California

Colusa County

Colusa County has an estimated 21,836 residents as of 2025 across 2 incorporated places, a decline of 0.1% since 2020.

Population (2025)
21,836
Census Bureau estimate
Change since 2020
-0.1%
Resident population
Incorporated places
2
Cities, towns and CDPs
Unincorporated share
45%
Residents outside city limits

Industries in Colusa County

91 establishments indexed

Establishment and employment counts from the U.S. Census Bureau County Business Patterns program.

IndustryNAICSEstablishmentsEmployees
HVAC & Plumbing238220417
Electrical238210411
Roofing238160n/an/a
Landscaping561730n/an/a
Pest Control561710n/an/a
Pool Service561790n/an/a
Commercial Cleaning561720434
Flooring238330n/an/a
Glass & Glazing238150n/an/a
Septic & Well23891033
Auto Repair811111612
Auto Body811121n/an/a
Car Wash811192n/an/a
Towing488410n/an/a
Trucking484110, 4841212338
Equipment Rental532412n/an/a
Dental621210637
Veterinary541940n/an/a
Home Health621610n/an/a
Pharmacy446110435
Medical Practice621111632
Optometry621320n/an/a
Accounting541211, 541213n/an/a
Insurance Agency524210617
IT & MSP541513, 541512n/an/a
Staffing561320, 561311n/an/a
Engineering541330n/an/a
Architecture541310n/an/a
Law Firm541110614
Security Services561612n/an/a
Printing323111n/an/a
Sign Shops339950n/an/a
Machine Shops332710n/an/a
Metal Fabrication332322, 332312n/an/a
Plastics326199n/an/a
Food Manufacturing311999, 311812n/an/a
Millwork337110, 321918n/an/a
Restaurants72251114219
Bakeries311811n/an/a
Liquor Stores445310n/an/a
Gyms & Fitness713940n/an/a
Salons & Spas812112, 812113, 812199n/an/a
Laundromats812310n/an/a
Dry Cleaning812320n/an/a
Funeral Homes812210n/an/a
Self Storage531130n/an/a
Childcare624410510
Pet Services812910n/an/a

Cities in Colusa County

2
Colusa6.5KWilliams5.5K

Sources

  1. U.S. Census Bureau, Population Estimates Program (Vintage 2025). Subcounty resident population estimates. Retrieved 2026-09-08.