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Where 12421 is
Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.
- 🔢 Type 12421 into a pocket calculator and turn it upside down: IZhZI — not quite a word, sorry.
- ⇆12421 reads the same backwards. It is one of only 412 palindromic ZIP codes.
- ➕ 12421 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 10, a total 513 other ZIP codes share.
- 💾In binary, the way a computer stores it:
11000010000101 - 🏠 Its numerical neighbours: 12420 (Cragsmoor, NY, 41 mi away) and 12422 (Durham, NY, 19 mi away).
- 👥 16 other ZIP codes are made of exactly the same digits (11224, 11242, 11422, 12124, 12214, 12241, …). The farthest-flung twin is 42211 in Cadiz, KY, 801 miles away.
- 🧭 Farther north than 77% of all ZIP codes, and farther east than 89%.
- 🎯1,260 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 12421 and you would come out at 42.26°S, 105.46°E — 912 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 15h 16m of daylight. Shortest: 9h 05m.
- 📏 At 17.2 square miles of land, 12421 is bigger than 35% of ZIP codes — room for about 13 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 261This ZIP261 |
|---|---|
| Households | 149This ZIP149 |
| Housing units | 363This ZIP363 |
| Median age | 70.3This ZIP70.3New York39.8US 38.9 |
| Median household income | $100,819This ZIP$100,819New York$85,974US $80,734 |
| Median home value | $372,200This ZIP$372,200New York$423,800US $332,700 |
| Bachelor's degree or higher | 44.8%This ZIP44.8% |
| Mean commute | 31.3 minThis ZIP31.3 min |
| Population density | 15.2 / sq miThis ZIP15.2 / sq mi |
Business and tax activity
| Business establishments | 7This ZIP7 |
|---|---|
| Employees | 12This ZIP12 |
| Annual payroll | $555,000This ZIP$555,000 |
| Tax returns filed | 210This ZIP210 |
| Total adjusted gross income | $20,879,000This ZIP$20,879,000 |
Land area
| Land area | 17.19 sq miThis ZIP17.19 sq mi |
|---|---|
| Water area | 0.01 sq miThis ZIP0.01 sq mi |
ZIP codes near 12421
| ZIP | City | Distance |
|---|---|---|
12474 | Roxbury, NY | 3.3 mi |
12430 | Fleischmanns, NY | 4.3 mi |
12438 | Halcottsville, NY | 4.7 mi |
12434 | Grand Gorge, NY | 7.4 mi |
12459 | New Kingston, NY | 7.4 mi |
12468 | Prattsville, NY | 7.5 mi |
12441 | Highmount, NY | 7.5 mi |
12465 | Pine Hill, NY | 7.9 mi |
13788 | Hobart, NY | 8.8 mi |
12452 | Lexington, NY | 9.1 mi |
Find every ZIP code within 10 miles of 12421 →
Questions about this ZIP code
Where is ZIP code 12421?
12421 is in Denver, New York, in Delaware County. Its published point location is 42.2571, -74.5352.
What county is 12421 in?
12421 lies in Delaware County.
What time zone is 12421 in?
12421 uses America/New_York.
How many people live in 12421?
About 261 people live in ZIP code 12421, in 149 households, at 15.2 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What is the median household income in 12421?
$100,819 a year, against $85,974 across New York.
What ZIP codes are near 12421?
The closest are 12474 (3.3 mi), 12430 (4.3 mi), 12438 (4.7 mi), 12434 (7.4 mi) and 12459 (7.4 mi).
Is 12421 a PO Box ZIP code?
12421 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “12421 ZIP Code — Denver, New York (Delaware County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/12421
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/12421.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.