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/MO/COUNTY/OREGON

Oregon County, MO ZIP codes

Oregon County, MO has 5 ZIP codes, in 5 towns: 65791, 65606, 65692, 65778 and 65690. 3 more cross into it from neighbouring counties: 65438, 65588 and 63941.

The county seat is Alton.

ZIP codes
5
Partly in it
3 more
Towns
5
County seat
Alton
County FIPS
29149
Population
8,673
Median household income
$43,069
Land area
790 sq mi

Oregon County ZIP codes by town

Alton (county seat)
65606

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 Oregon County

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

Map of Oregon County ZIP codes

6560665690656926577865791

The ZIP codes of Oregon 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.

Oregon County in numbers

About 8,673 people live in Oregon County, in 3,380 households, the 93rd most populous of Missouri's 115 counties. The median household income is $43,069 a year, 39% below the Missouri median of $70,702 (US: $80,734). The median owner-occupied home is valued at $113,300 (51% below the Missouri median), and median gross rent is $639 a month. The median age is 44.5; 12.6% of adults 25 and over hold a bachelor's degree or higher (32.4% across Missouri); the average commute takes 23 minutes.

Population8,673Oregon8,673
Households3,380Oregon3,380
Median age44.5Oregon44.5Missouri39.0US 38.9
Median household income$43,069Oregon$43,069Missouri$70,702US $80,734
Median home value$113,300Oregon$113,300Missouri$230,300US $332,700
Median gross rent$639Oregon$639Missouri$1,033US $1,413
Bachelor's degree or higher12.6%Oregon12.6%Missouri32.4%US 35.7%
Mean commute23.0 minOregon23.0 minMissouri23.5 minUS 26.4 min
Population density11 / sq miOregon11 / 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 Oregon County

Largest towns in Oregon County
TownZIP codesPopulation
Thayer 1 2,333
Alton 1 744
Myrtle 1 430
Koshkonong 1 198
Couch 1 130

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 Oregon County.

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

Every ZIP code in Oregon County, with figures

ZIP codes in Oregon County
ZIP City Type Population Median income Median home
65606 Alton , MO Standard 2,381 $51,909 $118,800
65690 Couch , MO Standard 130 — $203,300
65692 Koshkonong , MO Standard 1,068 $40,357 $143,800
65778 Myrtle , MO Standard 430 $23,669 $156,900
65791 Thayer , MO Standard 4,425 $42,470 $100,500

Cite this page

zipcodes.pro. “Oregon County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/mo/county/oregon

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