October 1903
    The Presbytery of Puget Sound asked the Rev. Robert Cooper to establish a church near Greenlake in Seattle.  There were four families from First United Presbyterian Church living in the vicinity and no churches nearby.  Lots were purchased at North 75th Street and Orin Court for the establishment of a new church.
March 4, 1904
    The Presbytery commissioned Dr. W. A. Spaulding and the Session of First United Presbyterian Church to effect an organization to be known as the Olympic Court United Presbyterian Church, with Rev. Robert E. Cooper as pastor.  Its membership of 18 persons consisted of five families, the Johnstones, John Clarks, William Clarks, the Besses, and the Blairs.
    Services were held in a tent put up on a wood frame until the new building, a "Swiss Cottage" church was built by the firm of Bliss, Brown, and Wilken at 7514 Orin Court. It took 18 months and cost $2613.  The church had a sanctuary, Sunday School room, and primary department on the first floor and a classroom and utilities in the basement.
    On Sunday, November 6, 1904, Dr. W. A. Spaulding preached the dedicatory sermon. Later, a parsonage was built and the church was enlarged and remodeled several times. (This original building still exists along with the bell tower and bell in it.  It is now a private home.)
1933
    The church's name was changed to Green Lake Presbyterian Church.
June 8, 1951
    The congregation initiated a movement to relocate the church. This proposal receive careful consideration. Several of the church families lived north of the church in an area called Parkwood, between North 155th and North 185th Streets and east of Aurora Avenue.  The pastor at the time, Rev. Barnes found a two-acre site at North 160th St and Stone Ave that could be purchased for $6,800.  There were no churches in the immediate vicinity and no Presbyterian churches within miles.
October 2, 1951
    A contract was signed with Mr. Turner, architect, to make plans for a new church, and at the congregational meeting held on January 18, 1952, the name "Trinity" was chosen for the church.
December 7, 1952
    The last worship service was held at the Greenlake church building. The first service in the new location was held December 14, 1952. The new church building was dedicated January 11, 1953.
December 10, 1961
    A new landmark was reached in the life of the church when ground was broken for a new, larger sanctuary and fellowship hall.
December 25, 1962
    On Christmas morning, December 25, 1962 there were 550 people crowded into the two services that inaugurated the worship services in the new sanctuary which continues in use.

In the years since, there have been numerous upgrades and improvements made to the building and its grounds. The congregation continues to serve God and share his love in this location. While the people and pastors may change over the years, the name of our church reminds us that the Trinity (God the Father, the Son, and the Holy Spirit) never changes.