Norrisville is an unincorporated community

Unincorporated area

In law, an unincorporated area is a region of land that is not a part of any municipality.To "incorporate" in this context means to form a municipal corporation, a city, town, or village with its own government. An unincorporated community is usually not subject to or taxed by a municipal government...

 in Harford County

Harford County, Maryland

Harford County is a county in the U.S. state of Maryland. In 2010, its population was 244,826. Its county seat is Bel Air. Harford County forms part of the Baltimore-Washington Metropolitan Area.-History:...

, Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

, just south of the Pennsylvania

Pennsylvania

The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...

 state line in the extreme northwest section of the county. It is primarily a farming community full of rolling hills and small valleys, and is part of the Deer Creek

Deer Creek (Maryland)

Deer Creek is a river in Maryland that flows through the scenic areas of Harford County and empties into the Susquehanna River, roughly halfway between the Interstate 95 bridge and Conowingo Dam...

 watershed. The area is served by two state roads, Maryland routes 23

Maryland Route 23

Maryland Route 23 is a state highway in the U.S. state of Maryland. The state highway runs from U.S. Route 1 in Hickory north and west to the Pennsylvania state line near Norrisville, where the highway continues as Pennsylvania Route 24 . MD 23 is an L-shaped highway in northwestern Harford...

 and 136

Maryland Route 136

Maryland Route 136 is a state highway in the U.S. state of Maryland. The state highway runs from MD 7 near Abingdon north to MD 23 in Norrisville. MD 136 is an L-shaped route that connects the communities of Creswell, Churchville, Dublin, and Whiteford in eastern Harford County with each other...

. A demographic profile estimates that the Norrisville area had a population of 2,931 as of 2000. It lies at an elevation of 741 feet (225.9 m). Norrisville is part of the White Hall zip code 21161, whose post office is located just over the Baltimore County line.