Linthicum is an unincorporated village and CDP located in the U.S. state of Maryland. It is within Anne Arundel County on Baltimore-Washington International Thurgood Marshall Airport to the north. It has a total area of 5.5 square miles at 39°12′14″N 76°39′38″W. The elevation is 138 feet above sea level. In 2006, the Linthicum Heights Historic District was seeded on the National Register of Historic Places. As of the 2010 census data, it had a total population of 10,324. The population density was 1,891/sq mi. Estimated per capita income in 2016 was $39,145. It has Zip code 20903.