The Southwest Trail ran from St. Louis, Missouri, to the Red River port of Fulton in Hempstead County some twelve miles from Washington.
At the time, the Red River was the border between the United States and Mexico.
The trail was a route taken by people headed to Mexican Texas.
William B. Travis, Sam Houston, and Davy Crockett each separately traveled through Washington on their way to Texas.
In the early 1830s until the 1840s, bands of Cherokee and Choctaw travelled through Old Washington on their way to Indian Territory under the Indian removal policies of U.S. President Andrew Jackson.
In 1846, Washington was a mustering point for Arkansas troops marching south to fight under General Zachary Taylor in the Mexican War.

On February 14, 1820, Washington was authorized for a post office.
That facility remains the oldest continuous postal operation west of the Mississippi River.
A new postal building was dedicated on May 29, 1988, by then U.S. Senator David Hampton Pryor.
Washington became a town on George Washington's birthday, February 22, 1824.

From 1863-1865, Old Washington was the site of the Confederate capitol of Arkansas after the fall of Little Rock to Union forces.
The original Arkansas Confederate capital, where the refugee government fled, still exists in the park.
It is a part of the Camden Expedition Sites, named in part for the town of Camden, Arkansas, in southern Arkansas.

In the early 1864, Washington was threatened by Union forces under the command of Major General Frederick Steele which moved south along the Military Road en route to Shreveport, Louisiana.
A Confederate force under the command of Major General Sterling Price blocked Steele's army.
The two forces engaged in battle on April 10, 1864, some fourteen miles north of Washington.
Steele was forced to move east to Camden, a movement which spared Washington from invasion.
This encounter was known as the Skirmish at Prairie D'Ane.
Many wounded soldiers were brought to Washington for medical treatment.
Several buildings, including the Washington Baptist Church, were turned into hospitals to treat the wounded.
Seventy-four unknown Confederate soldiers from this battle were buried in a mass grave in the Washington Presbyterian Cemetery.

 
In the early 1870s, the Cairo and Fulton Railroad built a line through southwest Arkansas which bypassed Washington.
Instead the depot was nine miles away and became the origin of the city of Hope, incorporated on April 8, 1875.
Fire swept through Washington on July 3, 1875 and destroyed much of the business district.
A second fire occurred on January 21, 1883.
Most of the businesses in Washington relocated to Hope, which proposed that it supersede Washington as the county seat.
Several fraudulent elections were held over the matter.
The Arkansas Supreme Court intervened and, in a ruling in May 1939, declared Hope the county seat.

In 1958, the Pioneer Washington Restoration Foundation began preserving the unique buildings and sites that currently lie within the park.
The park was established in 1965 and opened eight years later.
The Southwest Regional Archives was established there in 1978.
 Since that time, more than 200,000 artifacts related to 19th century life have been recovered in the park and is the site of ongoing archaeological research on small-town life.

The historic buildings provide excellent examples of the architectural styles popular in the 19th century American South.
Examples on display are Southern Greek Revival, Federal architecture, Gothic Revival, Italianate, and the rough-hewn timber or brace-frame construction of the frontier.

Visitors follow plank board sidewalks along streets that have never been paved.
The largest magnolia tree in Arkansas, planted in 1839, also graces the town.
Everything within the original 1824 boundaries of the town are listed on the National Register of Historic Places.
The Southwest Trail ran from St. Louis, Missouri, to the Red River port of Fulton in Hempstead County some twelve miles from Washington. At the time, the Red River was the border between the United States and Mexico. The trail was a route taken by people headed to Mexican Texas. William B. Travis, Sam Houston, and Davy Crockett each separately traveled through Washington on their way to Texas. In the early 1830s until the 1840s, bands of Cherokee and Choctaw travelled through Old Washington on their way to Indian Territory under the Indian removal policies of U.S. President Andrew Jackson. In 1846, Washington was a mustering point for Arkansas troops marching south to fight under General Zachary Taylor in the Mexican War.
On February 14, 1820, Washington was authorized for a post office. That facility remains the oldest continuous postal operation west of the Mississippi River. A new postal building was dedicated on May 29, 1988, by then U.S. Senator David Hampton Pryor. Washington became a town on George Washington's birthday, February 22, 1824.
From 1863-1865, Old Washington was the site of the Confederate capitol of Arkansas after the fall of Little Rock to Union forces. The original Arkansas Confederate capital, where the refugee government fled, still exists in the park. It is a part of the Camden Expedition Sites, named in part for the town of Camden, Arkansas, in southern Arkansas.
In the early 1864, Washington was threatened by Union forces under the command of Major General Frederick Steele which moved south along the Military Road en route to Shreveport, Louisiana. A Confederate force under the command of Major General Sterling Price blocked Steele's army. The two forces engaged in battle on April 10, 1864, some fourteen miles north of Washington. Steele was forced to move east to Camden, a movement which spared Washington from invasion. This encounter was known as the Skirmish at Prairie D'Ane. Many wounded soldiers were brought to Washington for medical treatment. Several buildings, including the Washington Baptist Church, were turned into hospitals to treat the wounded. Seventy-four unknown Confederate soldiers from this battle were buried in a mass grave in the Washington Presbyterian Cemetery.
 
In the early 1870s, the Cairo and Fulton Railroad built a line through southwest Arkansas which bypassed Washington. Instead the depot was nine miles away and became the origin of the city of Hope, incorporated on April 8, 1875. Fire swept through Washington on July 3, 1875 and destroyed much of the business district. A second fire occurred on January 21, 1883. Most of the businesses in Washington relocated to Hope, which proposed that it supersede Washington as the county seat. Several fraudulent elections were held over the matter. The Arkansas Supreme Court intervened and, in a ruling in May 1939, declared Hope the county seat.
In 1958, the Pioneer Washington Restoration Foundation began preserving the unique buildings and sites that currently lie within the park. The park was established in 1965 and opened eight years later. The Southwest Regional Archives was established there in 1978.  Since that time, more than 200,000 artifacts related to 19th century life have been recovered in the park and is the site of ongoing archaeological research on small-town life.
The historic buildings provide excellent examples of the architectural styles popular in the 19th century American South. Examples on display are Southern Greek Revival, Federal architecture, Gothic Revival, Italianate, and the rough-hewn timber or brace-frame construction of the frontier.
Visitors follow plank board sidewalks along streets that have never been paved. The largest magnolia tree in Arkansas, planted in 1839, also graces the town. Everything within the original 1824 boundaries of the town are listed on the National Register of Historic Places.
Historic Washington State Park