Cities and Towns in New Castle County, Delaware
Founded in 1664, New Castle County is one of 3 counties in the state of Delaware. Historically, New Castle County was formed from formally New Amstel. The city of Wilmington is the county seat. With FIPS code of 3, New Castle County has a population of 571,708 and area of 494 square miles (1,279 km²).
List of all cities in New Castle County, DE alphabetically
| City/Town | Postal Code | Area Code |
| Arden, DE | 19810 | 302 |
| Astrazeneca, DE | 19897 | 302 |
| Avon Products Inc, DE | 19712 | 302 |
| Bank of America, DE | 19884 | 302 |
| 19886 | 302 | |
| 19891 | 302 | |
| Bear, DE | 19701 | 302 |
| Bellefonte, DE | 19809 | 302 |
| Blackbird, DE | 19734 | 302 |
| Chase Manhattan Bank N A, DE | 19893 | 302 |
| Christiana, DE | 19702 | 302 |
| Christiana Medical Center, DE | 19718 | 302 |
| Citibank, DE | 19721 | 302 |
| 19892 | 302 | |
| Claymont, DE | 19703 | 302 |
| Delaware City, DE | 19706 | 302 |
| Delmarva Power, DE | 19895 | 302 |
| Dupont Co Inc, DE | 19898 | 302 |
| Edgemoor, DE | 19802 | 302 |
| 19809 | 302 | |
| 19810 | 302 | |
| Elsmere, DE | 19805 | 302 |
| Greenville, DE | 19807 | 302 |
| 19884 | 302 | |
| Hercules Incorporated, DE | 19894 | 302 |
| Hockessin, DE | 19707 | 302 |
| Kirkwood, DE | 19708 | 302 |
| Manor, DE | 19720 | 302 |
| Marshallton, DE | 19808 | 302 |
| Middletown, DE | 19709 | 302 |
| Minquadale, DE | 19720 | 302 |
| Montchanin, DE | 19710 | 302 |
| New Castle, DE | 19720 | 302 |
| 19721 | 302 | |
| Newark, DE | 19702 | 302 |
| 19711 | 302 | |
| 19712 | 302 | |
| 19713 | 302 | |
| 19714 | 302 | |
| 19715 | 302 | |
| 19716 | 302 | |
| 19717 | 302 | |
| 19718 | 302 | |
| 19725 | 302 | |
| 19726 | 302 | |
| Newport, DE | 19804 | 302 |
| Odessa, DE | 19730 | 302 |
| Port Penn, DE | 19731 | 302 |
| Rockland, DE | 19732 | 302 |
| Saint Georges, DE | 19733 | 302 |
| Shared Firm Zip, DE | 19725 | 302 |
| 19726 | 302 | |
| 19885 | 302 | |
| 19886 | 302 | |
| Stanton, DE | 19804 | 302 |
| Talleyville, DE | 19803 | 302 |
| Talleyville Postal Store, DE | 19803 | 302 |
| Townsend, DE | 19734 | 302 |
| Verizon, DE | 19896 | 302 |
| Wilmington, DE | 19801 | 302 |
| 19802 | 302 | |
| 19803 | 302 | |
| 19804 | 302 | |
| 19805 | 302 | |
| 19806 | 302 | |
| 19807 | 302 | |
| 19808 | 302 | |
| 19809 | 302 | |
| 19810 | 302 | |
| 19850 | 302 | |
| 19880 | 302 | |
| 19884 | 302 | |
| 19885 | 302 | |
| 19886 | 302 | |
| 19890 | 302 | |
| 19891 | 302 | |
| 19892 | 302 | |
| 19893 | 302 | |
| 19894 | 302 | |
| 19895 | 302 | |
| 19896 | 302 | |
| 19897 | 302 | |
| 19898 | 302 | |
| 19899 | 302 | |
| Wilmington Trust, DE | 19890 | 302 |
| Winterthur, DE | 19735 | 302 |
| Yorklyn, DE | 19736 | 302 |
Major Cities and Towns in New Castle County, Delaware
Wilmington
Area, Population, Zip Codes, and Coordinates
- Area: 17.0 square miles
- Population: Approximately 70,898 (2020 Census)
- Zip Codes: 19801, 19802, 19803, 19804, 19805, 19806, 19807, 19808, 19809, 19810
- Latitude and Longitude: 39.7391° N, 75.5398° W
Location and History
Wilmington is the largest city in Delaware and the county seat of New Castle County, located at the confluence of the Christina River and Brandywine Creek, near the Delaware River. Founded in 1638 by Swedish settlers, Wilmington is one of the oldest cities in the United States. The city was initially named Fort Christina, but was renamed Wilmington in 1739 in honor of Spencer Compton, Earl of Wilmington. Wilmington’s location made it an important center for shipping, milling, and manufacturing during the 18th and 19th centuries. The city played a crucial role in the American Revolution and later became a hub for industrial development, particularly in the chemical and banking industries. Today, Wilmington is a vibrant city known for its diverse economy, rich history, and cultural attractions.
