2026 Property Tax Due Dates
September 30
Full payment
Payment Methods
Online, Mail, In-Person
New Castle County Treasurer
Phone
(302) 395-5340Office Hours
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to New Castle County Treasurer
In Person
Visit the Treasurer's office — 87 Reads Way, New Castle DE 19720, Mon-Fri 8am - 4pm
About New Castle County
New Castle County is the northernmost of the three counties of the U.S. state of Delaware (New Castle, Kent, and Sussex). As of the 2020 census, the population was 570,719, making it the most populous county in Delaware, with nearly 60% of the state's population of 989,948. The county seat is Wilmington, which is also the state's most populous city.
Source: Wikipedia — content available under CC BY-SA 4.0
Related Resources
Get Deadline Reminders
We'll email you a fortnight before your property taxes are due.
Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.