Lake County, CA ZIP Codes & Directory
Complete postal guide for Lake County, California. Featuring the official county seat of Lakeport, largest municipality Clearlake, and serving 12 incorporated municipal entities.
Municipalities Located in Lake County
Incorporated Cities, Towns, and Villages
Clearlake
cityZIPs: 95422
Clearlake Oaks
cityZIPs: 95423
Glenhaven
cityZIPs: 95443
Hidden Valley Lake
cityZIPs: 95467
Kelseyville
cityZIPs: 95451
Lakeport
cityZIPs: 95453
Lower Lake
cityZIPs: 95457
Lucerne
cityZIPs: 95458
Middletown
cityZIPs: 95461
Nice
cityZIPs: 95464
Upper Lake
cityZIPs: 95485
Witter Springs
cityZIPs: 95493
Active USPS ZIP Codes in Lake County
Standard delivery zones and geographic service boundaries
Frequently Asked Questions About Lake County, CA
What is the county seat and largest city in Lake County? ▾
The official county seat of Lake County is Lakeport, and its largest incorporated municipality by population is Clearlake.
How many cities, towns, and villages are in Lake County? ▾
Lake County encompasses 12 incorporated municipal entities, including 12 cities, 0 towns, and 0 villages.
What is the total population and land area of Lake County? ▾
According to official U.S. Census Bureau data, Lake County has a population of approximately 68,163 residents and spans an area of 1,256 square miles.
How many ZIP codes operate in Lake County? ▾
There are 12 active USPS ZIP codes serving addresses within Lake County, California.