Martinez is a city located in Contra Costa County California. It is also the county seat of Contra Costa County. With a 2020 population of 37,579, it is the 229th largest city in California and the 1191st largest city in the United States. Martinez is currently growing at a rate of 0.39% annually but its population has decreased by -2.13% since the most recent census, which recorded a population of 38,397 in 2020. Spanning over 14 miles, Martinez has a population density of 2,975 people per square mile.
The average household income in Martinez is $128,788 with a poverty rate of 5.51%. The median rental costs in recent years comes to $1,854 per month, and the median house value is $622,800. The median age in Martinez is 42.6 years, 40.6 years for males, and 44.9 years for females.
According to the most recent ACS, the racial composition of Martinezwas:
Rate of Home Ownership
Average Family Size
Average Household Size
The highest rate of high school graduation is among white people with a rate of 97.60%.
The highest rate of bachelors degrees is among asian people with a rate of 59.68%.
83.42% of Martinez residents speak only English, while 16.58% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 7.24% of the population.
Overall Poverty Rate
Male Poverty Rate
Female Poverty Rate
The race most likely to be in poverty in Martinez is Black, with 17.00% below the poverty level.
The race least likely to be in poverty in Martinez is Hispanic, with 3.41% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 1.27%. Among those working part-time, it was 9.70%, and for those that did not work, the poverty rate was 11.05%.
Number of Veterans
Veteran Poverty Rate
Veteran Disability Rate
Labor Force Participation
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
Born in Martinez
88.16% of Martinez residents were born in the United States, with 68.34% having been born in California. 2.93% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.