If you wonder where, you can buy a home with a rural development (USDA) loan, here’s a map. The area inside the outlined area is considered urban and is NOT eligible for rural development housing programs.
Hence, homes in Snohomish county located outside of the area outlined in the map should be geographically eligible for a USDA loan (see the official description of borders below).
The ineligible area of Snohomish County Washington includes all of the area South of 140th Street NW, West to Interstate 5. South on Interstate 5 to the water in Possession Sound at Port Gardner. Following the coastline South to the King County Line, East long the King County line to State Route 9. North on State Route 9 to 140th Street NW.
Source: WA INSTRUCTION HB-1-3550, Exhibit L (Snohomish County)