Historic New Castle Court House
Address: 211 Delaware Street, New Castle, DE 19720
Located in the heart of the New Castle Historic District, just off The Green.
When Was the Court House Built?
The current structure was completed in 1732 during Delaware’s colonial period, when the area was still part of Pennsylvania under William Penn’s governance.
At the time, it served as:
- A courthouse
- A legislative meeting space
- A center of colonial government
It was the second courthouse on the site. The first was constructed in 1677 under Dutch control but was replaced after deterioration and political transition.
The 1776 Moment That Changed Delaware
The building became nationally significant on June 15, 1776.
Inside this courthouse, Delaware’s Assembly voted to separate from both:
-
Great Britain
-
Pennsylvania
That vote created Delaware as its own independent state, weeks before the Declaration of Independence was signed in Philadelphia.
That means Delaware declared independence in this building before July 4 was widely recognized.
Fun historical trivia: Delaware was the first state to ratify the U.S. Constitution on December 7, 1787. The independence vote here set that trajectory in motion.
The Twelve-Mile Circle
One of the most unusual legal boundaries in the United States originates here.
The courthouse cupola marks the center of the Twelve-Mile Circle, which defines Delaware’s northern boundary. The circle was drawn with a 12-mile radius from the courthouse tower.
It remains one of the only circular state boundaries in America. You can literally tie modern geography back to this building.
That’s SEO gold and genuinely fascinating.
Architectural Features
The structure reflects Georgian colonial architecture, including:
- Brick construction
- Symmetrical façade
- Steep roofline
- Central cupola
The cupola was restored after fires and weather damage over the centuries, but its symbolic importance remains intact.
Inside, you’ll find:
- Courtroom chambers
- Legislative meeting rooms
- Period furnishings
- Interpretive exhibits
Transition to a Museum
The courthouse stopped functioning as an active court in the 1880s. It later became part of the Delaware Division of Historical and Cultural Affairs.
Today it operates as a museum interpreting:
- Colonial governance
- Early American law
- Delaware’s path to statehood
- The role of New Castle in early American politics
It’s part of what’s often referred to as “The First State National Historical Park,” though that designation came much later in 2013 when the National Park Service established the federal historic site.