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Where 21636 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 21636 into a pocket calculator and turn it upside down: gEgIZ — not quite a word, sorry.
- ➕ As a number, 21,636 = 2 × 2 × 3 × 3 × 601. Its digits add up to 18, a total 2,332 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010010000100 - 🏠 Its numerical neighbours: 21635 (Galena, MD, 22 mi away) and 21638 (Grasonville, MD, 23 mi away).
- 🔄 Backwards, 21636 becomes 63612, which is not a ZIP code at all.
- 👥 27 other ZIP codes are made of exactly the same digits (13626, 13662, 16236, 16263, 16326, 16362, …). The farthest-flung twin is 66213 in Overland Park, KS, 1,014 miles away.
- 🧭 Farther south than 50% of all ZIP codes, and farther east than 85%.
- 🎯1,214 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21636 and you would come out at 39.01°S, 104.20°E — 816 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 55m of daylight. Shortest: 9h 25m.
- 📏 At 23.5 square miles of land, 21636 is bigger than 41% of ZIP codes — room for about 18 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 1,097This ZIP1,097 |
|---|---|
| Households | 422This ZIP422 |
| Housing units | 433This ZIP433 |
| Median age | 44.0This ZIP44.0Maryland39.4US 38.9 |
| Median household income | $73,426This ZIP$73,426Maryland$103,678US $80,734 |
| Median home value | $320,000This ZIP$320,000Maryland$419,900US $332,700 |
| Median gross rent | $1,655This ZIP$1,655Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 8.0%This ZIP8.0% |
| Mean commute | 36.3 minThis ZIP36.3 min |
| Population density | 46.7 / sq miThis ZIP46.7 / sq mi |
Business and tax activity
| Business establishments | 10This ZIP10 |
|---|---|
| Employees | 102This ZIP102 |
| Annual payroll | $6,108,000This ZIP$6,108,000 |
| Tax returns filed | 560This ZIP560 |
| Total adjusted gross income | $33,158,000This ZIP$33,158,000 |
Land area
| Land area | 23.51 sq miThis ZIP23.51 sq mi |
|---|---|
| Water area | 0.06 sq miThis ZIP0.06 sq mi |
Other place names in 21636
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21636
| ZIP | City | Distance |
|---|---|---|
21640 | Henderson, MD | 3.9 mi |
21639 | Greensboro, MD | 4.0 mi |
21660 | Ridgely, MD | 6.4 mi |
19964 | Marydel, DE | 6.8 mi |
21644 | Ingleside, MD | 8.2 mi |
21670 | Templeville, MD | 8.5 mi |
21607 | Barclay, MD | 8.8 mi |
21649 | Marydel, MD | 9.0 mi |
19943 | Felton, DE | 10.2 mi |
19934 | Camden Wyoming, DE | 10.2 mi |
Find every ZIP code within 10 miles of 21636 →
Questions about this ZIP code
Where is ZIP code 21636?
21636 is in Goldsboro, Maryland, in Caroline County. Its published point location is 39.0150, -75.7958.
What county is 21636 in?
21636 lies in Caroline County.
What area code is 21636?
Goldsboro uses area codes 667 and 410, from NANPA's telephone records.
What time zone is 21636 in?
21636 uses America/New_York.
How many people live in 21636?
About 1,097 people live in ZIP code 21636, in 422 households, at 46.7 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 21636?
$73,426 a year, against $103,678 across Maryland.
What ZIP codes are near 21636?
The closest are 21640 (3.9 mi), 21639 (4 mi), 21660 (6.4 mi), 19964 (6.8 mi) and 21644 (8.2 mi).
Is 21636 a PO Box ZIP code?
21636 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21636 ZIP Code — Goldsboro, Maryland (Caroline County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21636
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21636.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.