21105
ZIP 21105 is Maryland Line, Maryland, in Baltimore County; area codes 443, 667 and 410; Eastern time.
- Type
- Standard
- Time zone
- America/New_York
- County
- Baltimore
- Metro area
- Baltimore-Columbia-Towson, MD
- Population
- 36
- Coordinates
- 39.7151, -76.6523
Weather right now
Asking the National Weather Service…
Where 21105 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 21105 into a pocket calculator and turn it upside down: SOIIZ — not quite a word, sorry.
- ➕ As a number, 21,105 = 3 × 3 × 5 × 7 × 67. Its digits add up to 9, a total 375 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101001001110001 - 🏠 Its numerical neighbours: 21104 (Marriottsville, MD, 29 mi away) and 21106 (Mayo, MD, 58 mi away).
- 🔄 Backwards, 21105 becomes 50112 — and that is a real ZIP code: Grinnell, IA, 851 miles away.
- 👥 37 other ZIP codes are made of exactly the same digits (01152, 01521, 02115, 02151, 10125, 10152, …). The farthest-flung twin is 51102 in Sioux City, IA, 1,039 miles away.
- 🧭 Farther north than 54% of all ZIP codes, and farther east than 83%.
- 🎯1,162 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21105 and you would come out at 39.72°S, 103.35°E — 881 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 21m.
- 📏 At 0.086 square miles of land, 21105 is bigger than 1% of ZIP codes — about 42 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 36This ZIP36 |
|---|---|
| Households | 14This ZIP14 |
| Housing units | 14This ZIP14 |
| Bachelor's degree or higher | 38.9%This ZIP38.9% |
| Population density | 418.6 / sq miThis ZIP418.6 / sq mi |
Business and tax activity
| Business establishments | 9This ZIP9 |
|---|---|
| Employees | 61This ZIP61 |
| Annual payroll | $3,504,000This ZIP$3,504,000 |
Land area
| Land area | 0.09 sq miThis ZIP0.09 sq mi |
|---|---|
| Water area | 0.00 sq mi |
ZIP codes near 21105
| ZIP | City | Distance |
|---|---|---|
17349 | New Freedom, PA | 2.1 mi |
21053 | Freeland, MD | 3.6 mi |
17361 | Shrewsbury, PA | 3.8 mi |
17355 | Railroad, PA | 3.9 mi |
21120 | Parkton, MD | 4.9 mi |
17363 | Stewartstown, PA | 5.1 mi |
21161 | White Hall, MD | 6.0 mi |
17327 | Glen Rock, PA | 7.0 mi |
17352 | New Park, PA | 8.7 mi |
17342 | Loganville, PA | 10.0 mi |
Find every ZIP code within 10 miles of 21105 →
Questions about this ZIP code
Where is ZIP code 21105?
21105 is in Maryland Line, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.7151, -76.6523.
What county is 21105 in?
21105 lies in Baltimore County.
What area code is 21105?
Maryland Line uses area codes 443, 667 and 410, from NANPA's telephone records.
What time zone is 21105 in?
21105 uses America/New_York.
How many people live in 21105?
About 36 people live in ZIP code 21105, in 14 households, at 418.6 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.
What ZIP codes are near 21105?
The closest are 17349 (2.1 mi), 21053 (3.6 mi), 17361 (3.8 mi), 17355 (3.9 mi) and 21120 (4.9 mi).
Is 21105 a PO Box ZIP code?
21105 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21105 ZIP Code — Maryland Line, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21105
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21105.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.