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/MI/COUNTY/WASHTENAW

Washtenaw County, MI ZIP codes

There are 19 ZIP codes in Washtenaw County, MI, in 11 towns, from 48103 to 48198. The largest are 48197 (Ypsilanti), 48103 (Ann Arbor) and 48198 (Ypsilanti). 1 more crosses into it from a neighbouring county: 48160.

The county seat is Ann Arbor.

ZIP codes
19
Partly in it
1 more
Towns
11
County seat
Ann Arbor
County FIPS
26161
Population
369,822
Median household income
$89,180
Land area
706 sq mi
Area code
734
Metro area
Ann Arbor

Washtenaw County ZIP codes by town

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 Washtenaw County

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

Map of Washtenaw County ZIP codes

48103481044810548106481074810848109481134811548118481304815848175481764818948190481914819748198

The ZIP codes of Washtenaw 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.

Washtenaw County in numbers

About 369,822 people live in Washtenaw County, in 150,550 households, the 6th most populous of Michigan's 83 counties. The median household income is $89,180 a year, 22% above the Michigan median of $72,875 (US: $80,734). The median owner-occupied home is valued at $374,100 (62% above the Michigan median), and median gross rent is $1,463 a month. The median age is 35.0; 58.7% of adults 25 and over hold a bachelor's degree or higher (32.4% across Michigan); the average commute takes 24 minutes.

Population369,822Washtenaw369,822
Households150,550Washtenaw150,550
Median age35.0Washtenaw35.0Michigan40.2US 38.9
Median household income$89,180Washtenaw$89,180Michigan$72,875US $80,734
Median home value$374,100Washtenaw$374,100Michigan$231,600US $332,700
Median gross rent$1,463Washtenaw$1,463Michigan$1,129US $1,413
Bachelor's degree or higher58.7%Washtenaw58.7%Michigan32.4%US 35.7%
Mean commute23.5 minWashtenaw23.5 minMichigan24.2 minUS 26.4 min
Population density524 / sq miWashtenaw524 / 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 Washtenaw County

Largest towns in Washtenaw County
TownZIP codesPopulation
Ann Arbor 8 122,036
Ypsilanti 2 19,857
Saline 1 9,006
Whitmore Lake 1 7,878
Chelsea 1 5,426
Dexter 1 4,521
Willis 1 4,403
Manchester 1 2,522
Whittaker 1 76

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 Washtenaw County.

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

Every ZIP code in Washtenaw County, with figures

ZIP codes in Washtenaw County
ZIP City Type Population Median income Median home
48103 Ann Arbor , MI Standard 55,054 $116,194 $471,700
48104 Ann Arbor , MI Standard 43,979 $64,231 $491,200
48105 Ann Arbor , MI Standard 37,048 $94,774 $503,100
48106 Ann Arbor , MI No street area — — —
48107 Ann Arbor , MI No street area — — —
48108 Ann Arbor , MI Standard 27,666 $89,355 $406,700
48109 Ann Arbor , MI Standard 5,939 $14,093 —
48113 Ann Arbor , MI No street area — — —
48115 Bridgewater , MI No street area — — —
48118 Chelsea , MI Standard 13,246 $88,278 $357,200
48130 Dexter , MI Standard 16,986 $129,254 $480,500
48158 Manchester , MI Standard 7,770 $94,784 $312,200
48175 Salem , MI No street area — — —
48176 Saline , MI Standard 23,451 $114,206 $408,300
48189 Whitmore Lake , MI Standard 13,893 $87,145 $313,400
48190 Whittaker , MI Standard 76 $76,875 $218,800
48191 Willis , MI Standard 4,403 $102,833 $271,900
48197 Ypsilanti , MI Standard 66,525 $73,737 $294,500
48198 Ypsilanti , MI Standard 39,244 $63,326 $189,100

Cite this page

zipcodes.pro. “Washtenaw County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/mi/county/washtenaw

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