Contra Costa County

Martinez, CA Business Index

Martinez is a city in Contra Costa County with an estimated 36,849 residents as of 2025, down 0.9% since 2020. Martinez's business base is indexed below across 48 owner-operated industries.

Population (2025)
36,849
U.S. Census Bureau estimate
Change since 2020
-0.9%
2020–2025
Land area
12.6 sq mi
2023 Census Gazetteer
Density
2,915/sq mi
Residents per square mile

Population trend

Annual resident population estimates, U.S. Census Bureau Population Estimates Program.

YearPopulationYear over year
202037,171n/a
202136,937-0.63%
202236,659-0.75%
202336,734+0.20%
202436,923+0.51%
202536,849-0.20%

Martinez holds 3.1% of Contra Costa County’s 1,170,070 residents.

Industries in Contra Costa County

Martinez businesses compete in the Contra Costa County market. Establishment counts, employment and payroll below are reported at county level by the U.S. Census Bureau.

HVAC & PlumbingViewElectricalViewRoofingViewLandscapingViewPest ControlViewPool ServiceViewCommercial CleaningViewFlooringViewGlass & GlazingViewSeptic & WellViewAuto RepairViewAuto BodyViewCar WashViewTowingViewTruckingViewEquipment RentalViewDentalViewVeterinaryViewHome HealthViewPharmacyViewMedical PracticeViewOptometryViewAccountingViewInsurance AgencyViewIT & MSPViewStaffingViewEngineeringViewArchitectureViewLaw FirmViewSecurity ServicesViewPrintingViewSign ShopsViewMachine ShopsViewMetal FabricationView
PlasticsPending
Food ManufacturingViewMillworkViewRestaurantsViewBakeriesViewLiquor StoresViewGyms & FitnessViewSalons & SpasViewLaundromatsViewDry CleaningViewFuneral HomesViewSelf StorageViewChildcareViewPet ServicesView

Nearby cities

Other indexed places in Contra Costa County and the surrounding area.

Concord123,261Antioch118,958Richmond114,861San Ramon86,209Pittsburg77,542Walnut Creek70,012Brentwood66,607Oakley47,583Danville43,302
Data last refreshed from source on 2026-09-08.

Sources

  1. U.S. Census Bureau, Population Estimates Program (Vintage 2025). Subcounty resident population estimates. Retrieved 2026-09-08.
  2. U.S. Census Bureau, 2023 Gazetteer Files. Land area and internal point coordinates. Retrieved 2026-09-08.
  3. U.S. Census Bureau, ANSI/FIPS Place-to-County Relationship File Retrieved 2026-09-08.