The cities of Burien, SeaTac, Seattle and Tukwila have designated all or a portion of North Highline as a potential annexation area in their respective comprehensive plans. As a result, the Growth Management Planning Council (GMPC) has adopted a motion to show North Highline as an overlap or contested interim potential annexation area in the Countywide Planning Policies (CPPs). The CPPs are being amended to identify a process to resolve Potential Annexation Area (PAA) overlaps in the North Highline PAA.

Use the map and search function below to determine whether an address falls within this PAA and/or within an active annexation area. The map controls allow you to zoom-in to see street names and other neighborhood features. The search function will place a star on the map if the address searched is within a PAA.

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North Highline is an unincorporated urban area of approximately 32,000 bordered by Seattle, Burien, SeaTac and Tukwila. It includes the White Center and Boulevard Park communities, as well as, several other smaller neighborhoods.

Status updates

Both the Cities of Seattle and Burien claimed the North Highline Potential Annexation Area (PAA) as their potential annexation area. Since that time, proposed annexation area boundaries have been set within the PAA. The PAA was split into two areas, with the northern portion of the PAA named “Area Y” and the southern portion of the PAA named “Area X”. On December 4, 2008, King County, the cities of Burien and Seattle, and Fire Districts 2 and 11 in King County agreed on a memorandum of understanding between their service delivery jurisdictions in North Highline which detailed how jurisdictions will proceed regarding annexation attempts in the North Highline PAA.
The City of Burien successfully pursued annexation of the southern portion of the North Highline PAA, known as Area X. A ballot measure appeared on the August 2009 ballot asking residents of the southern portion of the North Highline PAA if they want to annex into the City of Burien. Residents approved the ballot measure with over 55% of the vote favoring annexation. On April 1, 2010, residents of Area X became a part of the City of Burien. More information on that effort can be found here:

City of Burien Annexation Information:

As of January 1, 2012 the City of Burien is currently working on a potential annexation of the northern portion of the North Highline PAA, called Area Y. More information on that effort can be found here:


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  Updated: April 11, 2012