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The definition of the northern boundary of the state is highly unusual. Most of the boundary between Delaware and Pennsylvania is defined by an arc extending 12 miles (19 km) from the cupola of the courthouse in New Castle, and is referred to as the Twelve-Mile Circle. This is the only true-arc political boundary in the United States. This border extends all of the way to the low-tide mark on the New Jersey shore, which continues down the shoreline until it again reaches the twelve-mile arc in the south; then the boundary continues in a more conventional way in the middle of the main channel (thalweg) of the Delaware River Estuary. A portion of this arc extends into Maryland to the west, and the remaining western border is a tangent to this arc that runs a bit to the east. The Wedge of land between the arc and the Maryland border was claimed by both Delaware and Pennsylvania until 1921, when Delaware's claim was confirmed.

New Castle County is the northernmost of the three counties of the U.S. state of Delaware. As of 2000 its population was 500,265. The county seat is Wilmington. The center of population of Delaware is located in New Castle County, in the town of Townsend. It is the most affluent county in the state of Delaware.

Of Interest

News from The Delaware News Journal

Review: 'Assassins' a unique experience

Sep 7, 2008 7:57 am

A musical about people who have killed or tried to kill U.S. presidents hardly sounds like it would make engaging theater.

Traffic watch

Sep 7, 2008 6:22 am

DelDOT's list of projects that may affect traffic this week.

Bishop Fran: 'He's grown in wisdom'

Sep 7, 2008 5:13 am

PARKVILLE, Md. -- As he processed into St. Ursula Catholic Church last Sunday for 12:30 p.m.

Halloween not just a day but a season

Sep 7, 2008 5:04 am

NEW YORK -- Once upon a time, Halloween was a one-day event. Then the pumpkins and parties started moving back to the weeks between Columbus Day and Oct. 31.

Discovering a new cultural palette

Sep 7, 2008 4:33 am

'Hispanic Lives, Latin Worlds -- Simple Complexities' on display

10 things to do this week

Sep 7, 2008 4:15 am

Deniro & Pacino, Clooney & Pitt, Ryan & Bening, plus all the mushrooms you can eat

It's apple harvest time at U-Pick orchards

Sep 7, 2008 4:11 am

Apple growing isn't for wimps. Apple trees require a lot more TLC than other fruit crops, from pruning to fruit thinning to spraying for insects and diseases ... especially spraying.

Hideously disfigured, a man finds love

Sep 7, 2008 4:06 am

It's hard to know whether the self-described crispy critter at the center of Andrew Davidson's unsettling debut novel is more or less loathsome after he's hideously disfigured in a fiery car crash, bu...

The Wedding

Sep 7, 2008 3:54 am

The introduction: Mike met Melanie in 1995, and they spent time together in a curious spot -- the Sunoco gas station on Elkton Road.

MTV gives Brand more U.S. exposure

Sep 7, 2008 3:18 am

In his native England, he's a comedy giant -- instantly identifiable by his Einstein-like tousle of black hair and formfitting, chest-baring, glam-rock clothes -- a television host and stand-up comic ...

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