Property Tax in New Castle County, Delaware
Homeowners in New Castle County, Delaware pay a median of $2,444 a year in real estate taxes, on a median home value of $329,800. Those are the Census Bureau's published medians for the county (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023) — the typical bill and the typical home value for owner-occupied households.
What the New Castle County numbers mean
Read the two medians together: $2,444 is the middle tax bill among owner-occupied households in New Castle County, and $329,800 is the middle home value. Neither figure describes a specific property — together they describe the typical homeowner's situation in the county.
The derived effective rate for New Castle County is 0.74% (median tax ÷ median value). Treat it as an estimate for comparison only: it comes from survey medians of different households, not from the county's rate schedule.
The key figures for New Castle County
| Measure | New Castle County |
|---|---|
| Median real estate taxes paid per year | $2,444 |
| Median home value | $329,800 |
| Derived effective rate* | 0.74% |
| Equivalent monthly tax | $204 |
| Tax per $100,000 of value (derived) | $741 |
| Illustrative tax on a $400,000 home (derived rate) | $2,964 |
For context, the Delaware medians are $1,731 of tax on $326,800 of value, and the US medians are $2,969 on $303,400. *Derived figures are estimates from Census medians, not official rates.
New Castle County at a glance
- Median tax rank in Delaware: #1 of 3 counties
- Median home value rank in Delaware: #2 of 3
- Population rank in Delaware: #1 of 3 (573,030 residents)
- Population density rank: #1 of 3 (1,344 people per square mile)
- Land area rank in Delaware: #3 of 3 (426 sq mi, 21.9% of the combined county land area)
- Median tax as a monthly figure: $204; per $1,000 of home value: $0.74
How New Castle County compares
The median tax bill in New Castle County is about 41% higher than the state median ($1,731 for Delaware) and about 18% lower than the US median ($2,969 nationally). By median taxes paid, the county ranks #1 out of 3 Delaware counties with published Census data — 0 counties in the state have a higher median bill.
Comparisons cut both ways: a county can have a modest rate but high bills because homes are expensive, or a high rate but modest bills because homes are cheaper. New Castle County's derived rate of 0.74% sits below the derived US figure of 0.98%.
Some extra context for New Castle County: the median bill works out to about $204 a month, and the derived rate equals roughly $741 of tax per $100,000 of home value. The county is home to 573,030 people — the #1 most populous county in Delaware, spread over 426 square miles, a density of about 1,344 people per square mile. Its median home value, $329,800, ranks #2 among the state's 3 counties with data.
Zooming out: of 3133 counties nationwide with published Census figures, only 726 record a higher median tax bill than New Castle County — it sits in the top 23% nationally. The county holds roughly 57.0% of Delaware's people. Its homes are worth more than the state norm (median $329,800 versus $326,800), and a decade at the derived rate of 0.74% adds up to about 7.41% of the median home's value in tax. The cheapest county in the state, Sussex County, medians $1,171 — $1,273 less than New Castle County per year.
Counties nearest New Castle County in the Delaware ranking
| County | Median tax paid | Median home value | Derived rate* |
|---|---|---|---|
| Kent County, DE | $1,331 | $290,600 | 0.46% |
| Sussex County, DE | $1,171 | $353,300 | 0.33% |
How the tax is worked out
Think of the final bill as three ingredients: the assessed value of the property, the exemptions subtracted from it, and the combined rate of every district the property sits in. New Castle County's medians imply a derived rate of 0.74%; applied illustratively, a $400,000 home would owe about $2,964 a year, or around $247 a month spread evenly. Individual properties depart from the illustration in both directions.
Checking your assessment in New Castle County
Believe your assessment is too high? The practical order of attack is: obtain your record card and audit it line by line; collect comparable recent sales in New Castle County; ask the assessor's office to correct anything plainly wrong; and, if the value still seems off, lodge a formal appeal ahead of the deadline printed on your assessment notice. Windows are short — often 30 to 90 days — and late appeals are usually rejected outright, however strong the case.
Similar-sized counties
Frequently asked questions
What is the median property tax in New Castle County, Delaware?
The median real estate tax paid in New Castle County, Delaware is $2,444 per year, on a median home value of $329,800 (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023).
What is the effective property tax rate in New Castle County, Delaware?
Dividing New Castle County's median tax bill ($2,444) by its median home value ($329,800) gives a derived effective rate of 0.74%. This is an estimate computed from two Census survey medians — it is not the county's official tax rate.
How does New Castle County compare with the rest of Delaware?
New Castle County ranks #1 of 3 Delaware counties with published data by median taxes paid. Its median bill of $2,444 is about 41% higher than the Delaware median of $1,731.
How are property taxes calculated in New Castle County, Delaware?
The assessor estimates your property's market value; exemptions (such as a homestead exemption) reduce the taxable amount; and the result is multiplied by the combined rates of the local taxing districts — county, municipality, school district and any special districts. In New Castle County, the median outcome of that process is a bill of $2,444 on a median home value of $329,800.
Can I appeal my property tax assessment in New Castle County, Delaware?
Yes — appeals are handled locally. Start with the New Castle County assessor's property record card for your home, correct any factual errors, and back your case with comparable recent sales. Formal appeals go to the review board named on your assessment notice and must be filed by its deadline, typically within 30 to 90 days.