Althea has been given to about 17,985 people in the United States since 1880. It was most common in 1956, which makes it a midcentury name.
Its best year was 1956, when 388 babies were given the name, ranking 475th. The typical living American called Althea is about 61 years old today. It is relatively most common in Oregon, where it accounts for 0.02% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.