As of the census of 2000, there were 210,554 people, 63,815 households, and 49,775 families residing in the county. The population density was 109 people per square mile (42/km²). There were 68,373 housing units at an average density of 36 per square mile (14/km²). The racial makeup of the county was 56.21% White, 3.83% Black or African American, 1.19% Native American, 6.80% Asian, 0.19% Pacific Islander, 26.13% from other races, and 5.65% from two or more races. 45.34% of the population were Hispanic or Latino of any race. 6.6% were of Portuguese and 6.0% German ancestry according to Census 2000. 55.1% spoke English, 35.3% Spanish, 3.2% Hmong, 2.9% Portuguese and 1.0% Punjabi as their first language.
There were 63,815 households out of which 45.4% had children under the age of 18 living with them, 57.8% were married couples living together, 14.1% had a female householder with no husband present, and 22.0% were non-families. 17.7% of all households were made up of individuals and 7.4% had someone living alone who was 65 years of age or older. The average household size was 3.25 and the average family size was 3.69.
In the county the population was spread out with 34.5% under the age of 18, 10.3% from 18 to 24, 27.9% from 25 to 44, 17.8% from 45 to 64, and 9.5% who were 65 years of age or older. The median age was 29 years. For every 100 females there were 99.3 males. For every 100 females age 18 and over, there were 96.6 males.
The median income for a household in the county was $35,532, and the median income for a family was $38,009. Males had a median income of $31,721 versus $23,911 for females. The per capita income for the county was $14,257. About 16.9% of families and 21.7% of the population were below the poverty line, including 28.4% of those under age 18 and 10.7% of those age 65 or over.
Merced Municipal Airport, located just southwest of downtown Merced, has a few commercial passenger flights. General aviation airports in the county include Castle Airport, Gustine Airport, and Los Banos Municipal Airport [1].