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To: elmatador who wrote (46673)	2/25/2004 7:22:26 PM
From: RealMuLan	Respond to of 74559

basically, zip+4 can go down to the Census block group, or even individual buildings. The following is from USPS "In 1983, the Postal Service began using an expanded ZIP Code called "ZIP+4." A ZIP+4 Code consists of the original 5-digit ZIP Code plus a 4-digit add-on code. The 4-digit add-on number identifies a geographic segment within the 5-digit delivery area, such as a city block, office building, individual high-volume receiver of mail, or any other unit that would aid efficient mail sorting and delivery. " usps.com