The northeast portion of this community was annexed by Arlington in 1999.
A small portion was annexed to the city of Bothell.
After the last portions of the town were annexed, it officially ceased to exist in 1955.
The western portions of the city were annexed from those two entities beginning in the 1930s.
The remaining northern portions of the district were annexed in 1911 and 1927.
Another portion of Middle Township was annexed in 1910.
Since 1983, portions of the community planning area have been annexed into the city of Hillsboro.
A portion of the borough was annexed by Alpine in 1904.
A portion of Bath, to the south, was annexed in 1897.
The area has gradually been reduced in size as portions of it were annexed by surrounding incorporated townships.
