Which New Castle are you looking at?
New Castle, DE 19720 is not one place. The incorporated city of New Castle covers 3.48 square miles and about 5,726 residents, per U.S. Census Bureau QuickFacts. ZIP code 19720 wraps around it and covers 38.3 square miles, more than ten times the land, with roughly 62,392 residents spanning Wilmington Manor, Minquadale, part of St. Georges, and other unincorporated New Castle County communities that share a mailing address with the historic city and little else, according to Census Reporter’s ZCTA profile. A search for “New Castle 19720” routinely returns listings from all of it.
Dutch colonists under Peter Stuyvesant built Fort Casimir on this site in 1651, the origin point of the city, according to the National Park Service. That is one sentence of history and no more; the question in front of a buyer today is current, not colonial.
Is New Castle, DE the same as ZIP code 19720? No. The city is a 3.48-square-mile incorporated municipality of about 5,726 people. ZIP 19720 is a much larger postal area of about 62,392 people that includes the city plus several unincorporated communities.
Getting there
New Castle sits about 10 minutes south of downtown Wilmington, with direct access from I-95 and I-295. Philadelphia is roughly 35 miles north. That proximity, not the historic core, is what actually drives most of the ZIP’s population and price levels.
Current market snapshot
Four figures below answer the same question four different ways.
| Geography | Metric | Figure | Source | As-of |
|---|---|---|---|---|
| New Castle city | Median home value (owner-estimated) | $285,100 | U.S. Census Bureau, ACS 2020-2024 | 2024 vintage |
| ZIP 19720 | Median home value (owner-estimated) | $265,000 | Census Reporter, ACS 2020-2024 | 2024 vintage |
| ZIP 19720 | Median sale price | $300,000 | Redfin | monthly snapshot |
| New Castle city | Median sale price | $402,000 | Redfin, 10 sales | single recent month |
New Castle city closed just 10 homes in the month behind that $402,000 figure, which is why it swung 54.6% against the same month a year earlier. That is a small-sample artifact more than a market signal, and it is the clearest reason a single “median home value in New Castle” means little without the sample size attached.
Why three sources show three different numbers
Two of the four figures above measure what owners report their home is worth in a five-year survey average. One measures what closed on the county’s much larger ZIP footprint. One measures what closed inside city limits on a sample too thin to trust from month to month. None of the four is wrong; each answers a different question about a different boundary.
Why do I see different “median home prices” for New Castle? Because sources disagree on two things at once: whether they mean the 3.48-square-mile city or the 38.3-square-mile ZIP, and whether they mean a self-reported survey estimate or an actual closed sale. Check both before comparing any number you find.
Historic District against the wider ZIP
| Area | Median sale price | Price per sq ft | Window |
|---|---|---|---|
| New Castle Historic District | $294,000 | $220 | trailing 3 months, 3 sales |
| ZIP 19720 overall | $300,000 | $212 | monthly snapshot |
| New Castle city overall | $402,000 | not published | single recent month |
Source: Redfin’s Historic District market page and the ZIP and city pages linked above. The district’s per-square-foot figure runs above the ZIP-wide number despite a lower headline price, consistent with smaller, older homes on tighter lots. A subdivision-by-subdivision MLS pull would sharpen this further; independently sourced data at that resolution was not available for this page, and no figure has been estimated to fill the gap.
Flood risk and what older housing stock means for financing
About 21% of properties in ZIP 19720 face severe flood risk within the next 30 years, per First Street Foundation’s modeling as reported through Redfin’s climate risk data, a factor none of the standard city or ZIP profiles for this area raise at all. The exposure sits unevenly: waterfront and low-lying parcels near the Delaware River carry it more heavily than inland tracts further into the ZIP. A flood determination affects whether a lender requires separate flood insurance, which changes monthly carrying cost independent of the mortgage rate itself.
New Castle’s Historic District is built substantially from 18th- and early 19th-century structures, per the National Park Service’s description of the district as one of the oldest continuously occupied riverfront communities in the region. Pre-1900 construction commonly draws closer inspection on old wiring, older plumbing, and foundation condition, and some conventional and FHA loans require repairs before closing if those surface. Confirm the specific inspection contingencies with a lender before writing an offer inside the historic core.
Rents and occupancy for investors
| Unit type | Average rent | Source date |
|---|---|---|
| 1-bedroom apartment | $1,364/mo | 6/27/2026 |
| 2-bedroom apartment | $1,494/mo | 6/27/2026 |
| Detached house | $1,900/mo | 6/27/2026 |
| All rental types blended | $1,623/mo | 6/27/2026 |
Source: Zumper rent research. Rent in New Castle runs roughly 17% below the national average, which matters against that same sub-$300,000 median sale price: a $300,000 acquisition against a $1,494 two-bedroom rent pencils out close to a 6% gross yield before taxes, insurance, and vacancy.
Is New Castle a good rental market for investors? The raw numbers favor cash flow over appreciation: sale prices sit below the metro median while two-bedroom rent averages $1,494 a month, but confirm the flood zone and property tax line for any specific parcel before running the numbers.
Property taxes: city limits versus unincorporated ZIP
| Jurisdiction | Residential rate | Applies to |
|---|---|---|
| Unincorporated New Castle County | $0.1575 per $100 assessed value | Most of ZIP 19720 outside city limits |
| New Castle County, incorporated-area rate | $0.0611 per $100 assessed value | City-limits residents (county portion) |
| City of New Castle municipal rate | $0.35635499 per $100 assessed value | City-limits residents (municipal add-on) |
Source: New Castle County’s FY2026 rate schedule and the City of New Castle’s FY2026 rate announcement. A city-limits owner pays both the lower incorporated county rate and the separate municipal rate on top of it; an unincorporated-ZIP owner pays only the single, higher county rate and no municipal tax at all. School district and light taxes apply on top of every row above.
Schools: address versus choice
Colonial School District serves 9,132 students across 14 schools, PK through 12, per GreatSchools’ district profile, and assignment follows home address in the ordinary way. Charter School of New Castle is a separate, smaller option, 764 students, kindergarten through 8th grade, and it is not tied to any address: seats are filled through Delaware’s statewide school-choice application, open to families anywhere in the state, according to the school’s own enrollment page, not reserved for a particular street range inside 19720. Private options, including parish and independent schools, round out a third path.
Is Charter School of New Castle guaranteed if I buy in the ZIP? No. It runs on Delaware’s statewide school-choice application, not a home-address boundary, so buying inside 19720 does not secure a seat; families anywhere in Delaware can apply.
What the safety data actually covers
Delaware’s Statistical Analysis Center publishes county-level crime figures only through 2023, per its Crime in Delaware series, and the most granular public reporting below that, Wilmington’s weekly CompStat program, does not extend to New Castle. A precise, current crime index specific to the city or to 19720 is not something the state actually publishes at that resolution, so treat any such figure with caution. New Castle County’s crime map is the closest thing to a live, address-level source, though it excludes several offense categories by policy.
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