Seminole used to contain a water tower painted in 2000 by artist Tom Stovall. In late 2005, council members expressed dissatisfaction with the design, but residents spoke out in its favor, feeling it made Seminole unique and provided a good landmark for giving directions, however the water tower is no more. As of 7/20/17 the city began to demolish the water tower. Efforts by residents to save the water tower went unsuccessful. It will be replaced by a public park.
Seminole is located at 27°50′19″N 82°47′6″W  (27.838502, -82.784913). It is surrounded by Pinellas County enclaves in all directions. Its closest neighbors are Indian Rocks Beach to the northwest, Largo to the north, Pinellas Park to the east, St. Petersburg to the south, and Madeira Beach to the west. Its main arteries are State Road 694 and Alternate U.S. Highway 19. It embraces the lower half of the lower limb of Lake Seminole.
According to the United States Census Bureau, the city has a total area of 5.6 square miles (14.6 km2), of which 5.1 square miles (13.2 km2) is land and 0.54 square miles (1.4 km2) (9.58%) is water.
As of the census of 2000, there were 10,890 people, 5,989 households, and 2,701 families residing in the city. The population density was 4,402.1 inhabitants per square mile (1,702.3/km²). There were 7,297 housing units at an average density of 2,949.7 per square mile (1,140.6/km²). The racial makeup of the city was 96.61% White, 0.48% African American, 0.34% Native American, 0.85% Asian, 0.03% Pacific Islander, 0.41% from other races, and 1.28% from two or more races. Hispanic or Latino of any race were 2.25% of the population.
There were 5,989 households out of which 12.6% had children under the age of 18 living with them, 35.4% were married couples living together, 7.4% had a female householder with no husband present, and 54.9% were non-families. 49.1% of all households were made up of individuals and 33.8% had someone living alone who was 65 years of age or older. The average household size was 1.75 and the average family size was 2.48.
In the city, the population was spread out with 11.8% under the age of 18, 3.8% from 18 to 24, 19.5% from 25 to 44, 21.3% from 45 to 64, and 43.6% who were 65 years of age or older. The median age was 59 years. For every 100 females, there were 76.2 males. For every 100 females age 18 and over, there were 72.3 males.
The median income for a household in the city was $29,179, and the median income for a family was $39,491. Males had a median income of $29,237 versus $25,588 for females. The per capita income for the city was $20,951. About 5.1% of families and 9.0% of the population were below the poverty line, including 5.7% of those under age 18 and 9.7% of those age 65 or over.
In 2010 the mean income for a household in the city was $45,730, and the median income for a family was $63,260. The per capita income for the city was $29,862.