Map - Rockland County, New York (Rockland County)

Rockland County is the southernmost county on the west side of the Hudson River in the U.S. state of New York. It is part of the New York metropolitan area. It is about 6 mi from the Bronx at their closest points. The county's population, as of the 2020 United States Census, is 338,329, making it the state's third-most densely populated county outside New York City (after Nassau and neighboring Westchester Counties, respectively). The county seat and largest city is New City. Rockland County is accessible via the New York State Thruway, which crosses the Hudson to Westchester at the Tappan Zee Bridge ten exits up from the NYC border, as well as the Palisades Parkway five exits up from the George Washington Bridge. The county's name derives from "rocky land", as the area has been aptly described, largely due to the Hudson River Palisades.

Rockland County is the smallest county by area in New York outside New York City. It comprises five towns and nineteen incorporated villages, with numerous unincorporated villages (sixteen) and hamlets. Rockland County is designated as a Preserve America Community, and nearly a third of the county's area is parkland. The county has the largest Jewish population percentage of any U.S. county, at 31.4%, or 90,000 residents. Rockland also ranked 31st on the list of highest-income counties by median household income in the United States, with a median household income of $82,534 according to the 2010 census.

The area that became Rockland County was originally inhabited by Algonquian-speaking Native Americans, including Munsees, or Lenni Lenape. The Tappan tribe had a particularly noteworthy presence in the area, extending from present-day Nyack, south to Sparkill and Tappan, down the Hackensack River valley through present-day Bergen County, NJ, and also along the Palisades and Hudson shore all the way down to present-day Edgewater, NJ.

In 1609, Henry Hudson was the first major Dutch explorer to arrive in the area. Hudson, thinking he had found the legendary "Northwest Passage", sailed on the Half Moon up the river that would one day bear his name, and sailing through the area that is now Haverstraw before exploring north towards what is now Albany. In the years before 1664 when the area was formally a Dutch colony called New Netherland, present-day Rockland did not have formal European settlements. However, individuals did explore the area and made transactions with Tappan tribe for land with the idea that it could have future use. For example, in 1640, Dutch Captain David Pietersz. de Vries purchased from natives the area where the Sparkill Creek flows into the Hudson River.

In 1664, the British Crown assumed control of New Netherland from the Dutch. In June 1664, the Berkeley-Carteret land grant established the colony of New Jersey, dividing present-day Rockland and Bergen Counties into separate political areas. The northern border of New Jersey was placed in a straight line from the Delaware River at present-day Port Jervis to the Hudson River at 41 degrees even North latitude, where the Palisades Cliffs pause and give way to Sneden's Landing in Orangetown. The state line remains there to this day, though various disagreements along the exact border were had over the years.

In the 1670s, permanent Dutch settlers began to arrive with land grants, starting with the Tappan area. These settlers were eager to escape "city life", moving from Manhattan to Rockland. A number of unique, Dutch-style red sandstone houses still stand, and many place names in the county reveal their Dutch origin.

In 1683, when the Duke of York (who became King James II of England) established the first 12 counties of New York, present-day Rockland County was part of Orange County, known then as "Orange County South of the Mountains". Orangetown was created at the same time under a royal grant, originally encompassing all of modern Rockland County. Around this time, as the English began to colonize Nyack and Tappan, the Native Americans began to leave Rockland in search of undisturbed land further north.

The natural barrier of the Ramapo Mountains and the size of the county made carrying out governmental activities difficult. At one point, two governments were active, one on each side of the Ramapo Mountains, so Rockland split off from Orange in 1798 to form its own county. That same year, the county seat was transferred from Tappan to New City, where a new courthouse was built.

Haverstraw was separated from Orangetown in 1719, and became a town in 1788; it included the present-day Clarkstown, Ramapo, and Stony Point. Clarkstown and Ramapo became towns in 1791, followed by Stony Point in 1865.

During the American Revolution, when control of the Hudson River was viewed by the British as strategic to dominating the American territories, Rockland had skirmishes at Haverstraw, Nyack, and Piermont, and significant military engagements at the Battle of Stony Point, where General "Mad" Anthony Wayne earned his nickname. George Washington had headquarters for a time at John Suffern's tavern, the later site of the village of Suffern. British Major John André met with American traitor Benedict Arnold near Stony Point to buy the plans for the fortifications at West Point. André was captured with the plans in Tarrytown on his way back to the British lines; he was brought to Tappan for trial in the Tappan church, found guilty, hanged, and buried nearby. Still another important chapter in the story of the Revolution was written on May 5, 1783, when General Washington received Sir Guy Carleton at the DeWint House, where they discussed terms of a peace treaty. Two days later, Washington visited Sir Guy aboard a British war vessel H.M.S Perseverance. On this day, the king's navy fired its first salute to the flag of the United States of America.