New Castle County Post Offices

125 Rickey Blvd
Bear, Delaware 19701

105 Johnson Way
New Castle, Delaware 19720

3430 Philadelphia Pike
Claymont, Delaware 19703

54 Clinton St
Delaware City, Delaware 19706

4901 Governor Printz Blvd
Wilmington, Delaware 19809

110 E Main St
Newark, Delaware 19711

3801 Kennett Pike Ste A101
Wilmington, Delaware 19807

651 Valley Rd
Hockessin, Delaware 19707

2501 Red Lion Rd
Kirkwood, Delaware 19708

1500 Lancaster Ave
Wilmington, Delaware 19805

100 McMullen Ave
New Castle, Delaware 19720

3434 Old Capitol Trl
Wilmington, Delaware 19808

298 E Main St
Middletown, Delaware 19709

101 Stone Block Row
Montchanin, Delaware 19710

401 Ogletown Rd
Newark, Delaware 19711

1704 W Newport Pike
Wilmington, Delaware 19804

312 Main St
Odessa, Delaware 19730

3 S Congress St
Port Penn, Delaware 19731

700 Rockland Rd
Rockland, Delaware 19732

500 Delaware Ave Ste 1
Wilmington, Delaware 19801

201 Broad St
Saint Georges, Delaware 19733

3505 Silverside Rd Ste 103
Wilmington, Delaware 19810

400 Main St
Townsend, Delaware 19734

3911 Concord Pike
Wilmington, Delaware 19803

147 Quigley Blvd
New Castle, Delaware 19720

1149 Yorklyn Rd
Yorklyn, Delaware 19736

New Castle County

There are 26 US Post Offices in New Castle County serving a total of 581,471 residents equating to 22,364 residents per post office. It's estimated that approximately 928,093 packages are handled across the 26 county post offices annually. New Castle County is the northernmost of the three counties of the U.S. state of Delaware. As of the 2010 census, the population was 538,479, making it the most populous county in Delaware. The county seat is Wilmington. New Castle County is included in the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metropolitan Statistical Area. The county is named after the English city of Newcastle. New Castle County has the highest population and population density of any Delaware county, even though it is the smallest. It is also the most economically developed of the three. New Castle County Executive Tom Gordon took office on November 13, 2012. New Castle County is home to two minor league sports teams: the Wilmington Blue Rocks (baseball) and the Delaware 87ers (basketball) which play in Newark. It also has a professional auto racing track in New Castle known as Airport Speedway, which races on Saturday nights throughout the summer.