O Brien is located in Florida. O Brien, Florida has a population of 4,088. O Brien is more family-centric than the surrounding county with 30% households with children. The county percentage for households with children is 24%.
The median household income in O Brien, Florida is $41,550. The median household income for the surrounding county is $43,947 compared to the national median of $61,963. The median age of people living in O Brien is 47.8 years.
The average high temperature in July is 91.86 degrees, with an average low temperature in January of 41.46 degrees. The annual precipitation is 54.26.