ZIP codes
10
Washington County, MO Demographics & ZIP Codes
Washington County, Missouri demographics and median household income by ZIP code — 10 ZIP codes — population 21,692 — avg. income $55,582 — avg. home value $122,822. Compare income, housing, and ZIP-level data on US5.
Population
21,692
Median household income (avg.)
$55,582
74% of U.S. median
Average home value
$122,822
35% of U.S. median
Average rent
$507
44% of U.S. median
Washington County demographics
Washington County, Missouri covers 10 ZIP codes, with a combined ZIP-area population of about 21,692.
Median household income in Washington County
The average median household income across ZIP codes in Washington County, Missouri is about $55,582 — about 15% below the MO ZIP average ($65,505), and about 26% below the U.S. median ($75,149).
Among ZIPs with income data, 63626 is near the top at about $80,129, while 63648 (Irondale) is near the bottom at about $37,298.
Housing in Washington County
For housing in Washington County, Missouri, the average median home value is about $122,822 and the average median rent is about $507.
The most populous ZIP is 63664 (Potosi) with about 9,060 residents. Use the table below to compare ZIP codes across the county.
ZIP codes in Washington County
Sort by population, income, or home value. Click a column header to toggle ascending / descending.
| ZIP | City | County | State | Population ↓ | Income | Home value |
|---|---|---|---|---|---|---|
| 63664 | Potosi | Washington County | MO | 9,060 | $52,071 | $122,800 |
| 63630 | — | Washington County | MO | 3,765 | $50,896 | $111,600 |
| 63660 | Potosi | Washington County | MO | 3,489 | $55,981 | $101,300 |
| 63648 | Irondale | Washington County | MO | 1,483 | $37,298 | $93,600 |
| 63071 | — | Washington County | MO | 1,315 | $44,539 | $122,900 |
| 63622 | — | Washington County | MO | 782 | $48,065 | $105,000 |
| 63626 | — | Washington County | MO | 694 | $80,129 | $118,200 |
| 63631 | Caledonia | Washington County | MO | 687 | $72,344 | $138,100 |
| 63030 | — | Washington County | MO | 364 | $58,917 | $191,900 |
| 63674 | — | Washington County | MO | 53 | — | — |
Frequently asked questions
What are the demographics of Washington County?
Washington County, Missouri has a combined ZIP-area population of about 21,692 across 10 ZIP codes. Browse the ZIP table for population, income, and housing by code.
What is the median household income in Washington County?
The average median household income across ZIP codes in Washington County, Missouri is about $55,582, about 15% below the state ZIP average ($65,505), and about 26% below the U.S. median ($75,149). Average median home value is about $122,822. Among ZIPs with data, 63626 is near the top ($80,129) and 63648 (Irondale) is near the bottom ($37,298).
How many ZIP codes are in Washington County?
Washington County, Missouri includes 10 ZIP codes on US5. Each row links to demographics, median income, and housing for that code.
Where can I find ZIP code demographics for Washington County?
This page lists ZIP codes in Washington County, Missouri with population, median household income, and home value. Select a ZIP for a full demographics profile.