Lassen County, CA ZIP Codes & Directory
Complete postal guide for Lassen County, California. Featuring the official county seat of Susanville, largest municipality Susanville, and serving 10 incorporated municipal entities.
Municipalities Located in Lassen County
Incorporated Cities, Towns, and Villages
Doyle
cityZIPs: 96109
Janesville
cityZIPs: 96114
Litchfield
cityZIPs: 96117
Milford
cityZIPs: 96121
Ravendale
cityZIPs: 96123
Standish
cityZIPs: 96128
Susanville
cityZIPs: 96130
Termo
cityZIPs: 96132
Wendel
cityZIPs: 96136
Westwood
cityZIPs: 96137
Active USPS ZIP Codes in Lassen County
Standard delivery zones and geographic service boundaries
Frequently Asked Questions About Lassen County, CA
What is the county seat and largest city in Lassen County? ▾
The official county seat of Lassen County is Susanville, and its largest incorporated municipality by population is Susanville.
How many cities, towns, and villages are in Lassen County? ▾
Lassen County encompasses 10 incorporated municipal entities, including 10 cities, 0 towns, and 0 villages.
What is the total population and land area of Lassen County? ▾
According to official U.S. Census Bureau data, Lassen County has a population of approximately 32,730 residents and spans an area of 4,541 square miles.
How many ZIP codes operate in Lassen County? ▾
There are 10 active USPS ZIP codes serving addresses within Lassen County, California.