National protected areas

• Fort Caroline National Memorial
• Timucuan Ecological and Historic Preserve

Adjacent counties

• Nassau County - north and northwest
• St. Johns County - southeast
• Clay County - southwest
• Baker County - west

2010 Census

U.S. Census Bureau 2010 Ethnic/Race Demographics:^[12][13]

• White (non-Hispanic) (60.9% when including White Hispanics): 56.6% (10.7% German, 10.6% Irish, 9.2% English, 4.1% Italian, 2.3% French, 2.1% Scottish, 2.1% Scotch-Irish, 1.8% Polish, 1.2% Dutch, 0.6% Russian, 0.6% Swedish, 0.6% Norwegian, 0.5% Welsh, 0.5% French Canadian)^[12]
• Black (non-Hispanic) (29.5% when including Black Hispanics): 28.9% (1.7% Subsaharan African, 1.4% West Indian/Afro-Caribbean American [0.5% Haitian, 0.4% Jamaican, 0.1% Other or Unspecified West Indian, 0.1% Bahamian])^[12][14]
• Hispanic or Latino of any race: 7.6% (2.5% Puerto Rican, 1.7% Mexican, 0.8% Cuban)^[12][15]
• Asian: 4.2% (1.7% Filipino, 0.8% Indian, 0.6% Other Asian, 0.4% Vietnamese, 0.3% Chinese, 0.2% Korean, 0.1% Japanese)^[12][13]
• Two or more races: 2.9%
• American Indian and Alaska Native: 0.4%
• Native Hawaiian and Other Pacific Islander: 0.1%^[12][13]
• Other Races: 2.1% (0.9% Arab)^[12]

In 2010, 6.7% of the population considered themselves to be of only "American" ancestry (regardless of race or ethnicity.)^[12]

Of the 342,450 households 28.68% had children under the age of 18 living with them, 41.92% were married couples living together, 16.74% had a female householder with no husband present, and 36.27% were non-families. 24.85% of households were one person and 8.05% (2.29% male and 5.76% female) had someone living alone who was 65 or older. The average household size was 2.47 and the average family size was 3.04.^[13][16]

The age distribution was 23.5% under the age of 18, 10.5% from 18 to 24, 28.4% from 25 to 44, 26.4% from 45 to 64, and 11.1% 65 or older. The median age was 35.8 years. For every 100 females there were 94.3 males. For every 100 females age 18 and over, there were 91.6 males.^[16]

The median household income was $49,463 and the median family income was $60,114. Males had a median income of $42,752 versus $34,512 for females. The per capita income for the county was $25,854. About 10.4% of families and 14.2% of the population were below the poverty line, including 20.3% of those under age 18 and 9.6% of those aged 65 or over.^[17]

In 2010, 9.0% of the county's population was foreign born, with 49.5% being naturalized American citizens. Of foreign-born residents, 38.2% were born in Latin America, 35.6% born in Asia, 17.9% were born in Europe, 5.8% born in Africa, 2.0% in North America, and 0.5% were born in Oceania.^[12]

2000 Census

The racial makeup of the county was 65.80% White (63.6% were Non-Hispanic White,)^[18] 27.83% African American or Black, 0.33% Native American, 2.71% Asian, 0.06% Pacific Islander, 1.31% from other races, and 1.96% from two or more races. 4.10% of the population were Hispanic or Latino of any race.

Of the 303,747 households 33.30% had children under the age of 18 living with them, 46.50% were married couples living together, 15.60% had a female householder with no husband present, and 33.60% were non-families. 26.50% of households were one person and 7.80% were one person aged 65 or older. The average household size was 2.51 and the average family size was 3.06.

The age distribution was 26.30% under the age of 18, 9.60% from 18 to 24, 32.40% from 25 to 44, 21.20% from 45 to 64, and 10.50% 65 or older. The median age was 34 years. For every 100 females there were 94.20 males. For every 100 females age 18 and over, there were 90.90 males.

The median household income was $40,703 and the median family income was $47,689. Males had a median income of $32,954 versus $26,015 for females. The per capita income for the county was $20,753. 11.90% of the population and 9.20% of families were below the poverty line, including 16.40% of those under the age of 18 and 11.60% of those age 65 or older.

Languages

As of 2010, 87.36% of all residents spoke English as their first language, while 5.74% spoke Spanish, 1.18% Tagalog, 0.53% Arabic, 0.48% Serbo-Croatian, 0.47% Vietnamese, and 0.46% of the population spoke French Creole (mostly Haitian Creole) as their mother language.^[19] In total, 12.64% of the population spoke languages other than English as their primary language.^[19]

Voter registration

According to the Secretary of State's office, Democrats comprise a plurality of registered voters in Duval County.

Statewide and national elections

Duval County is somewhat conservative for an urban county, and it began moving away from the Democratic Party sooner than the majority of Florida counties. Despite the small Democratic plurality in registration, the county's Democrats are nowhere near as liberal as their counterparts in other large Florida counties, such as Miami-Dade and Orange. The county has only supported a Democrat for president three times since 1952, in 1960, 1976, and 2020.

However, the Republican edge in Duval has lessened somewhat in recent years. It swung from a 16-point win for George W. Bush in 2004 to only a three-point win for John McCain in 2008. Mitt Romney won an equally narrow margin in 2012 and in 2016, Donald Trump only won the county by fewer than 6,000 votes even as he narrowly carried Florida. In 2020, Joe Biden, despite losing statewide, broke the 44-year Democratic drought in Duval County, winning by less than four points.

In 2018, Andrew Gillum, despite losing the election, won Duval by four points, the first time a Democrat had won the county in a gubernatorial election since Steve Pajcic's losing bid in 1986. Four years later, however, Duval rebounded to vote for Ron DeSantis by over 10 points. In the Senate elections, Bill Nelson only failed to carry the county in his first bid in 2000, and Lawton Chiles and Bob Graham carried the county in all three of their respective bids.

Public transportation

Public transportation is provided by the Jacksonville Transportation Authority.

Major highways

• I-10 / SR 8
• I-95 / SR 9
• I-295 / SR 9A
• US 1 / SR 5
• 
  US 1 Alt.
• US 17 / SR 15
• US 23 / SR 139
• US 90
• 
  US 90 Alt.
• US 301 / SR 200
• SR A1A
• SR 9B
• SR 10

Airports

• Cecil Airport
• Herlong Recreational Airport
• Jacksonville Executive at Craig Airport
• Jacksonville International Airport