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Part 4: Trends and Forecasts — Chapter 4.1, Central Puget Sound Region Population

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The Sea-Tac Communities Plan
final plan

This document is Part 4 of a Master Plan study for Sea-Tac International Airport, focusing on trends and forecasts for the Central Puget Sound Region. It examines population and economic growth data to project future air traffic demand, noting that the four-county area around Seattle held over 1.9 million people in 1970—56% of Washington State's population. While the region grew rapidly through the 1950s and 1960s, the plan anticipates more modest growth in the 1970s relative to national averages.

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Notes

Part 4 of the Sea-Tac Communities Plan (STCP, 1976) covering trends and forecasts, specifically Chapter 4.1 on the Central Puget Sound Region. Section 4.1.1 analyzes population growth in the four-county area surrounding Puget Sound as the basis for projecting air traffic demand and future facility requirements at Sea-Tac International Airport. Documents 1970 population of 1,934,628 (56% of Washington State), historical growth rates of 2.4% annually in the 1950s, and regional population increase from 1,196,172 in 1950 to 1,512,979 in 1960. Discusses Seattle, Tacoma, Bellevue, Everett, Bremerton, and Renton as notable urban centers. Notes growth reversal in the 1970s and modest future projections relative to the U.S. national average.

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