Weather right now
Asking the National Weather Service…
Where 73556 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 73556 into a pocket calculator and turn it upside down: gSSEL — not quite a word, sorry.
- ➕ As a number, 73,556 = 2 × 2 × 7 × 37 × 71. Its digits add up to 26, a total 2,038 other ZIP codes share.
- 💾In binary, the way a computer stores it:
10001111101010100 - 🏠 Its numerical neighbours: 73555 (Manitou, OK, 29 mi away) and 73557 (Medicine Park, OK, 50 mi away).
- 🔄 Backwards, 73556 becomes 65537, which is not a ZIP code at all.
- 👥 29 other ZIP codes are made of exactly the same digits (35576, 35756, 35765, 36575, 53576, 55367, …). The farthest-flung twin is 56735 in Lancaster, MN, 990 miles away.
- 🧭 Farther south than 75% of all ZIP codes, and farther west than 79%.
- 🎯355 miles south of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 73556 and you would come out at 34.73°S, 80.61°E — 1,140 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
- ☀Longest day of the year: 14h 29m of daylight. Shortest: 9h 49m.
- 📏 At 0.252 square miles of land, 73556 is bigger than 3% of ZIP codes — about 122 football fields.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 134This ZIP134 |
|---|---|
| Households | 49This ZIP49 |
| Housing units | 75This ZIP75 |
| Median age | 44.7This ZIP44.7Oklahoma37.0US 38.9 |
| Median household income | $64,375This ZIP$64,375Oklahoma$65,039US $80,734 |
| Median home value | $107,100This ZIP$107,100Oklahoma$199,800US $332,700 |
| Median gross rent | $625This ZIP$625Oklahoma$1,014US $1,413 |
| Bachelor's degree or higher | 12.5%This ZIP12.5% |
| Mean commute | 16.3 minThis ZIP16.3 min |
| Population density | 531.7 / sq miThis ZIP531.7 / sq mi |
Land area
| Land area | 0.25 sq miThis ZIP0.25 sq mi |
|---|---|
| Water area | 0.00 sq mi |
Other place names in 73556
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 73556
| ZIP | City | Distance |
|---|---|---|
73522 | Altus, OK | 6.8 mi |
73521 | Altus, OK | 7.5 mi |
73523 | Altus Afb, OK | 7.6 mi |
73526 | Blair, OK | 8.3 mi |
73560 | Olustee, OK | 12.9 mi |
73532 | Duke, OK | 13.3 mi |
73549 | Headrick, OK | 14.4 mi |
73554 | Mangum, OK | 14.9 mi |
73547 | Granite, OK | 17.2 mi |
73655 | Lone Wolf, OK | 19.2 mi |
Find every ZIP code within 10 miles of 73556 →
Questions about this ZIP code
Where is ZIP code 73556?
73556 is in Martha, Oklahoma, in Jackson County, part of the Altus, OK micropolitan area. Its published point location is 34.7260, -99.3867.
What county is 73556 in?
73556 lies in Jackson County.
What area code is 73556?
Martha uses area code 580, from NANPA's telephone records.
What time zone is 73556 in?
73556 uses America/Chicago.
How many people live in 73556?
About 134 people live in ZIP code 73556, in 49 households, at 531.7 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 73556?
$64,375 a year, against $65,039 across Oklahoma.
What ZIP codes are near 73556?
The closest are 73522 (6.8 mi), 73521 (7.5 mi), 73523 (7.6 mi), 73526 (8.3 mi) and 73560 (12.9 mi).
Is 73556 a PO Box ZIP code?
73556 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “73556 ZIP Code — Martha, Oklahoma (Jackson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/73556
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/73556.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.