Major Schools and Landmarks
Wilmington is served by several school districts, including the Red Clay Consolidated School District and Brandywine School District, with notable institutions such as Wilmington Charter School and Mount Pleasant High School. The city is also home to several colleges, including Delaware Technical Community College and Widener University Delaware Law School. Major landmarks in Wilmington include the DuPont Building, a historic skyscraper that symbolizes the city’s industrial heritage, and the Grand Opera House, a historic theater that hosts a variety of performances. The Delaware Art Museum, known for its collection of Pre-Raphaelite art, and the Hagley Museum and Library, which explores the history of the DuPont Company and early American industry, are also key cultural institutions in the city. Wilmington’s Riverfront area, with its parks, restaurants, and entertainment venues, is a major attraction for both residents and visitors.
Newark
Area, Population, Zip Codes, and Coordinates
- Area: 9.4 square miles
- Population: Approximately 33,673 (2020 Census)
- Zip Codes: 19702, 19711, 19713, 19716
- Latitude and Longitude: 39.6837° N, 75.7497° W
Location and History
Newark is a city located in western New Castle County, near the Maryland border. The city was founded in 1694 by Welsh and Scottish settlers, and it has grown over the centuries into a bustling college town. Newark is best known as the home of the University of Delaware, which was established in 1743 and is one of the oldest universities in the United States. The presence of the university has shaped the city’s character, making it a center for education, research, and innovation. Newark’s history is also tied to agriculture and manufacturing, with several historic mills and farms located in the area. The city has retained much of its historic charm, with a vibrant downtown area that blends old and new.
Major Schools and Landmarks
Newark is served by the Christina School District, with Newark High School and Downes Elementary School being key educational institutions. The city is also home to the University of Delaware, a major research university that plays a central role in the community. Major landmarks in Newark include the historic Old College, a Georgian-style building on the University of Delaware campus that houses the university’s art galleries and museums. The Newark Reservoir, offering scenic views and recreational opportunities, and the White Clay Creek State Park, known for its hiking trails and natural beauty, are also significant landmarks. Newark’s Main Street, with its shops, restaurants, and cultural venues, is the heart of the city and a popular destination for residents and visitors alike.
Middletown
Area, Population, Zip Codes, and Coordinates
- Area: 12.0 square miles
- Population: Approximately 22,582 (2020 Census)
- Zip Codes: 19709
- Latitude and Longitude: 39.4543° N, 75.7164° W
Location and History
Middletown is a rapidly growing town located in southern New Castle County. The town was founded in the 17th century and was originally a crossroads settlement known for its central location between the headwaters of the Appoquinimink River and the Bohemia River. Middletown developed as an agricultural community, with farms producing crops such as wheat, corn, and peaches. The arrival of the railroad in the 19th century spurred further growth, making Middletown a key transportation and commercial hub. In recent decades, Middletown has experienced significant suburban expansion, attracting new residents with its affordable housing, excellent schools, and proximity to major cities like Wilmington and Philadelphia.
Major Schools and Landmarks
Middletown is served by the Appoquinimink School District, with Appoquinimink High School and Middletown High School being the primary educational institutions. The town is also home to St. Georges Technical High School, offering specialized vocational training. Major landmarks in Middletown include the historic Everett Theatre, a restored 1920s movie theater that hosts live performances and community events, and the Cochran Grange, a historic farmstead that dates back to the 18th century. The town’s annual Olde Tyme Peach Festival celebrates Middletown’s agricultural heritage with parades, crafts, and entertainment. The nearby Silver Lake Park, offering a lake, trails, and picnic areas, is a popular spot for outdoor recreation.
New Castle
Area, Population, Zip Codes, and Coordinates
- Area: 3.2 square miles
- Population: Approximately 5,374 (2020 Census)
- Zip Codes: 19720
- Latitude and Longitude: 39.6620° N, 75.5650° W
Location and History
New Castle is a historic town located along the Delaware River, just south of Wilmington. Founded in 1651 by the Dutch, New Castle is one of the oldest settlements in Delaware and has a rich colonial history. The town was originally named Fort Casimir and was later renamed New Amstel before being taken over by the English and renamed New Castle. During the colonial period, New Castle served as the capital of the Delaware Colony and was an important center for trade and government. The town’s historic district features cobblestone streets and well-preserved buildings from the 17th and 18th centuries, making it a living museum of early American history. Today, New Castle is known for its charming historic atmosphere and its role as a cultural and tourist destination.
Major Schools and Landmarks
New Castle is served by the Colonial School District, with William Penn High School and George Read Middle School being the primary educational institutions. The town is also home to the New Castle Public Library, which offers a range of services and programs for the community. Major landmarks in New Castle include the historic Old New Castle Courthouse, where Delaware declared its independence from Pennsylvania and England in 1776, and the Amstel House, a beautifully restored colonial mansion that offers tours and exhibits. Battery Park, located along the Delaware River, provides scenic views, walking trails, and picnic areas, making it a popular spot for residents and visitors. The town’s annual Separation Day celebration commemorates Delaware’s break from Pennsylvania and features parades, reenactments, and festivities.
Map of Cities in New Castle County, DE
