2006 924,413 2000 921,482 1990 851,659 1980 728,531 1970 522,329 1960 374,665 1950 159,249 1940 91,852 1930 62,149 1920 28,265
As of the census of 2000, there were 921,482 people, 414,968 households, and 243,171 families residing in the county. The population density was 1,271/km² (3,292/sq mi), making it the most densely populated county in Florida. There were 481,573 housing units at an average density of 1,720 per square mile (664/km²). The racial makeup of the county was 85.85% White, 8.96% Black or African American, 0.30% Native American, 2.06% Asian, 0.05% Pacific Islander, 1.14% from other races, and 1.64% from two or more races. 4.64% of the population were Hispanic or Latino of any race.
There were 414,968 households out of which 22.10% had children under the age of 18 living with them, 44.80% were married couples living together, 10.50% had a female householder with no husband present, and 41.40% were non-families. 34.10% of all households were made up of individuals and 15.50% had someone living alone who was 65 years of age or older. The average household size was 2.17 and the average family size was 2.77.
In the county the population was spread out with 19.30% under the age of 18, 6.40% from 18 to 24, 27.30% from 25 to 44, 24.50% from 45 to 64, and 22.50% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 91.00 males. For every 100 females age 18 and over, there were 87.80 males.
The median income for a household in the county was $37,111, and the median income for a family was $46,925. Males had a median income of $32,264 versus $26,281 for females. The per capita income for the county was $23,497. About 6.70% of families and 10.00% of the population were below the poverty line, including 13.90% of those under age 18 and 8.20% of those age 65 or over.
Pinellas County has the Pinellas Suncoast Transit Authority (PSTA) as the public transit provider, with major stops at all local malls and employment centers. There are 197 buses and trolleys that serve 43 routes, in addition to the 2 express routes to downtown Tampa via the Howard Frankland and Gandy Bridges, connecting with HartLine. In addition, PSTA connects with PCPT in Tarpon Springs to continue service to western Pasco County. The 2 main bus terminals are located in downtown Clearwater and downtown St. Petersburg, with routes bisecting and crossing the entire county. During fiscal year 2005-06 PSTA transported 11,400,484 passengers.
CSX operates a former Atlantic Coast Line Railroad branch line which sees daily rail traffic from north Tampa though Safety Harbor, Clearwater, Largo, and into downtown St. Petersburg and the adjacent industrial areas. As of March, 2008, the portion in downtown St. Petersburg and the adjacent western industrial areas is abandoned and being dismantled. There is a small rail yard north of downtown St. Petersburg.
The former Seaboard Air Line branch from the western coastal portion of the county was abandoned in the latter portion of the 20th century and converted to a popular recreational trail called the Pinellas Trail.