Madeira Beach ( ) is a city in Pinellas County, Florida, United States, bordered on the west by the Gulf of Mexico, and on the east by St. Petersburg. As of the 2020 census, the population was 3,895. Madeira Beach is known to be a quaint beach town that attracts affluent, preppy college students during the spring season. The entertainment district of John's Pass is located on the Intracoastal Waterway. The city is often referred to by locals as Mad Beach. It is named after the Portuguese island of Madeira. Geography Madeira Beach is located at . According to the United States Census Bureau, the city has a total area of , of which is land, and (68.50%) are water. The city is located on a barrier island between the Gulf of Mexico to the southwest, and Boca Ciega Bay to the northeast. One bridge, the Tom Stuart Causeway, connects Madeira Beach to the mainland, in the unincorporated community of Bay Pines. To the northwest of Madeira Beach is the town of Redington Beach, and to the southeast, across the inlet of John's Pass, is the city of Treasure Island. Demographics At the 2000 census, there were 4,511 people in 2,528 households, including 1,122 families, in the city. The population density was . There were 3,976 housing units, at an average density of . The racial makeup of the city was: 97.05% White, 0.27% African American, 0.31% Native American, 0.58% Asian, 0.04% Pacific Islander, 0.67% from other races, and 1.09% from two or more races. Hispanic or Latino of any race made up 2.37%. Of the 2,528 households: 9.1% had children under the age of 18 living with them; 35.6% were married couples living together; 5.6% had a female householder with no husband present; and 55.6% were non-families. 42.4% of households were one person, and 12.2% were one person aged 65 or older. The average household size was 1.78, and the average family size was 2.36. The age distribution was: 8.2% under the age of 18; 4.8% from 18 to 24; 29.3% from 25 to 44; 35.7% from 45 to 64; and 22.0% that are 65 or older. The median age was 48 years. For every 100 females, there were 111.3 males. For every 100 females age 18 and over, there were 110.2 males. The median household income was $36,671, and the median family income was $50,833. Males had a