O Brien Real EstateO Brien is located in Florida. O Brien, Florida has a population of 3,172. O Brien is more family-centric than the surrounding county with 45.49% of the households containing married families with children. The county average for households married with children is 24.61%. The median household income in O Brien, Florida is $45,823. The median household income for the surrounding county is $40,600 compared to the national median of $57,652. The median age of people living in O Brien is 35.3 years. O Brien WeatherThe average high temperature in July is 92 degrees, with an average low temperature in January of 39.6 degrees. The average rainfall is approximately 54.1 inches per year, with 0 inches of snow per year. O Brien MapReal estate near O BrienNearby CitiesNearby Cities Homes for Sale |