As of 2010, there were 183,994 households of which 14% were vacant. As of 2000, 26.3% had chidlren under the age of 18 living with them, 36.6% were married couples living together, 18.7% have a female head of household with no husband present, and 37.9% were non-families. 30.4% of all households were made up of individuals and 12.5% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.25. The age distribution was 21.7% under the age of 18, 8.8% from 18-24, 30.3% from 25 to 44, 22.1% from 45 to 64, and 17.0% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 98.9 males. For every 100 females age 18 and over, there were 97.3 males. 



In 2009, the median income for a household in the city was $29,812, and the median income for a family was $33,814. The per capita income for the city was $19,846. About 21.7% of families and 26.3% of the population were below the poverty line. 

In 1960, non-Hispanic whites represented 80% of Miami-Dade county's population.[75] In 1970, the Census Bureau reported Miami's population as 45.3% Hispanic, 32.9% non-Hispanic White, and 22.7% Black.[76] Miami's explosive population growth has been driven by internal migration from other parts of the country, primarily up until the 1980s, as well as by immigration, primarily from the 1960s to the 1990s. Today, immigration to Miami has slowed significantly and Miami's growth today is attributed greatly to its fast urbanization and high-rise construction, which has increased its inner city neighborhood population densities, such as in Downtown, Brickell, and Edgewater, where one area in Downtown alone saw a 2,069% increase in population in the 2010 Census. Miami is regarded as more of a multicultural mosaic, than it is a melting pot, with residents still maintaining much of, or some of their cultural traits. The overall culture of Miami is heavily influenced by its large population of Hispanics, and Blacks, mainly from the Caribbean islands.

There has been a Norwegian Seamen's church in Miami since the early 1980s. In November 2011, Crown Princess Mette-Marit opened a new building for the church. The church was built as a center for the 10,000 Scandinavians that live in Florida. Around 4,000 of them are Norwegian. The church is also an important place for the 150 Norwegians that work at Disney World.[77]



As of 2000, speakers of Spanish as their first language accounted for 66.75% of residents, English by 25.45%, Haitian Creole by 5.20%, and French speakers comprised 0.76% of the population. Other languages that were spoken throughout the city include Portuguese at 0.41%, German at 0.18%, Italian at 0.16%, Arabic at 0.15%, Chinese at 0.11%, and Greek at 0.08% of the population. Miami also has one of the largest percentage populations in the U.S. that have residents who speak first languages other than English at home (74.55%). Due to English-speakers moving away from the area, the percentage of residents who speak only English is expected to continue to decline.