Morris County is the name of several counties in the United States:

Morris County is a county located in the U.S. state of New Jersey, about 25 mi (40 km) west of New York City. According to the 2010 United States Census, the population was 492,276, up from the 470,212 at the 2000 Census, retaining its status as the tenth-most populous county in the state; since 2010, Morris County's population has increased by 1.5% to a Census-estimated 499,727 in 2014. The county is part of the New York Metropolitan Area, and its county seat is Morristown. The most populous place was Parsippany-Troy Hills Township, with 53,238 residents at the time of the 2010 Census, while Rockaway Township, covered 45.55 square miles (118.0 km²), the largest total area of any municipality.

Morris County, as of the 2000 Census, was the sixth-wealthiest county in the United States by median household income at $77,340 (second in New Jersey behind Hunterdon County at $79,888), sixth in median family income at $89,773 (third in New Jersey behind Hunterdon County at $91,050 and Somerset County at $90,605) and ranked tenth by per capita income at $36,964 (second in New Jersey behind Somerset County at $37,970) The Bureau of Economic Analysis ranked the county as having the 16th-highest per capita income of all 3,113 counties in the United States (and the second highest in New Jersey) as of 2009. The county ranked third in the New York Metropolitan area in terms of median income.