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 Mendocino 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 Mendocino County, 2008

ZIP Code	Post Office Name	Zip Code Type	Enclosing ZIP Code
95410	Albion	NON-UNIQUE ZIP
95415	Boonville	NON-UNIQUE ZIP
95417	Branscomb	NON-UNIQUE ZIP
95418	Calpella	PO BOX ZIP	95482
95420	Caspar	NON-UNIQUE ZIP
95427	Comptche	NON-UNIQUE ZIP
95428	Covelo	NON-UNIQUE ZIP
95429	Dos Rios	NON-UNIQUE ZIP
95432	Elk	NON-UNIQUE ZIP
95437	Fort Bragg	NON-UNIQUE ZIP
95445	Gualala	NON-UNIQUE ZIP
95449	Hopland	NON-UNIQUE ZIP
95454	Laytonville	NON-UNIQUE ZIP
95456	Littleriver	NON-UNIQUE ZIP
95459	Manchester	NON-UNIQUE ZIP
95460	Mendocino	NON-UNIQUE ZIP
95463	Navarro	PO BOX ZIP	95466
95466	Philo	NON-UNIQUE ZIP
95468	Point Arena	NON-UNIQUE ZIP
95469	Potter Valley	NON-UNIQUE ZIP
95470	Redwood Valley	NON-UNIQUE ZIP
95481	Talmage	PO BOX ZIP	95482
95482	Ukiah	NON-UNIQUE ZIP
95488	Westport	NON-UNIQUE ZIP
95490	Willits	NON-UNIQUE ZIP
95494	Yorkville	NON-UNIQUE ZIP
95585	Leggett	NON-UNIQUE ZIP
95587	Piercy	NON-UNIQUE ZIP
95589	Whitethorn	NON-UNIQUE ZIP

Source: TeleAtlas

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