Washington · FIPS 53045 · County seat: Shelton
Mason County, WA GIS & Parcel Viewer
Use this page to reach the official county parcel map for Mason County, Washington. The button below opens the Mason County parcel map in a new tab, so you can look up parcels by address, owner or parcel number on the source site itself.
Open the Mason County parcel map ↗
Opens gis.masoncountywa.gov in a new tab. We link out and never embed or copy parcel data.
Mason County at a glance
| Official map | Mason County parcel map |
|---|---|
| Type | County-run map |
| Website | gis.masoncountywa.gov |
| Access | Free, no login (checked Oct 2026) |
| County seat | Shelton |
| Population | 68,389 (2023 Census Bureau estimate) |
| Land area | 960 sq mi |
| FIPS code | 53045 |
About the official source
It is a county-level map: Mason County or the company it hires keeps the parcel layer up to date. When we tested the link in October 2026 it opened with no login and no fee.
Finding a property on this map
- Open the official link in a new tab.
- Accept any disclaimer, then look for a search box that takes street addresses, owners or parcel IDs.
- Zoom in and click a parcel to see its details.
- Use the map's layer controls to add aerials or other layers if they're offered.
Many parcel sites expect owner names last name first. If a full name finds nothing, try just the surname.
The county in brief
Mason County had an estimated 68,389 residents in 2023, according to the Census Bureau. With about 960 square miles of land, that works out to roughly 71 people per square mile. Among Washington's 39 counties, it is the 20th largest by population. The county seat is Shelton.
Nearby parcel maps
Mason County shares a border with the counties below. Each link has its own official map:
Before you rely on the lines
Keep in mind that a GIS parcel layer is a tax map, not a survey. For exact boundaries, look at the recorded deed and plat or hire a licensed land surveyor.