According to FleaExpert.com, whether or not a flea can live in human hair is dependent upon the type of flea. While common cat and dog fleas do not often make a home on humans, the human flea can and will live in human hair.
Known as pulex irritans, human fleas are different from fleas found on cat or dogs. In addition to living on humans, pulex irritans are also found on swine. For this reason, people who work with swine may find themselves with pulex irritans. Pulex irritans look similar to dog and cat fleas, and while they can live on humans, individuals with good hygiene are not at high risk.