'Lassen' definitions:

Lassen -- U.S. County in California

From: Gazetteer 2000
Name :
Lassen -- U.S. County in California
Population (2000) :
33828
Housing Units (2000) :
12000
Land area (2000) :
4557.267297 sq. miles (11803.267612 sq. km)
Water area (2000) :
163.104659 sq. miles (422.439110 sq. km)
Total area (2000) :
4720.371956 sq. miles (12225.706722 sq. km)
Located within :
California (CA), FIPS 06
Location :
40.612365 N, 120.720234 W