What is a good iron level for a 19 year old female?

Depends on the lab. Not to skirt your question, but normal ranges will vary depending on the reporting laboratory. Normal ferritin (iron) ranges are generally a little higher for men than women. Normal hemoglobin ranges are more standardized and can be a reflection of normal iron stores. In adult women, a normal hemoglobin is 12.0 to 15.5 grams per deciliter.
Why check it unless. Unless you are anemic, there is no reason to check your iron level in the blood. it is test that is only useful if your hemoglobin level is low(