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/IL/COUNTY/WASHINGTON

Washington County, IL ZIP codes

There are 10 ZIP codes in Washington County, IL, in 10 towns, from 62214 to 62877. The largest are 62263 (Nashville), 62271 (Okawville) and 62808 (Ashley). 1 more crosses into it from a neighbouring county: 62257.

The county seat is Nashville.

ZIP codes
10
Partly in it
1 more
Towns
10
County seat
Nashville
County FIPS
17189
Population
13,627
Median household income
$78,224
Land area
563 sq mi

Washington County ZIP codes by town

Nashville (county seat)
62263

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 Washington County

This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Washington County.

Map of Washington County ZIP codes

62214622636226862271628036280862831628486287662877

The ZIP codes of Washington 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.

Washington County in numbers

About 13,627 people live in Washington County, in 5,795 households, the 76th most populous of Illinois's 102 counties. The median household income is $78,224 a year, 6% below the Illinois median of $83,390 (US: $80,734). The median owner-occupied home is valued at $155,700 (41% below the Illinois median), and median gross rent is $818 a month. The median age is 44.2; 23.5% of adults 25 and over hold a bachelor's degree or higher (37.8% across Illinois); the average commute takes 27 minutes.

Population13,627Washington13,627
Households5,795Washington5,795
Median age44.2Washington44.2Illinois39.0US 38.9
Median household income$78,224Washington$78,224Illinois$83,390US $80,734
Median home value$155,700Washington$155,700Illinois$263,300US $332,700
Median gross rent$818Washington$818Illinois$1,274US $1,413
Bachelor's degree or higher23.5%Washington23.5%Illinois37.8%US 35.7%
Mean commute26.7 minWashington26.7 minIllinois27.8 minUS 26.4 min
Population density24 / sq miWashington24 / 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 Washington County

Largest towns in Washington County
TownZIP codesPopulation
Nashville 1 2,940
Okawville 1 1,299
Irvington 1 774
Hoyleton 1 523
Ashley 1 412
Addieville 1 294
Oakdale 1 264
Richview 1 208
Radom 1 146
Du Bois 1 122

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 Washington County.

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

Every ZIP code in Washington County, with figures

ZIP codes in Washington County
ZIP City Type Population Median income Median home
62214 Addieville , IL Standard 1,048 $104,063 $169,100
62263 Nashville , IL Standard 4,819 $71,690 $164,900
62268 Oakdale , IL Standard 764 $95,833 $151,200
62271 Okawville , IL Standard 1,873 $82,746 $163,700
62803 Hoyleton , IL Standard 1,132 $81,823 $118,800
62808 Ashley , IL Standard 1,602 $69,015 $146,600
62831 Du Bois , IL Standard 339 $79,464 $141,700
62848 Irvington , IL Standard 738 $80,156 $93,600
62876 Radom , IL Standard 146 $55,833 $105,400
62877 Richview , IL Standard 437 $83,958 $125,900

Cite this page

zipcodes.pro. “Washington County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/il/county/washington

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