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Washington ZIP Code Demographics
Washington is home to an estimated 7,816,116 people across 3,064,820 households. This page summarizes the state and profiles its 2 largest ZIP Code Tabulation Areas (ZCTAs) in depth.
Statewide, the median household income in Washington is $98,141 — 21.6% higher than the national median of $80,734 — and per-capita income is $53,744 versus $44,673 nationally. The median age is 38.3 years (national: 38.9), and 39.6% of adults age 25 and over hold a bachelor's degree or higher (national: 35.7%). Housing runs to a median home value of $564,600 and a median gross rent of $1,760, against national figures of $332,700 and $1,413.
Those state averages hide wide internal variation, which is exactly why this site works at ZIP level. In Washington, the profiled ZCTAs below range from 80,717 to 87,044 residents, and their median household incomes run from $87,951 to $163,460. A state figure is a useful benchmark; the ZIP-level profile is where the local story actually is. Each profile compares its ZCTA with these same state and national benchmarks so the contrast is explicit rather than implied.
The Largest Profiled ZIP Codes in Washington
| # | ZIP (ZCTA) | Main county | Population | Median HH income | |
|---|---|---|---|---|---|
| 1 | ZIP 99301 | Franklin County | 87,044 | $87,951 | |
| 2 | ZIP 98052 | King County | 80,717 | $163,460 |
Rankings use total population from the American Community Survey (ACS) 2020–2024 5-year estimates. A ZCTA is the Census Bureau's statistical approximation of a ZIP Code, built from census blocks; it is not an exact USPS delivery boundary. ZCTAs are assigned to the state containing the largest share of their land area in the Census Bureau's ZCTA-to-county relationship file, so a ZCTA near a state line appears under its main state even though a small part may cross into a neighbor.
How Washington Compares With the United States
On race and ethnicity, residents of Washington who identify as Hispanic or Latino make up 14.4% of the population, versus 19.3% nationally. The White-alone share is 65.8% (national: 61.0%), the Black or African American alone share is 4.0% (national: 12.2%), and the Asian-alone share is 9.8% (national: 6.0%). On work, 60.3% of Washington residents age 16 and over are employed, with an unemployment rate of 5.1% among the civilian labor force, versus 59.7% and 5.2% nationally. Because these are five-year averages for 2020–2024, they smooth the pandemic-era swing and describe the period as a whole.
To use this page well, start with the table: open the profile for any ZIP you care about, note its median income, home value and degree share, then come back here to see whether it sits above or below the state pattern. ZIP areas that beat the state on income but trail it on home value are often renter-heavy or newly built; areas with the reverse pattern are often older, owner-heavy communities. The profiles explain their own numbers in those terms, with the full demographic table on every page.
Frequently Asked Questions
What is the largest ZIP code in Washington?
Among the ZIP Code Tabulation Areas profiled on this site, ZIP 99301 is the largest in Washington with an estimated population of 87,044 (ACS 2020-2024 5-year estimates).
What is the median household income in Washington?
The median household income in Washington is $98,141, compared with $80,734 nationally.
How many ZIP codes does Washington have?
The Census Bureau publishes ACS data for 605 ZCTAs whose areas fall mainly in Washington; this page profiles the 2 largest of them in depth.
Data: U.S. Census Bureau, American Community Survey (ACS) 2020–2024 5-year estimates, retrieved October 2026. Source files and table numbers are listed on our methodology page; the underlying data is published at census.gov.