Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/OK/COUNTY/HARMON

Harmon County, OK ZIP codes

Harmon County, OK has 3 ZIP codes, in 3 towns: 73550, 73544 and 73571. 2 more cross into it from neighbouring counties: 73554 and 73537.

The county seat is Hollis.

ZIP codes
3
Partly in it
2 more
Towns
3
County seat
Hollis
County FIPS
40057
Population
2,406
Median household income
$43,333
Land area
537 sq mi

Harmon County ZIP codes by town

Hollis (county seat)
73550

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

ZIP codes partly in Harmon County

These ZIP codes lie mostly in a neighbouring county but each cover a twentieth or more of Harmon County.

Map of Harmon County ZIP codes

735447355073571

The ZIP codes of Harmon County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Harmon County in numbers

About 2,406 people live in Harmon County, in 964 households, the 76th most populous of Oklahoma's 77 counties. The median household income is $43,333 a year, 33% below the Oklahoma median of $65,039 (US: $80,734). The median owner-occupied home is valued at $79,700 (60% below the Oklahoma median), and median gross rent is $694 a month. The median age is 40.3; 13.4% of adults 25 and over hold a bachelor's degree or higher (28.3% across Oklahoma); the average commute takes 18 minutes.

Population2,406Harmon2,406
Households964Harmon964
Median age40.3Harmon40.3Oklahoma37.0US 38.9
Median household income$43,333Harmon$43,333Oklahoma$65,039US $80,734
Median home value$79,700Harmon$79,700Oklahoma$199,800US $332,700
Median gross rent$694Harmon$694Oklahoma$1,014US $1,413
Bachelor's degree or higher13.4%Harmon13.4%Oklahoma28.3%US 35.7%
Mean commute18.2 minHarmon18.2 minOklahoma22.4 minUS 26.4 min
Population density4 / sq miHarmon4 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Harmon County

Largest towns in Harmon County
TownZIP codesPopulation
Hollis 1 1,664
Gould 1 62
Vinson 1 33

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Harmon County.

Not sure you are in Harmon County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Harmon County, with figures

ZIP codes in Harmon County
ZIP City Type Population Median income Median home
73544 Gould , OK Standard 178 $36,250 $64,300
73550 Hollis , OK Standard 2,179 $43,804 $80,200
73571 Vinson , OK Standard 33 $37,000 $161,100

Cite this page

zipcodes.pro. “Harmon County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ok/county/harmon

Underlying data is public domain or openly licensed — sources, vintages and licences.