ZIP codes are used by the US Postal Service to identify an area where mail is delivered. The use of the ZIP code in small area analyses is widespread despite its limitations. The limitations include foremost the non-homogeneity of the ZIP code unit with respect to geographical size and with respect to population size. For instance, California wide in the year 2000, the number of births in ZIP codes ranged from 0 to 2745 with a mean of 246 births and a standard deviation of 368 births.

The obvious advantage of using the ZIP code as the unit of analysis is its wide availability: ZIP code information can be easily collected compared to information on census block group. The wide availability of ZIP code level data allows the combining of ZIP code level information from different databases.

The table below lists all ZIP codes for San Francisco County that were included in the most recent list of available ZIP codes. The listing as well as the map coordinate files for the maps included in this report were based on data products that were obtained from the TeleAtlas company.

Among the USPS ZIP codes, not all have a physical service area. Point ZIP codes pertaining to a unique ZIP code (ZIP codes pertaining to a single site, building, organization) or P.O. Box cannot be associated with a physical area on a map. For the purposes of this report any counts in point ZIP are included in the counts for the enclosing ZIP. For each point ZIP, the enclosing ZIP is listed in the table below.

ZIP Inventory Table

ZIP Code Inventory for San Francisco County, 2008

ZIP Code	Post Office Name	Zip Code Type	Enclosing ZIP Code
94014	Daly City	NON-UNIQUE ZIP
94015	Daly City	NON-UNIQUE ZIP
94101	San Francisco	PO BOX ZIP	94102
94102	San Francisco	NON-UNIQUE ZIP
94103	San Francisco	NON-UNIQUE ZIP
94104	San Francisco	NON-UNIQUE ZIP
94105	San Francisco	NON-UNIQUE ZIP
94107	San Francisco	NON-UNIQUE ZIP
94108	San Francisco	NON-UNIQUE ZIP
94109	San Francisco	NON-UNIQUE ZIP
94110	San Francisco	NON-UNIQUE ZIP
94111	San Francisco	NON-UNIQUE ZIP
94112	San Francisco	NON-UNIQUE ZIP
94114	San Francisco	NON-UNIQUE ZIP
94115	San Francisco	NON-UNIQUE ZIP
94116	San Francisco	NON-UNIQUE ZIP
94117	San Francisco	NON-UNIQUE ZIP
94118	San Francisco	NON-UNIQUE ZIP
94119	San Francisco	PO BOX ZIP	94105
94120	San Francisco	PO BOX ZIP	94104
94121	San Francisco	NON-UNIQUE ZIP
94122	San Francisco	NON-UNIQUE ZIP
94123	San Francisco	NON-UNIQUE ZIP
94124	San Francisco	NON-UNIQUE ZIP
94125	San Francisco	PO BOX ZIP	94102
94126	San Francisco	PO BOX ZIP	94111
94127	San Francisco	NON-UNIQUE ZIP
94129	San Francisco	NON-UNIQUE ZIP
94130	San Francisco	NON-UNIQUE ZIP
94131	San Francisco	NON-UNIQUE ZIP
94132	San Francisco	NON-UNIQUE ZIP
94133	San Francisco	NON-UNIQUE ZIP
94134	San Francisco	NON-UNIQUE ZIP
94137	San Francisco	UNIQUE ZIP	94104
94139	San Francisco	UNIQUE ZIP	94104
94140	San Francisco	PO BOX ZIP	94109
94141	San Francisco	PO BOX ZIP	94103
94142	San Francisco	PO BOX ZIP	94103
94143	San Francisco	UNIQUE ZIP	94117
94144	San Francisco	UNIQUE ZIP	94118
94145	San Francisco	UNIQUE ZIP	94104
94146	San Francisco	PO BOX ZIP	94114
94147	San Francisco	PO BOX ZIP	94123
94151	San Francisco	UNIQUE ZIP	94105
94156	San Francisco	UNIQUE ZIP	94104
94158	San Francisco	NON-UNIQUE ZIP
94159	San Francisco	PO BOX ZIP	94118
94160	San Francisco	UNIQUE ZIP	94124
94161	San Francisco	UNIQUE ZIP	94111
94162	San Francisco	UNIQUE ZIP	94104
94163	San Francisco	UNIQUE ZIP	94104
94164	San Francisco	PO BOX ZIP	94109
94172	San Francisco	PO BOX ZIP	94122
94177	San Francisco	UNIQUE ZIP	94105
94188	San Francisco	PO BOX ZIP	94124
94199	San Francisco	UNIQUE ZIP	94105
94501	Alameda	NON-UNIQUE ZIP
94920	Belvedere Tiburon	NON-UNIQUE ZIP

Source: TeleAtlas

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