Warren County constitutes part of the Allentown-Bethlehem-Easton, PA-NJ metropolitan statistical area in the Lehigh Valley and is the only New Jersey county not a part of the combined statistical areas of either New York City or Philadelphia.

At its establishment, the county consisted of the townships of Greenwich, Independence, Knowlton, Mansfield, Oxford, and the now defunct Pahaquarry.

[1] Warren County is named for Joseph Warren, a patriot during the American Revolution and Founding Father of the United States who was killed in action by British troops at the Battle of Bunker Hill, in Charlestown, Massachusetts on June 17, 1775.

The county was named for Joseph Warren, a physician, Founding Father of the United States, and major general in the American Revolutionary War who died after volunteering to fight as a private at the Battle of Bunker Hill.

Settlements of family groups became more stable, as they could store food in pottery, as well as procure more game with the bow and arrow.

Problems developed in the early 17th century when the Little Ice Age began in North America.

The Native populations had declined after epidemics of infectious diseases, for which they had no acquired immunity.

Native American populations were separated from Europe for thousands of years and had no immunity to these diseases that the Europeans brought with them.[relevant?]

Many Native American populations were weakened from starvation due to the Little Ice Age, which was coldest during the 17th century.

[1] During the French and Indian War of 1754, fortified homes or small forts were built along the Delaware River from Phillipsburg to Port Jervis, New York.

[citation needed] Hostilities between the British and the French began to spill over from the European continent into the colonies in the New World.

Blairstown, and along the eastern banks of the Delaware River to Port Jervis, New York.

Around 450 million years ago, a chain of volcanic islands collided with proto North America.

The glacier covered the top of Kittatinny Mountain and carved the terrain in the northern part of the county.

Slowly the lake drained leaving a large flat area filled with organic material.

Starting at Lake Musconetcong, the river divides the county from Morris and Hunterdon.

The Lehigh Valley starts at the terminal moraine of the Wisconsin Glacier slightly north of Belvidere.

Towns such as Blairstown, Johnsonburg, Hope and Allamuchy are in the Kittatinny Valley The highest elevation is 1,600 feet (490 m) above sea level on the Kittatinny Ridge, at two areas just south of Upper Yards Creek Reservoir, west of Blairstown.

[18] The lowest point is the confluence of the Delaware and Musconetcong rivers at the county's southern tip, at 160 feet (49 m) of elevation.

On Jenny Jump Mountain the highest point is 1,134 feet (346 m) east of the Shiloh area or south of Interstate 80.

[22] The county is part of the Allentown-Bethlehem-Easton, PA-NJ metropolitan statistical area in the Lehigh Valley.

[25][26] The 2010 United States census counted 108,692 people, 41,480 households, and 28,870 families in the county.

[9] As of the 2000 United States census[27] there were 102,437 people, 38,660 households, and 27,487 families residing in the county.

[40] Constitutional officers of Warren County are:[41] The county's prosecutor is James L. Pfeiffer of Pohatcong, who was nominated by Governor of New Jersey Phil Murphy and sworn into office in November 2019 after being confirmed by the New Jersey Senate.

[52] For the 119th United States Congress, New Jersey's 7th congressional district is represented by Thomas Kean Jr. (R, Westfield).

Route 94 in the northern part runs through Blairstown into New York state via Newton and the rest of Sussex County.

Route 173 runs near Bloomsbury into Hunterdon County, terminating at Clinton and Annandale.

By air, the county is served by Lehigh Valley International Airport in Allentown.

Thousands of trout are raised in this hatchery and also serves as an educational center for other outdoor activity.

Merrill Creek Reservoir, located in Harmony Township, is also stocked with fish and has game in the surrounding woods.