miles (582 km)  - Length 447 miles (721 km)  - % water 17. ... Mr. ... The United States Postal Inspection Service or USPIS is the law enforcement arm of the United States Postal Service. ... Nickname: City of Brotherly Love, Philly, the Quaker City Motto: Philadelphia maneto (Let brotherly love continue) Location in Pennsylvania Coordinates: Country United States State Pennsylvania County Philadelphia Founded October 27, 1682 Incorporated October 25, 1701 Mayor John F. Street (D) Area    - City 369. ...