ZIP Codes ...
While some people have used a ZIP code to identify a community, the purpose of the ZIP code was to make mail delivery more efficient by grouping addresses together. Although the ZIP Code doesn't specifically identify a community like Guerneville, it does identify addresses that are in (or near) Guerneville. It's important to remember that the boundaries of a ZIP Code are defined by the needs of the USPS and can be changed, re-assigned or overlapped with other ZIP Codes.
The ZIP code for Guerneville: 95446<1>
Referenced GNIS Records ...
GNIS ID #277527 (Name of Record: Guerneville)
Class: populated place
A place or area having clustered or scattered buildings and a permanent population (such as a city, settlement, town or village). The boundaries may or may not coincide with the perceived population.
A 'populated place' record may have a corresponding 'census' or 'civil' record. The information contained in the 'populated place' record applies only to the class and should not be confused with either the 'census' and 'civil' classes.
Map Name: Guerneville
Lat: 38.5018575 Lon: -122.9961102 [Map]
Elev: 18 ft.
Referenced FIPS Records ...
FIPS Code: 06/31470 (Place Name: Guerneville)
County: Sonoma (FIPS State/County: 06/097)
GSA Code: 1518
MRF Code: 1183
MSA Code: 7500